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Flowtech

Flowtech Headers 11500FLT Headers, Long Tube, Steel, Painted, Chevy, GMC, Small Block, Pair

SKU: BIG11500FLT

Headers
Flowtech Headers 11500FLT Headers, Long Tube, Steel, Painted, Chevy, GMC, Small Block, Pair

Flowtech

Flowtech Headers 11500FLT Headers, Long Tube, Steel, Painted, Chevy, GMC, Small Block, Pair

SKU: BIG11500FLT

Headers

Sale ends in Calculating...

A$869.25 A$895.63
IN STOCK! Est Ship 4-7 days. This item is IN STOCK at one of our warehouses or distribution centres, the ETA is the approximate time required to prepare your order for dispatch.
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Description

These Flowtech headers fit small block Chevy engines for for Chevy and GMC 1966-91 model year vehicles. These long-tube (or full-length) headers are steel constructed and are come with a painted finish. All tubing is mandrel-bent to provide consistent tubing diameter for smooth flow and increased exhaust velocity. Extra-thick, machined header flanges provide a leak-free seal and maximum strength. All mounting hardware and premium gaskets are included.

Depending on application, features may include:

* Leakproof O-ringed port seals on select headers
* Available to work with factory power steering and power brakes
* Where applicable, welded-in collector merge spears control exhaust gas re-entry into primary tubes

Important notes: Breaking in an engine with ceramic coated headers WILL result in damage to the coating and will VOID all warranties. Ceramic coated headers require several heat cycles to fully cure before they will withstand extreme heat. Hooker recommends using cast iron exhaust manifolds or old headers to break in new engines to avoid coating damage. Flowtech does not recommend the use of header wraps as this will void the warranty.

Part Type

SBC Universal Truck Headers 2wd/4wd

Data: v4.2 - Upd: 2026-10-14 09:07:57

Specifications

Product Attributes - Brand
Flowtech
Product Attributes - Manufacturer's Part Number
11500FLT
Product Attributes - Part Type
Headers
Product Attributes - Product Line
Flowtech Headers
Product Attributes - UPC
787480115003
Product Attributes - Header Style
Long tube one-piece
Product Attributes - Header Material
Steel
Product Attributes - Primary Tube Outside Diameter (in.)
1 1/2 in.
Product Attributes - Header Color
Temporary non-high temperature paint
Product Attributes - Flange Style
Standard
Product Attributes - Weld-Up
No
Product Attributes - Collector Attachment
3-bolt flange
Product Attributes - Collector Diameter (in.)
3.00
Product Attributes - Collector Reducers Included
Yes
Product Attributes - Collector Reducer Exit Diameter
2.500 in.
Product Attributes - Tuned
No
Product Attributes - Primary Tube Gauge
18-gauge
Product Attributes - Spark Plug Position
Straight
Product Attributes - Flange Thickness (in.)
0.31 in.
Product Attributes - Bolts/Studs Included
Yes
Product Attributes - Gaskets Included
Yes
Product Attributes - Crossover Pipe Included
No
Product Attributes - Catalytic Converter(s) Included
No
Product Attributes - Motor Mounts Included
No
Product Attributes - Transmission Mount Included
No
Product Attributes - Quantity
Sold as a pair.
Product Attributes - Notes
The paint applied to these headers is a temporary coating only and is designed to burn off during use. High temperature paint or other high temperature coatings are recommended.

Reference Information

Brand Name/s Flowtech
StreetFX SKU big11500FLT
SFX Item ID 5092158
Supplier Item Code 5092158
Manufacturer SKU 11500FLT
Manufacturer UPC 787480115003
Alternative References FLT11500

Compatibility

Application Data
  • MakeGMC
    ModelK25/K2500 PICKUP
    SubmodelBASE
    Beginning Year1970
    Ending Year1968
    Engine TypeV8
    Engine FamilyChevy small block Gen I
    Engine Size5.3L/327
    DrivetrainRWD
    Power SteeringYes
    Power Brakes (application)Yes
    Air ConditioningYes
    Standard Transmission Column ShiftNo
    Standard Transmission Floor ShiftYes
    Automatic Transmission Column ShiftYes
    Automatic Transmission Floor ShiftYes
    Footnotes1 - Also available with A.I.R. injection manifold welded in place. Add suffix "S" to the part number when ordering (Not available with ceramic finish headers). 3 - Must modify stock exhaust to retain catalytic converters. 6 - Applications with oxygen sensor use reducer BIG-10105 for 2-1/2 in. 3-bolt flange or BIG-10110 for 3 in. 3-bolt flange. 21 - On 1983-84 4WD it is necessary to remove the rubber stopper below the starter. 23 - Installation requires Flowtech air conditioning bracket BIG-10042. 1979 and later vehicles equipped with short compressor, use original bracket. 58 - Will not fit angle plug heads.
  • MakeGMC
    ModelK25/K2500 PICKUP
    SubmodelBASE
    Beginning Year1970
    Ending Year1974
    Engine TypeV8
    Engine FamilyChevy small block Gen I
    Engine Size5.7L/350
    Drivetrain4WD
    Power SteeringYes
    Power Brakes (application)Yes
    Air ConditioningYes
    Standard Transmission Column ShiftNo
    Standard Transmission Floor ShiftYes
    Automatic Transmission Column ShiftYes
    Automatic Transmission Floor ShiftYes
    Footnotes1 - Also available with A.I.R. injection manifold welded in place. Add suffix "S" to the part number when ordering (Not available with ceramic finish headers). 23 - Installation requires Flowtech air conditioning bracket BIG-10042. 1979 and later vehicles equipped with short compressor, use original bracket. 32 - Pre-1970 vehicles with exhaust manifold mounted Alternator/Generator use bracket BIG-10031. 42 - May require clutch linkage modifications. 58 - Will not fit angle plug heads.
  • MakeGMC
    ModelK25/K2500 PICKUP
    SubmodelBASE
    Beginning Year1970
    Ending Year1969
    Engine TypeV8
    Engine FamilyChevy small block Gen I
    Engine Size5.3L/327
    DrivetrainRWD
    Power SteeringYes
    Power Brakes (application)Yes
    Air ConditioningYes
    Standard Transmission Column ShiftNo
    Standard Transmission Floor ShiftYes
    Automatic Transmission Column ShiftYes
    Automatic Transmission Floor ShiftYes
    Footnotes1 - Also available with A.I.R. injection manifold welded in place. Add suffix "S" to the part number when ordering (Not available with ceramic finish headers). 23 - Installation requires Flowtech air conditioning bracket BIG-10042. 1979 and later vehicles equipped with short compressor, use original bracket. 32 - Pre-1970 vehicles with exhaust manifold mounted Alternator/Generator use bracket BIG-10031. 42 - May require clutch linkage modifications. 58 - Will not fit angle plug heads.
  • MakeGMC
    ModelK25/K2500 PICKUP
    SubmodelBASE
    Beginning Year1970
    Ending Year1969
    Engine TypeV8
    Engine FamilyChevy small block Gen I
    Engine Size5.3L/327
    Drivetrain4WD
    Power SteeringYes
    Power Brakes (application)Yes
    Air ConditioningYes
    Standard Transmission Column ShiftNo
    Standard Transmission Floor ShiftYes
    Automatic Transmission Column ShiftYes
    Automatic Transmission Floor ShiftYes
    Footnotes1 - Also available with A.I.R. injection manifold welded in place. Add suffix "S" to the part number when ordering (Not available with ceramic finish headers). 3 - Must modify stock exhaust to retain catalytic converters. 6 - Applications with oxygen sensor use reducer BIG-10105 for 2-1/2 in. 3-bolt flange or BIG-10110 for 3 in. 3-bolt flange. 21 - On 1983-84 4WD it is necessary to remove the rubber stopper below the starter. 23 - Installation requires Flowtech air conditioning bracket BIG-10042. 1979 and later vehicles equipped with short compressor, use original bracket. 58 - Will not fit angle plug heads.
  • MakeGMC
    ModelK25/K2500 PICKUP
    SubmodelBASE
    Beginning Year1970
    Ending Year1974
    Engine TypeV8
    Engine FamilyChevy small block Gen I
    Engine Size5.7L/350
    DrivetrainRWD
    Power SteeringYes
    Power Brakes (application)Yes
    Air ConditioningYes
    Standard Transmission Column ShiftYes
    Standard Transmission Floor ShiftYes
    Automatic Transmission Column ShiftYes
    Automatic Transmission Floor ShiftYes
    Footnotes1 - Also available with A.I.R. injection manifold welded in place. Add suffix "S" to the part number when ordering (Not available with ceramic finish headers). 3 - Must modify stock exhaust to retain catalytic converters. 23 - Installation requires Flowtech air conditioning bracket BIG-10042. 1979 and later vehicles equipped with short compressor, use original bracket. 42 - May require clutch linkage modifications. 58 - Will not fit angle plug heads.
  • MakeGMC
    ModelK25/K2500 SUBURBAN
    SubmodelBASE
    Beginning Year1970
    Ending Year1968
    Engine TypeV8
    Engine FamilyChevy small block Gen I
    Engine Size5.3L/327
    DrivetrainRWD
    Power SteeringYes
    Power Brakes (application)Yes
    Air ConditioningYes
    Standard Transmission Column ShiftYes
    Standard Transmission Floor ShiftYes
    Automatic Transmission Column ShiftYes
    Automatic Transmission Floor ShiftNo
    Footnotes1 - Also available with A.I.R. injection manifold welded in place. Add suffix "S" to the part number when ordering (Not available with ceramic finish headers). 23 - Installation requires Flowtech air conditioning bracket BIG-10042. 1979 and later vehicles equipped with short compressor, use original bracket. 32 - Pre-1970 vehicles with exhaust manifold mounted Alternator/Generator use bracket BIG-10031. 42 - May require clutch linkage modifications. 58 - Will not fit angle plug heads.
  • MakeGMC
    ModelK25/K2500 SUBURBAN
    SubmodelBASE
    Beginning Year1970
    Ending Year1968
    Engine TypeV8
    Engine FamilyChevy small block Gen I
    Engine Size5.3L/327
    Drivetrain4WD
    Power SteeringYes
    Power Brakes (application)Yes
    Air ConditioningYes
    Standard Transmission Column ShiftYes
    Standard Transmission Floor ShiftYes
    Automatic Transmission Column ShiftYes
    Automatic Transmission Floor ShiftYes
    Footnotes1 - Also available with A.I.R. injection manifold welded in place. Add suffix "S" to the part number when ordering (Not available with ceramic finish headers). 3 - Must modify stock exhaust to retain catalytic converters. 23 - Installation requires Flowtech air conditioning bracket BIG-10042. 1979 and later vehicles equipped with short compressor, use original bracket. 32 - Pre-1970 vehicles with exhaust manifold mounted Alternator/Generator use bracket BIG-10031. 42 - May require clutch linkage modifications. 58 - Will not fit angle plug heads.
  • MakeGMC
    ModelK25/K2500 SUBURBAN
    SubmodelBASE
    Beginning Year1970
    Ending Year1968
    Engine TypeV8
    Engine FamilyChevy small block Gen I
    Engine Size5.3L/327
    Drivetrain4WD
    Power SteeringYes
    Power Brakes (application)Yes
    Air ConditioningYes
    Standard Transmission Column ShiftYes
    Standard Transmission Floor ShiftYes
    Automatic Transmission Column ShiftYes
    Automatic Transmission Floor ShiftNo
    Footnotes1 - Also available with A.I.R. injection manifold welded in place. Add suffix "S" to the part number when ordering (Not available with ceramic finish headers). 3 - Must modify stock exhaust to retain catalytic converters. 6 - Applications with oxygen sensor use reducer BIG-10105 for 2-1/2 in. 3-bolt flange or BIG-10110 for 3 in. 3-bolt flange. 23 - Installation requires Flowtech air conditioning bracket BIG-10042. 1979 and later vehicles equipped with short compressor, use original bracket. 58 - Will not fit angle plug heads.
  • MakeGMC
    ModelK25/K2500 SUBURBAN
    SubmodelBASE
    Beginning Year1968
    Ending Year1972
    Engine TypeV8
    Engine FamilyChevy small block Gen I
    Engine Size5.3L/327
    DrivetrainRWD
    Power SteeringYes
    Power Brakes (application)Yes
    Air ConditioningYes
    Standard Transmission Column ShiftYes
    Standard Transmission Floor ShiftYes
    Automatic Transmission Column ShiftYes
    Automatic Transmission Floor ShiftYes
    Footnotes1 - Also available with A.I.R. injection manifold welded in place. Add suffix "S" to the part number when ordering (Not available with ceramic finish headers). 3 - Must modify stock exhaust to retain catalytic converters. 23 - Installation requires Flowtech air conditioning bracket BIG-10042. 1979 and later vehicles equipped with short compressor, use original bracket. 32 - Pre-1970 vehicles with exhaust manifold mounted Alternator/Generator use bracket BIG-10031. 42 - May require clutch linkage modifications. 58 - Will not fit angle plug heads.
  • MakeGMC
    ModelK25/K2500 SUBURBAN
    SubmodelBASE
    Beginning Year1970
    Ending Year1969
    Engine TypeV8
    Engine FamilyChevy small block Gen I
    Engine Size5.0L/307
    DrivetrainRWD
    Power SteeringYes
    Power Brakes (application)Yes
    Air ConditioningYes
    Standard Transmission Column ShiftYes
    Standard Transmission Floor ShiftYes
    Automatic Transmission Column ShiftYes
    Automatic Transmission Floor ShiftNo
    Footnotes1 - Also available with A.I.R. injection manifold welded in place. Add suffix "S" to the part number when ordering (Not available with ceramic finish headers). 23 - Installation requires Flowtech air conditioning bracket BIG-10042. 1979 and later vehicles equipped with short compressor, use original bracket. 32 - Pre-1970 vehicles with exhaust manifold mounted Alternator/Generator use bracket BIG-10031. 42 - May require clutch linkage modifications. 58 - Will not fit angle plug heads.
  • MakeGMC
    ModelK25/K2500 SUBURBAN
    SubmodelBASE
    Beginning Year1970
    Ending Year1969
    Engine TypeV8
    Engine FamilyChevy small block Gen I
    Engine Size5.3L/327
    Drivetrain4WD
    Power SteeringYes
    Power Brakes (application)Yes
    Air ConditioningYes
    Standard Transmission Column ShiftYes
    Standard Transmission Floor ShiftYes
    Automatic Transmission Column ShiftYes
    Automatic Transmission Floor ShiftYes
    Footnotes1 - Also available with A.I.R. injection manifold welded in place. Add suffix "S" to the part number when ordering (Not available with ceramic finish headers). 3 - Must modify stock exhaust to retain catalytic converters. 6 - Applications with oxygen sensor use reducer BIG-10105 for 2-1/2 in. 3-bolt flange or BIG-10110 for 3 in. 3-bolt flange. 21 - On 1983-84 4WD it is necessary to remove the rubber stopper below the starter. 23 - Installation requires Flowtech air conditioning bracket BIG-10042. 1979 and later vehicles equipped with short compressor, use original bracket. 58 - Will not fit angle plug heads.
  • MakeGMC
    ModelK25/K2500 SUBURBAN
    SubmodelBASE
    Beginning Year1970
    Ending Year1973
    Engine TypeV8
    Engine FamilyChevy small block Gen I
    Engine Size5.0L/307
    Drivetrain4WD
    Power SteeringYes
    Power Brakes (application)Yes
    Air ConditioningYes
    Standard Transmission Column ShiftYes
    Standard Transmission Floor ShiftYes
    Automatic Transmission Column ShiftYes
    Automatic Transmission Floor ShiftNo
    Footnotes1 - Also available with A.I.R. injection manifold welded in place. Add suffix "S" to the part number when ordering (Not available with ceramic finish headers). 3 - Must modify stock exhaust to retain catalytic converters. 6 - Applications with oxygen sensor use reducer BIG-10105 for 2-1/2 in. 3-bolt flange or BIG-10110 for 3 in. 3-bolt flange. 23 - Installation requires Flowtech air conditioning bracket BIG-10042. 1979 and later vehicles equipped with short compressor, use original bracket. 58 - Will not fit angle plug heads.
  • MakeGMC
    ModelK25/K2500 SUBURBAN
    SubmodelBASE
    Beginning Year1970
    Ending Year1974
    Engine TypeV8
    Engine FamilyChevy small block Gen I
    Engine Size5.0L/307
    Drivetrain4WD
    Power SteeringYes
    Power Brakes (application)Yes
    Air ConditioningYes
    Standard Transmission Column ShiftNo
    Standard Transmission Floor ShiftYes
    Automatic Transmission Column ShiftYes
    Automatic Transmission Floor ShiftYes
    Footnotes1 - Also available with A.I.R. injection manifold welded in place. Add suffix "S" to the part number when ordering (Not available with ceramic finish headers). 3 - Must modify stock exhaust to retain catalytic converters. 6 - Applications with oxygen sensor use reducer BIG-10105 for 2-1/2 in. 3-bolt flange or BIG-10110 for 3 in. 3-bolt flange. 23 - Installation requires Flowtech air conditioning bracket BIG-10042. 1979 and later vehicles equipped with short compressor, use original bracket. 58 - Will not fit angle plug heads.
  • MakeGMC
    ModelK25/K2500 SUBURBAN
    SubmodelBASE
    Beginning Year1970
    Ending Year1972
    Engine TypeV8
    Engine FamilyChevy small block Gen I
    Engine Size5.7L/350
    Drivetrain4WD
    Power SteeringYes
    Power Brakes (application)Yes
    Air ConditioningYes
    Standard Transmission Column ShiftNo
    Standard Transmission Floor ShiftYes
    Automatic Transmission Column ShiftYes
    Automatic Transmission Floor ShiftYes
    Footnotes1 - Also available with A.I.R. injection manifold welded in place. Add suffix "S" to the part number when ordering (Not available with ceramic finish headers). 3 - Must modify stock exhaust to retain catalytic converters. 23 - Installation requires Flowtech air conditioning bracket BIG-10042. 1979 and later vehicles equipped with short compressor, use original bracket. 42 - May require clutch linkage modifications. 58 - Will not fit angle plug heads.
  • MakeGMC
    ModelK25/K2500 SUBURBAN
    SubmodelBASE
    Beginning Year1973
    Ending Year1974
    Engine TypeV8
    Engine FamilyChevy small block Gen I
    Engine Size5.7L/350
    Drivetrain4WD
    Power SteeringYes
    Power Brakes (application)Yes
    Air ConditioningYes
    Standard Transmission Column ShiftNo
    Standard Transmission Floor ShiftYes
    Automatic Transmission Column ShiftYes
    Automatic Transmission Floor ShiftYes
    Footnotes1 - Also available with A.I.R. injection manifold welded in place. Add suffix "S" to the part number when ordering (Not available with ceramic finish headers). 3 - Must modify stock exhaust to retain catalytic converters. 23 - Installation requires Flowtech air conditioning bracket BIG-10042. 1979 and later vehicles equipped with short compressor, use original bracket. 42 - May require clutch linkage modifications. 58 - Will not fit angle plug heads.
  • MakeGMC
    ModelK25/K2500 SUBURBAN
    SubmodelBASE
    Beginning Year1973
    Ending Year1973
    Engine TypeV8
    Engine FamilyChevy small block Gen I
    Engine Size5.0L/307
    Drivetrain4WD
    Power SteeringYes
    Power Brakes (application)Yes
    Air ConditioningYes
    Standard Transmission Column ShiftNo
    Standard Transmission Floor ShiftYes
    Automatic Transmission Column ShiftYes
    Automatic Transmission Floor ShiftYes
    Footnotes1 - Also available with A.I.R. injection manifold welded in place. Add suffix "S" to the part number when ordering (Not available with ceramic finish headers). 3 - Must modify stock exhaust to retain catalytic converters. 6 - Applications with oxygen sensor use reducer BIG-10105 for 2-1/2 in. 3-bolt flange or BIG-10110 for 3 in. 3-bolt flange. 23 - Installation requires Flowtech air conditioning bracket BIG-10042. 1979 and later vehicles equipped with short compressor, use original bracket. 58 - Will not fit angle plug heads.
  • MakeGMC
    ModelK25/K2500 SUBURBAN
    SubmodelBASE
    Beginning Year1968
    Ending Year1974
    Engine TypeV8
    Engine FamilyChevy small block Gen I
    Engine Size5.7L/350
    Drivetrain4WD
    Power SteeringYes
    Power Brakes (application)Yes
    Air ConditioningYes
    Standard Transmission Column ShiftNo
    Standard Transmission Floor ShiftYes
    Automatic Transmission Column ShiftYes
    Automatic Transmission Floor ShiftYes
    Footnotes1 - Also available with A.I.R. injection manifold welded in place. Add suffix "S" to the part number when ordering (Not available with ceramic finish headers). 3 - Must modify stock exhaust to retain catalytic converters. 6 - Applications with oxygen sensor use reducer BIG-10105 for 2-1/2 in. 3-bolt flange or BIG-10110 for 3 in. 3-bolt flange. 21 - On 1983-84 4WD it is necessary to remove the rubber stopper below the starter. 23 - Installation requires Flowtech air conditioning bracket BIG-10042. 1979 and later vehicles equipped with short compressor, use original bracket. 58 - Will not fit angle plug heads.
  • MakeGMC
    ModelK35/K3500 PICKUP
    SubmodelBASE
    Beginning Year1968
    Ending Year1973
    Engine TypeV8
    Engine FamilyChevy small block Gen I
    Engine Size5.0L/307
    Drivetrain4WD
    Power SteeringYes
    Power Brakes (application)Yes
    Air ConditioningYes
    Standard Transmission Column ShiftYes
    Standard Transmission Floor ShiftYes
    Automatic Transmission Column ShiftYes
    Automatic Transmission Floor ShiftYes
    Footnotes1 - Also available with A.I.R. injection manifold welded in place. Add suffix "S" to the part number when ordering (Not available with ceramic finish headers). 3 - Must modify stock exhaust to retain catalytic converters. 6 - Applications with oxygen sensor use reducer BIG-10105 for 2-1/2 in. 3-bolt flange or BIG-10110 for 3 in. 3-bolt flange. 23 - Installation requires Flowtech air conditioning bracket BIG-10042. 1979 and later vehicles equipped with short compressor, use original bracket. 58 - Will not fit angle plug heads.
  • MakeGMC
    ModelK35/K3500 PICKUP
    SubmodelBASE
    Beginning Year1967
    Ending Year1967
    Engine TypeV8
    Engine FamilyChevy small block Gen I
    Engine Size4.6L/283
    Drivetrain4WD
    Power SteeringYes
    Power Brakes (application)Yes
    Air ConditioningYes
    Standard Transmission Column ShiftNo
    Standard Transmission Floor ShiftYes
    Automatic Transmission Column ShiftYes
    Automatic Transmission Floor ShiftYes
    Footnotes1 - Also available with A.I.R. injection manifold welded in place. Add suffix "S" to the part number when ordering (Not available with ceramic finish headers). 3 - Must modify stock exhaust to retain catalytic converters. 23 - Installation requires Flowtech air conditioning bracket BIG-10042. 1979 and later vehicles equipped with short compressor, use original bracket. 32 - Pre-1970 vehicles with exhaust manifold mounted Alternator/Generator use bracket BIG-10031. 42 - May require clutch linkage modifications. 58 - Will not fit angle plug heads.
  • MakeGMC
    ModelK35/K3500 PICKUP
    SubmodelBASE
    Beginning Year1967
    Ending Year1967
    Engine TypeV8
    Engine FamilyChevy small block Gen I
    Engine Size4.6L/283
    Drivetrain4WD
    Power SteeringYes
    Power Brakes (application)Yes
    Air ConditioningYes
    Standard Transmission Column ShiftYes
    Standard Transmission Floor ShiftYes
    Automatic Transmission Column ShiftYes
    Automatic Transmission Floor ShiftNo
    Footnotes1 - Also available with A.I.R. injection manifold welded in place. Add suffix "S" to the part number when ordering (Not available with ceramic finish headers). 3 - Must modify stock exhaust to retain catalytic converters. 23 - Installation requires Flowtech air conditioning bracket BIG-10042. 1979 and later vehicles equipped with short compressor, use original bracket. 42 - May require clutch linkage modifications. 58 - Will not fit angle plug heads.
  • MakeGMC
    ModelK35/K3500 PICKUP
    SubmodelBASE
    Beginning Year1967
    Ending Year1968
    Engine TypeV8
    Engine FamilyChevy small block Gen I
    Engine Size5.3L/327
    Drivetrain4WD
    Power SteeringYes
    Power Brakes (application)Yes
    Air ConditioningYes
    Standard Transmission Column ShiftYes
    Standard Transmission Floor ShiftYes
    Automatic Transmission Column ShiftYes
    Automatic Transmission Floor ShiftYes
    Footnotes1 - Also available with A.I.R. injection manifold welded in place. Add suffix "S" to the part number when ordering (Not available with ceramic finish headers). 3 - Must modify stock exhaust to retain catalytic converters. 23 - Installation requires Flowtech air conditioning bracket BIG-10042. 1979 and later vehicles equipped with short compressor, use original bracket. 32 - Pre-1970 vehicles with exhaust manifold mounted Alternator/Generator use bracket BIG-10031. 42 - May require clutch linkage modifications. 58 - Will not fit angle plug heads.
  • MakeGMC
    ModelK25/K2500 PICKUP
    SubmodelBASE
    Beginning Year1967
    Ending Year1968
    Engine TypeV8
    Engine FamilyChevy small block Gen I
    Engine Size5.3L/327
    Drivetrain4WD
    Power SteeringYes
    Power Brakes (application)Yes
    Air ConditioningYes
    Standard Transmission Column ShiftYes
    Standard Transmission Floor ShiftYes
    Automatic Transmission Column ShiftYes
    Automatic Transmission Floor ShiftNo
    Footnotes1 - Also available with A.I.R. injection manifold welded in place. Add suffix "S" to the part number when ordering (Not available with ceramic finish headers). 3 - Must modify stock exhaust to retain catalytic converters. 23 - Installation requires Flowtech air conditioning bracket BIG-10042. 1979 and later vehicles equipped with short compressor, use original bracket. 42 - May require clutch linkage modifications. 58 - Will not fit angle plug heads.
  • MakeGMC
    ModelK25/K2500 PICKUP
    SubmodelBASE
    Beginning Year1968
    Ending Year1970
    Engine TypeV8
    Engine FamilyChevy small block Gen I
    Engine Size5.0L/307
    Drivetrain4WD
    Power SteeringYes
    Power Brakes (application)Yes
    Air ConditioningYes
    Standard Transmission Column ShiftNo
    Standard Transmission Floor ShiftYes
    Automatic Transmission Column ShiftYes
    Automatic Transmission Floor ShiftYes
    Footnotes1 - Also available with A.I.R. injection manifold welded in place. Add suffix "S" to the part number when ordering (Not available with ceramic finish headers). 3 - Must modify stock exhaust to retain catalytic converters. 23 - Installation requires Flowtech air conditioning bracket BIG-10042. 1979 and later vehicles equipped with short compressor, use original bracket. 32 - Pre-1970 vehicles with exhaust manifold mounted Alternator/Generator use bracket BIG-10031. 42 - May require clutch linkage modifications. 58 - Will not fit angle plug heads.
  • MakeGMC
    ModelK25/K2500 PICKUP
    SubmodelBASE
    Beginning Year1968
    Ending Year1972
    Engine TypeV8
    Engine FamilyChevy small block Gen I
    Engine Size5.0L/307
    Drivetrain4WD
    Power SteeringYes
    Power Brakes (application)Yes
    Air ConditioningYes
    Standard Transmission Column ShiftNo
    Standard Transmission Floor ShiftYes
    Automatic Transmission Column ShiftYes
    Automatic Transmission Floor ShiftYes
    Footnotes1 - Also available with A.I.R. injection manifold welded in place. Add suffix "S" to the part number when ordering (Not available with ceramic finish headers). 3 - Must modify stock exhaust to retain catalytic converters. 23 - Installation requires Flowtech air conditioning bracket BIG-10042. 1979 and later vehicles equipped with short compressor, use original bracket. 32 - Pre-1970 vehicles with exhaust manifold mounted Alternator/Generator use bracket BIG-10031. 42 - May require clutch linkage modifications. 58 - Will not fit angle plug heads.
  • MakeGMC
    ModelK25/K2500 PICKUP
    SubmodelBASE
    Beginning Year1969
    Ending Year1970
    Engine TypeV8
    Engine FamilyChevy small block Gen I
    Engine Size5.7L/350
    Drivetrain4WD
    Power SteeringYes
    Power Brakes (application)Yes
    Air ConditioningYes
    Standard Transmission Column ShiftNo
    Standard Transmission Floor ShiftYes
    Automatic Transmission Column ShiftYes
    Automatic Transmission Floor ShiftYes
    Footnotes1 - Also available with A.I.R. injection manifold welded in place. Add suffix "S" to the part number when ordering (Not available with ceramic finish headers). 3 - Must modify stock exhaust to retain catalytic converters. 6 - Applications with oxygen sensor use reducer BIG-10105 for 2-1/2 in. 3-bolt flange or BIG-10110 for 3 in. 3-bolt flange. 21 - On 1983-84 4WD it is necessary to remove the rubber stopper below the starter. 23 - Installation requires Flowtech air conditioning bracket BIG-10042. 1979 and later vehicles equipped with short compressor, use original bracket. 58 - Will not fit angle plug heads.

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