Home / Shop / Speed-Pro Forged Pistons L2377F30 Pistons, Forged, Flat, 4.280 in. Bore, Chevy, GMC, Set of 8

Speed-Pro Forged Pistons L2377F30 Pistons, Forged, Flat, 4.280 in. Bore, Chevy, GMC, Set of 8

SKU: SLPL2377F30

Pistons

Sealed Power

Speed-Pro Forged Pistons L2377F30 Pistons, Forged, Flat, 4.280 in. Bore, Chevy, GMC, Set of 8

SKU: SLPL2377F30

Pistons

BACKORDER This item will be special ordered in for you. Contact us prior to purchase if you require an ETA.

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Description

Speed-Pro forged pistons are made from extruded VMS-75 aluminum alloy that's forged under 3,000 tons of pressure to "near-net" shape. After that, they're machined to their final configuration. These pistons offer excellent strength and durability—and are capable of taking the punishment that's dished out on the street and in competition. They're available for a wide variety of applications, including OE replacements and all-out racing engines.

Part Type

Forged Piston

Data: v4.2 - Upd: 2026-10-13 22:06:09

Specifications

Product Attributes - Brand: Sealed Power
Product Attributes - Manufacturer's Part Number: L2377F30
Product Attributes - Part Type: Pistons
Product Attributes - Product Line: Speed-Pro Forged Pistons
Product Attributes - UPC: 087674905770
Product Attributes - Piston Rings Included: No
Product Attributes - Bore (in.): 4.280 in.
Product Attributes - Bore (mm): 108.712mm
Product Attributes - Stroke: 4.000 in.
Product Attributes - Engine Stroke Type: Stock
Product Attributes - Rod Length: 6.135 in.
Product Attributes - Piston Style: Flat top, with single valve relief
Product Attributes - Piston Material: Forged aluminum
Product Attributes - Compression Height (in.): 1.640 in.
Product Attributes - Piston Head Volume (cc): +4.90cc
Product Attributes - Wrist Pin Style: Press-fit
Product Attributes - Wrist Pin Retainers Included: No
Product Attributes - Wrist Pin Included: Yes
Product Attributes - Pin Diameter (in.): 0.989 in.
Product Attributes - Piston Ring Thickness: 5/64 in. x 5/64 in. x 3/16 in.
Product Attributes - File Fit: No
Product Attributes - Gapless: No
Product Attributes - Remanufactured: No
Product Attributes - Quantity: Sold as a set of 8.
Product Attributes - Notes: 45 degree top land chamfer. DurOshield® coated piston skirt.

Reference Information

Brand Name/s	Sealed Power
StreetFX SKU	slpL2377F30
SFX Item ID	5029188
Supplier Item Code	5029188
Manufacturer SKU	L2377F30
Manufacturer UPC	N/A
Alternative References	SEAL2377F30

Compatibility

Application Data

Make CHEVROLET
Beginning Year 1970
Ending Year 1990
Engine Type V8
Engine Family Chevy big block Mark IV
Engine Size 7.4L/454
Application Notes Deck clearance 0.025 inch. Skirt clearance 0.0030 inch.

Make	CHEVROLET
Beginning Year	1970
Ending Year	1990
Engine Type	V8
Engine Family	Chevy big block Mark IV
Engine Size	7.4L/454
Application Notes	Mercury Marine models 330, 330 MIE, 340/7.4L MIE,7.4L Bravo, 7.4L MIE w/Hurth, 7.4L Bravo, 454 Mag Alpha.

Make	CHEVROLET
Beginning Year	1971
Ending Year	1972
Engine Type	V8
Engine Family	Chevy big block Mark IV
Engine Size	7.4L/454
Application Notes	Passenger car original equipment style replacement, all except special high performance with 4 barrel carburetor.

Make CHEVROLET
Beginning Year 1973
Ending Year 1976
Engine Type V8
Engine Family Chevy big block Mark IV
Engine Size 7.4L/454
Application Notes Passenger car original equipment style replacement.
Make CHEVROLET
Beginning Year 1973
Ending Year 1990
Engine Type V8
Engine Family Chevy big block Mark IV
Engine Size 7.4L/454
Application Notes Light duty truck original equipment style replacement.

Make	CHEVROLET
Model	BEL AIR
Submodel	BASE
Beginning Year	1971
Ending Year	1971
Engine Type	V8
Liter	7.4
CID	454
CC	7439
Engine Family	Chevy big block Mark IV
Engine Size	7.4L/454
Application Notes	Exc. Spec. Hi-Perf. .030" Oversize Powerforged 3 Ring Groove Piston Ring Groove Widths: 5/64, 5/64, 3/16 (in.) 1.640 CD Flat, 2 reliefs, Chamfer DUROSHIELD skirt coated piston

Make	CHEVROLET
Model	BEL AIR
Submodel	BASE
Beginning Year	1971
Ending Year	1971
Engine Type	V8
Liter	7.4
CID	454
CC	7439
Engine Family	Chevy big block Mark IV
Engine Size	7.4L/454
Application Notes	Exc. Spec. Hi-Perf. Powerforged 0.9897" Pin Dia. 2 Ring(s) 5/64 Groove 1 Ring(s) 3/16 Groove 1.640 CD Flat, 2 reliefs, Chamfer DUROSHIELD« skirt coated piston; .030" Oversize

Make	CHEVROLET
Model	BEL AIR
Submodel	BASE
Beginning Year	1971
Ending Year	1971
Engine Type	V8
Liter	7.4
CID	454
CC	7439
Engine Family	Chevy big block Mark IV
Engine Size	7.4L/454
Application Notes	Exc. Spec. Hi-Perf. Powerforged 0.9897" Pin Dia. 2 Ring(s) 5/64 Groove 1 Ring(s) 3/16 Groove 1.640 CD Flat, 2 reliefs, Chamfer DUROSHIELD® skirt coated piston; .030" Oversize

Make	CHEVROLET
Model	BEL AIR
Submodel	BASE
Beginning Year	1971
Ending Year	1971
Engine Type	V8
Liter	7.4
CID	454
CC	7439
Engine Family	Chevy big block Mark IV
Engine Size	7.4L/454
Application Notes	Exc. Spec. Hi-Perf. Powerforged 0.9897" Pin Dia. 2 Ring(s) 5/64 Groove 1 Ring(s) 3/16 Groove 1.640 CD Flat, 2 reliefs, Chamfer DUROSHIELD® skirt coated piston

Make	CHEVROLET
Model	BEL AIR
Submodel	BASE
Beginning Year	1971
Ending Year	1971
Engine Type	V8
Liter	7.4
CID	454
CC	7439
Engine Family	Chevy big block Mark IV
Engine Size	7.4L/454
Application Notes	Exc. Spec. Hi-Perf. Powerforged 2 Groove(s) 5/64 1 Groove(s) 3/16 1.640 CD Flat, 2 reliefs, Chamfer DUROSHIELD skirt coated piston .030" Oversize

Make	CHEVROLET
Model	BEL AIR
Submodel	BASE
Beginning Year	1971
Ending Year	1971
Engine Type	V8
Liter	7.4
CID	454
CC	7439
Engine Family	Chevy big block Mark IV
Engine Size	7.4L/454
Application Notes	Exc. Spec. Hi-Perf. Powerforged 2 Groove(s) 5/64 1 Groove(s) 3/16 1.640 CD Flat, 2 reliefs, Chamfer DUROSHIELD® skirt coated piston .030" Oversize

Make	CHEVROLET
Model	BEL AIR
Submodel	BASE
Beginning Year	1971
Ending Year	1971
Engine Type	V8
Liter	7.4
CID	454
CC	7439
Engine Family	Chevy big block Mark IV
Engine Size	7.4L/454
Application Notes	Exc. Spec. Hi-Perf. Powerforged 2 Ring(s) 0.9897" Pin Dia. 5/64 Groove 1 Ring(s) 3/16 Groove 1.640 CD Flat, 2 reliefs, Chamfer DUROSHIELD« skirt coated piston; .030" Oversize

Make	CHEVROLET
Model	BEL AIR
Submodel	BASE
Beginning Year	1971
Ending Year	1971
Engine Type	V8
Liter	7.4
CID	454
CC	7439
Engine Family	Chevy big block Mark IV
Engine Size	7.4L/454
Application Notes	Except Special High Performance 0.030in Oversize Powerforged piston 3 Ring Piston Ring Groove Widths: 5/64in , 5/64in , 3/16in 1.640in Compression Distance Flat Head Piston with 2 Valve Reliefs DUROSHIELD Skirt Coated Piston

Make	CHEVROLET
Model	BEL AIR
Submodel	BASE
Beginning Year	1971
Ending Year	1971
Engine Type	V8
Liter	7.4
CID	454
CC	7439
Engine Family	Chevy big block Mark IV
Engine Size	7.4L/454
Application Notes	Except Special High Performance

Make	CHEVROLET
Model	BEL AIR
Submodel	BASE
Beginning Year	1971
Ending Year	1971
Engine Type	V8
Liter	7.4
CID	454
CC	7439
Engine Family	Chevy big block Mark IV
Engine Size	7.4L/454
Application Notes	Powerforged Exc. Spec. Hi-Perf. 0.9897" Pin Dia. 2 Ring(s) 5/64 Groove 1 Ring(s) 3/16 Groove 1.640 CD Flat, 2 reliefs, Chamfer DUROSHIELD® skirt coated piston .030" Oversize

Make	CHEVROLET
Model	BEL AIR
Submodel	BASE
Beginning Year	1971
Ending Year	1971
Engine Type	V8
Liter	7.4
CID	454
CC	7439
Engine Family	Chevy big block Mark IV
Engine Size	7.4L/454
Application Notes	Powerforged piston 3 Ring Piston Ring Groove Widths: 5/64in , 5/64in , 3/16in 1.640in Compression Distance Flat Head Piston with 2 Valve Reliefs DUROSHIELD Skirt Coated Piston Except Special High Performance 0.030in Oversize

Make	CHEVROLET
Model	BEL AIR
Submodel	BASE
Beginning Year	1971
Ending Year	1971
Engine Type	V8
Liter	7.4
CID	454
CC	7439
Engine Family	Chevy big block Mark IV
Engine Size	7.4L/454
Application Notes	Powerforged piston 3 Ring Piston Ring Groove Widths: 5/64in , 5/64in , 3/16in 1.640in Compression Distance Flat Head Piston with 2 Valve Reliefs DUROSHIELD Skirt Coated Piston Sold as Set Priced Individually Except Special High Performance 0.030in Oversiz

Make	CHEVROLET
Model	BEL AIR
Submodel	BASE
Beginning Year	1971
Ending Year	1971
Engine Type	V8
Liter	7.4
CID	454
CC	7439
Engine Family	Chevy big block Mark IV
Engine Size	7.4L/454
Application Notes	Powerforged piston Sold as Set Except Special High Performance

Make	CHEVROLET
Model	BEL AIR
Submodel	BASE
Beginning Year	1971
Ending Year	1971
Engine Type	V8
Liter	7.4
CID	454
CC	7439
Engine Family	Chevy big block Mark IV
Engine Size	7.4L/454
Application Notes	Sold as Set Priced Individually Except Special High Performance

Make CHEVROLET
Model BEL AIR
Submodel BASE
Beginning Year 1971
Ending Year 1971
Engine Type V8
Liter 7.4
CID 454
CC 7439
Engine Family Chevy big block Mark IV
Engine Size 7.4L/454

Make	CHEVROLET
Model	BEL AIR
Submodel	BASE
Beginning Year	1971
Ending Year	1971
Engine Type	V8
Liter	7.4
CID	454
CC	7441
Engine Family	Chevy big block Mark IV
Engine Size	7.4L/454
Application Notes	Exc. Spec. Hi-Perf. .030" Oversize Powerforged 3 Ring Groove Piston Ring Groove Widths: 5/64, 5/64, 3/16 (in.) 1.640 CD Flat, 2 reliefs, Chamfer DUROSHIELD skirt coated piston

Make	CHEVROLET
Model	BEL AIR
Submodel	BASE
Beginning Year	1971
Ending Year	1971
Engine Type	V8
Liter	7.4
CID	454
CC	7441
Engine Family	Chevy big block Mark IV
Engine Size	7.4L/454
Application Notes	Exc. Spec. Hi-Perf. Powerforged 0.9897" Pin Dia. 2 Ring(s) 5/64 Groove 1 Ring(s) 3/16 Groove 1.640 CD Flat, 2 reliefs, Chamfer DUROSHIELD® skirt coated piston; .030" Oversize

Make	CHEVROLET
Model	BEL AIR
Submodel	BASE
Beginning Year	1971
Ending Year	1971
Engine Type	V8
Liter	7.4
CID	454
CC	7441
Engine Family	Chevy big block Mark IV
Engine Size	7.4L/454
Application Notes	Exc. Spec. Hi-Perf. Powerforged 0.9897" Pin Dia. 2 Ring(s) 5/64 Groove 1 Ring(s) 3/16 Groove 1.640 CD Flat, 2 reliefs, Chamfer DUROSHIELD® skirt coated piston

Make	CHEVROLET
Model	BEL AIR
Submodel	BASE
Beginning Year	1971
Ending Year	1971
Engine Type	V8
Liter	7.4
CID	454
CC	7441
Engine Family	Chevy big block Mark IV
Engine Size	7.4L/454
Application Notes	Exc. Spec. Hi-Perf. Powerforged 2 Groove(s) 5/64 1 Groove(s) 3/16 1.640 CD Flat, 2 reliefs, Chamfer DUROSHIELD skirt coated piston .030" Oversize

Make	CHEVROLET
Model	BEL AIR
Submodel	BASE
Beginning Year	1971
Ending Year	1971
Engine Type	V8
Liter	7.4
CID	454
CC	7441
Engine Family	Chevy big block Mark IV
Engine Size	7.4L/454
Application Notes	Exc. Spec. Hi-Perf. Powerforged 2 Groove(s) 5/64 1 Groove(s) 3/16 1.640 CD Flat, 2 reliefs, Chamfer DUROSHIELD® skirt coated piston .030" Oversize

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Speed-Pro Forged Pistons L2377F30 Pistons, Forged, Flat, 4.280 in. Bore, Chevy, GMC, Set of 8

Speed-Pro Forged Pistons L2377F30 Pistons, Forged, Flat, 4.280 in. Bore, Chevy, GMC, Set of 8

Description

Part Type

Specifications

Reference Information

Compatibility

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