Home / Shop / Speed-Pro Hypereutectic Pistons H423DCP30 Pistons, Hypereutectic, Dish, 4.030 in. Bore, Chevy, Set of 8

Speed-Pro Hypereutectic Pistons H423DCP30 Pistons, Hypereutectic, Dish, 4.030 in. Bore, Chevy, Set of 8

SKU: SLPH423DCP30

Pistons

Sealed Power

Speed-Pro Hypereutectic Pistons H423DCP30 Pistons, Hypereutectic, Dish, 4.030 in. Bore, Chevy, Set of 8

SKU: SLPH423DCP30

Pistons

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Description

If you're looking for pistons with an unbeatable combination of performance and value, then Speed-Pro hypereutectic pistons are for you. These pistons are manufactured from aluminum alloy that contains 16 percent silicon for greater strength and wear resistance. They're also molded in the latest permanent-mold technology to ensure the precise fit and tight bore clearances that today's top engine builders demand. Hypereutectic pistons are ideal for use in high performance street, bracket, and oval track racing—and will work perfectly with normal ring end gaps. Choose the model designed for your vehicle and engine application.

Part Type

Cast Piston

Data: v4.2 - Upd: 2026-09-30 14:11:31

Specifications

Product Attributes - Brand: Sealed Power
Product Attributes - Manufacturer's Part Number: H423DCP30
Product Attributes - Part Type: Pistons
Product Attributes - Product Line: Speed-Pro Hypereutectic Pistons
Product Attributes - UPC: 019826500786
Product Attributes - Piston Rings Included: No
Product Attributes - Bore (in.): 4.030 in.
Product Attributes - Bore (mm): 102.362mm
Product Attributes - Stroke: 3.480 in.
Product Attributes - Engine Stroke Type: Stock
Product Attributes - Rod Length: 5.700 in.
Product Attributes - Piston Style: Dish, with four valve reliefs
Product Attributes - Piston Material: Hypereutectic aluminum
Product Attributes - Compression Height (in.): 1.548 in.
Product Attributes - Piston Head Volume (cc): +12.30cc
Product Attributes - Wrist Pin Style: Press-fit or floating
Product Attributes - Wrist Pin Retainers Included: No
Product Attributes - Wrist Pin Included: Yes
Product Attributes - Pin Diameter (in.): 0.927 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 - Special Attention: DurOshield® coated piston skirt. These pistons can be free floated but locks must be purchased separately.

Reference Information

Brand Name/s	Sealed Power
StreetFX SKU	slpH423DCP30
SFX Item ID	5029525
Supplier Item Code	5029525
Manufacturer SKU	H423DCP30
Manufacturer UPC	19826500786
Alternative References	SEAH423DCP30

Compatibility

Application Data

Make	BUICK
Model	CENTURY
Submodel	BASE
Beginning Year	1977
Ending Year	1977
Engine Type	V8
Liter	5.7
CID	350
Engine Family	Chevy small block Gen I
Engine Size	5.7L/350
Application Notes	.9275" Pin Dia. 2 Ring(s) 5/64 Groove 1 Ring(s) 3/16 Groove 1.548 CD .098 dish, 4 reliefs Use w/Lock Ring LR-63 DUROSHIELD« skirt coated piston .030" Oversize
Engine VIN Code	L

Make	BUICK
Model	CENTURY
Submodel	BASE
Beginning Year	1977
Ending Year	1977
Engine Type	V8
Liter	5.7
CID	350
Engine Family	Chevy small block Gen I
Engine Size	5.7L/350
Application Notes	Hypereutectic; w/machined valve reliefs and circlip grooves; Use w/LR-63 lock ring for floated applications .9275" Pin Dia. 2 Ring(s) 5/64 Groove 1 Ring(s) 3/16 Groove 1.548 CD .098 dish, 4 reliefs Use w/Lock Ring LR-63 DUROSHIELD« skirt coated piston .03
Engine VIN Code	L

Make	BUICK
Model	CENTURY
Submodel	BASE
Beginning Year	1977
Ending Year	1977
Engine Type	V8
Liter	5.7
CID	350
Engine Family	Chevy small block Gen I
Engine Size	5.7L/350
Application Notes	Hypereutectic Use w/LR-63 lock ring for floated applications 3 Ring Groove Piston Ring Groove Widths: 5/64, 5/64, 3/16 (in.) 1.548 CD .098 dish, 4 reliefs DUROSHIELD skirt coated piston w/machined valve reliefs and circlip grooves
Engine VIN Code	L

Make	BUICK
Model	CENTURY
Submodel	BASE
Beginning Year	1977
Ending Year	1977
Engine Type	V8
Liter	5.7
CID	350
Engine Family	Chevy small block Gen I
Engine Size	5.7L/350
Application Notes	Hypereutectic w/machined valve reliefs and circlip grooves .9275" Pin Dia. Use w/LR-63 lock ring for floated applications 2 Ring(s) 5/64 Groove 1 Ring(s) 3/16 Groove 1.548 CD .098 dish, 4 reliefs; Use w/Lock Ring LR-63; DUROSHIELD« skirt coated piston; .0
Engine VIN Code	L

Make	BUICK
Model	CENTURY
Submodel	BASE
Beginning Year	1977
Ending Year	1977
Engine Type	V8
Liter	5.7
CID	350
Engine Family	Chevy small block Gen I
Engine Size	5.7L/350
Application Notes	Hypereutectic w/machined valve reliefs and circlip grooves Use w/LR-63 lock ring for floated applications .9275" Pin Dia. 2 Ring(s) 5/64 Groove 1 Ring(s) 3/16 Groove 1.548 CD .098 dish, 4 reliefs; Use w/Lock Ring LR-63; DUROSHIELD« skirt coated piston; .0
Engine VIN Code	L

Make	BUICK
Model	CENTURY
Submodel	BASE
Beginning Year	1977
Ending Year	1977
Engine Type	V8
Liter	5.7
CID	350
Engine Family	Chevy small block Gen I
Engine Size	5.7L/350
Application Notes	Hypereutectic w/machined valve reliefs and circlip grooves Use w/LR-63 lock ring for floated applications .9275" Pin Dia. 2 Ring(s) 5/64 Groove 1 Ring(s) 3/16 Groove 1.548 CD .098 dish, 4 reliefs; Use w/Lock Ring LR-63; DUROSHIELD® skirt coated piston; .0
Engine VIN Code	L

Make	BUICK
Model	CENTURY
Submodel	BASE
Beginning Year	1977
Ending Year	1977
Engine Type	V8
Liter	5.7
CID	350
Engine Family	Chevy small block Gen I
Engine Size	5.7L/350
Application Notes	Hypereutectic w/machined valve reliefs and circlip grooves Use w/LR-63 lock ring for floated applications .9275" Pin Dia. 2 Ring(s) 5/64 Groove 1 Ring(s) 3/16 Groove 1.548 CD .098 dish, 4 reliefs
Engine VIN Code	L

Make	BUICK
Model	CENTURY
Submodel	BASE
Beginning Year	1977
Ending Year	1977
Engine Type	V8
Liter	5.7
CID	350
Engine Family	Chevy small block Gen I
Engine Size	5.7L/350
Application Notes	Hypereutectic w/machined valve reliefs and circlip grooves Use w/LR-63 lock ring for floated applications 2 Groove(s) 5/64 1 Groove(s) 3/16 1.548 CD .098 dish, 4 reliefs Use w/Lock Ring LR-63; DUROSHIELD skirt coated piston; .030" Oversize
Engine VIN Code	L

Make	BUICK
Model	CENTURY
Submodel	BASE
Beginning Year	1977
Ending Year	1977
Engine Type	V8
Liter	5.7
CID	350
Engine Family	Chevy small block Gen I
Engine Size	5.7L/350
Application Notes	Hypereutectic w/machined valve reliefs and circlip grooves Use w/LR-63 lock ring for floated applications 2 Groove(s) 5/64 1 Groove(s) 3/16 1.548 CD .098 dish, 4 reliefs Use w/Lock Ring LR-63; DUROSHIELD® skirt coated piston; .030" Oversize
Engine VIN Code	L

Make BUICK
Model CENTURY
Submodel BASE
Beginning Year 1977
Ending Year 1977
Engine Type V8
Liter 5.7
CID 350
Engine Family Chevy small block Gen I
Engine Size 5.7L/350
Engine VIN Code L

Make	BUICK
Model	CENTURY
Submodel	BASE
Beginning Year	1977
Ending Year	1977
Engine Type	V8
Liter	5.7
CID	350
Engine Family	Chevy small block Gen I
Engine Size	5.7L/350
Application Notes	Ring Groove Widths: 5/64in , 5/64in , 3/16in Sold as Set Priced Individually
Engine VIN Code	L

Make BUICK
Model CENTURY
Submodel BASE
Beginning Year 1977
Ending Year 1977
Engine Type V8
Liter 5.7
CID 350
Engine Family Chevy small block Gen I
Engine Size 5.7L/350
Application Notes Sold as Set
Engine VIN Code L

Make	BUICK
Model	CENTURY
Submodel	BASE
Beginning Year	1977
Ending Year	1977
Engine Type	V8
Liter	5.7
CID	350
Engine Family	Chevy small block Gen I
Engine Size	5.7L/350
Application Notes	Sold as Set Priced Individually
Engine VIN Code	L

Make	BUICK
Model	CENTURY
Submodel	CUSTOM
Beginning Year	1977
Ending Year	1979
Engine Type	V8
Liter	5.7
CID	350
Engine Family	Chevy small block Gen I
Engine Size	5.7L/350
Application Notes	.9275" Pin Dia. 2 Ring(s) 5/64 Groove 1 Ring(s) 3/16 Groove 1.548 CD .098 dish, 4 reliefs Use w/Lock Ring LR-63 DUROSHIELD« skirt coated piston .030" Oversize
Engine VIN Code	L

Make	BUICK
Model	CENTURY
Submodel	CUSTOM
Beginning Year	1977
Ending Year	1979
Engine Type	V8
Liter	5.7
CID	350
Engine Family	Chevy small block Gen I
Engine Size	5.7L/350
Application Notes	Hypereutectic; w/machined valve reliefs and circlip grooves; Use w/LR-63 lock ring for floated applications .9275" Pin Dia. 2 Ring(s) 5/64 Groove 1 Ring(s) 3/16 Groove 1.548 CD .098 dish, 4 reliefs Use w/Lock Ring LR-63 DUROSHIELD« skirt coated piston .03
Engine VIN Code	L

Make	BUICK
Model	CENTURY
Submodel	CUSTOM
Beginning Year	1977
Ending Year	1979
Engine Type	V8
Liter	5.7
CID	350
Engine Family	Chevy small block Gen I
Engine Size	5.7L/350
Application Notes	Hypereutectic Use w/LR-63 lock ring for floated applications 3 Ring Groove Piston Ring Groove Widths: 5/64, 5/64, 3/16 (in.) 1.548 CD .098 dish, 4 reliefs DUROSHIELD skirt coated piston w/machined valve reliefs and circlip grooves
Engine VIN Code	L

Make	BUICK
Model	CENTURY
Submodel	CUSTOM
Beginning Year	1977
Ending Year	1979
Engine Type	V8
Liter	5.7
CID	350
Engine Family	Chevy small block Gen I
Engine Size	5.7L/350
Application Notes	Hypereutectic w/machined valve reliefs and circlip grooves .9275" Pin Dia. Use w/LR-63 lock ring for floated applications 2 Ring(s) 5/64 Groove 1 Ring(s) 3/16 Groove 1.548 CD .098 dish, 4 reliefs; Use w/Lock Ring LR-63; DUROSHIELD« skirt coated piston; .0
Engine VIN Code	L

Make	BUICK
Model	CENTURY
Submodel	CUSTOM
Beginning Year	1977
Ending Year	1979
Engine Type	V8
Liter	5.7
CID	350
Engine Family	Chevy small block Gen I
Engine Size	5.7L/350
Application Notes	Hypereutectic w/machined valve reliefs and circlip grooves Use w/LR-63 lock ring for floated applications .9275" Pin Dia. 2 Ring(s) 5/64 Groove 1 Ring(s) 3/16 Groove 1.548 CD .098 dish, 4 reliefs; Use w/Lock Ring LR-63; DUROSHIELD« skirt coated piston; .0
Engine VIN Code	L

Make	BUICK
Model	CENTURY
Submodel	CUSTOM
Beginning Year	1977
Ending Year	1979
Engine Type	V8
Liter	5.7
CID	350
Engine Family	Chevy small block Gen I
Engine Size	5.7L/350
Application Notes	Hypereutectic w/machined valve reliefs and circlip grooves Use w/LR-63 lock ring for floated applications .9275" Pin Dia. 2 Ring(s) 5/64 Groove 1 Ring(s) 3/16 Groove 1.548 CD .098 dish, 4 reliefs; Use w/Lock Ring LR-63; DUROSHIELD® skirt coated piston; .0
Engine VIN Code	L

Make	BUICK
Model	CENTURY
Submodel	CUSTOM
Beginning Year	1977
Ending Year	1979
Engine Type	V8
Liter	5.7
CID	350
Engine Family	Chevy small block Gen I
Engine Size	5.7L/350
Application Notes	Hypereutectic w/machined valve reliefs and circlip grooves Use w/LR-63 lock ring for floated applications .9275" Pin Dia. 2 Ring(s) 5/64 Groove 1 Ring(s) 3/16 Groove 1.548 CD .098 dish, 4 reliefs
Engine VIN Code	L

Make	BUICK
Model	CENTURY
Submodel	CUSTOM
Beginning Year	1977
Ending Year	1979
Engine Type	V8
Liter	5.7
CID	350
Engine Family	Chevy small block Gen I
Engine Size	5.7L/350
Application Notes	Hypereutectic w/machined valve reliefs and circlip grooves Use w/LR-63 lock ring for floated applications 2 Groove(s) 5/64 1 Groove(s) 3/16 1.548 CD .098 dish, 4 reliefs Use w/Lock Ring LR-63; DUROSHIELD skirt coated piston; .030" Oversize
Engine VIN Code	L

Make	BUICK
Model	CENTURY
Submodel	CUSTOM
Beginning Year	1977
Ending Year	1979
Engine Type	V8
Liter	5.7
CID	350
Engine Family	Chevy small block Gen I
Engine Size	5.7L/350
Application Notes	Hypereutectic w/machined valve reliefs and circlip grooves Use w/LR-63 lock ring for floated applications 2 Groove(s) 5/64 1 Groove(s) 3/16 1.548 CD .098 dish, 4 reliefs Use w/Lock Ring LR-63; DUROSHIELD® skirt coated piston; .030" Oversize
Engine VIN Code	L

Make BUICK
Model CENTURY
Submodel CUSTOM
Beginning Year 1977
Ending Year 1979
Engine Type V8
Liter 5.7
CID 350
Engine Family Chevy small block Gen I
Engine Size 5.7L/350
Engine VIN Code L

Make	BUICK
Model	CENTURY
Submodel	CUSTOM
Beginning Year	1977
Ending Year	1979
Engine Type	V8
Liter	5.7
CID	350
Engine Family	Chevy small block Gen I
Engine Size	5.7L/350
Application Notes	Ring Groove Widths: 5/64in , 5/64in , 3/16in Sold as Set Priced Individually
Engine VIN Code	L

Make BUICK
Model CENTURY
Submodel CUSTOM
Beginning Year 1977
Ending Year 1979
Engine Type V8
Liter 5.7
CID 350
Engine Family Chevy small block Gen I
Engine Size 5.7L/350
Application Notes Sold as Set
Engine VIN Code L

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Speed-Pro Hypereutectic Pistons H423DCP30 Pistons, Hypereutectic, Dish, 4.030 in. Bore, Chevy, Set of 8

Speed-Pro Hypereutectic Pistons H423DCP30 Pistons, Hypereutectic, Dish, 4.030 in. Bore, Chevy, Set of 8

Description

Part Type

Specifications

Reference Information

Compatibility

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