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In-Store Pickup Location

Speed-Pro Hypereutectic Pistons H581CP

Pistons, Hypereutectic, Dome, 4.250 in. Bore, Chevy, Set of 8

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  • Order this item and get free delivery and handling on your entire order! Offer excludes truck freight and oversize fees. Valid on orders shipped in the contiguous United States.

Brand: Speed Pro

Manufacturer's Part Number: H581CP

Part Type: Pistons

Product Line: Speed-Pro Hypereutectic Pistons

Summit Racing Part Number: SLP-H581CP

UPC: 614046227880

Bore (in): 4.250 in.

Bore (mm): 107.950mm

Piston Style: Dome, with two valve reliefs

Piston Material: Hypereutectic aluminum

Compression Height (in): 1.640 in.

Dome Height (in): 0.340 in.

Piston Head Volume (cc): -30.00cc

Wrist Pin Style: Press-fit or floating

Pin Lock Rings Included: No

Wrist Pin Included: Yes

Pin Diameter (in): 0.990 in.

Piston Ring Thickness: 5/64 in. x 5/64 in. x 3/16 in.

Piston Rings Included: No

Quantity: Sold as a set of 8.

Notes: DurOshield® coated piston skirt.

In-Store Pickup: Choose In-store pick-up (OH, NV, GA, TX) on our web site.

Calculator Compression Calculator

Tool Stroker Combinations

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.

Questions & Answers Ask a Product Question
Q:

What size are the valve reliefs? Will they work with a 2.25 intake valves?
Speed Pro doesn't list any information about this.

Asked by STEVE on November 22, 2018

A:

Intake valve pocket is cut for 2.250" valve, Please clay check for piston to valve with .500" of more lift.

Speed Pro Speed Pro Answer - November 27, 2018

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Q:

Are these .60 pistons?

Asked by ANTONIO on August 13, 2017

A:

Thank you for your question. Speed Pro H581CP pistons are for engines with a stock bore size. Speed Pro H581CP60 are for engines with a 0.060 in. overbore.

Summit RacingSummit Racing Answer - August 14, 2017

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Q:

I blew up my 454 i have the H581CP pistons in only 2 pistons were hurt I am wondering if you can purchase these pistons individually or if you have to buy a set?

Asked by BRETT on March 03, 2017

A:

I have found singles elsewhere but not on Summits site.... do a Google search for the part number and you should find them if you are still working

JEREMY from IL answered on May 17, 2017

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Q:

Are you able to purchase the pistons individually? i blew my big block up and only need 2 pistons.

Asked by BRETT on March 03, 2017

A:

Unfortunately our Speed Pro H581CP our only sold in complete sets of (8)

Speed Pro Speed Pro Answer - August 16, 2018

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+See All Questions (5)

Some parts are not legal for use in California or other states with similar laws / regulations

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