Speed Pro pistons: Cast Hyperuetectic Pistons Sealed Power / Speed Pro pistons, is the premier brand of replacement engine parts for automotive, performance and a wide range of other applications. Often misspelled as SpeedPro Pistons, Sealed Power & Spped Pro replacement pistons are manufactured from exclusive aluminum alloys matched to the engines’ performance requirements. Proprietary casting, machining techniques and quality control procedures ensure unsurpassed reliability and service

Why You Need Speed Pro Pistons

Optimized metallurgy allows operation with standard ring end gaps and conventional ring land locations
Speed Pro pistons are Highly resistant to scuffing
Speed Pro pistons are the Ideal choice for street performance applications
Most Feature DUROSHIELD^® anti-friction skirt coating

Speed Pro Pistons DUROSHIELD^® skirt coating dramatically reduces friction and related scuffing without the need to adjust wall clearance. The result is enhanced ring seal, increased horsepower and extended piston life.

Speed-Pro’s hypereutectic pistons operate perfectly with standard ring end gaps and have conventional ring land locations. When compared to traditional cast pistons, which are not designed for performance use, the hypereutectic pistons are significantly stronger, particularly in the highly loaded ring land, skirt and pin bore areas. Speed-Pro’s FM244 Alloy Piston contains 16.5 percent silicon and has excellent tensile and fatigue strength. This material’s improved thermal characteristics, its greater hardness and the increased resistance to scuffing permit tight bore clearances which help minimize noise on cold engine start up. This quiet operation, along with a lower cost are the primary advantages over a comparable forged piston. These hypereutectic pistons are an excellent choice for street performance, “claimer” oval track engines and bracket racing use. Speed Pro pistons will also work well in moderate supercharged applications and are suitable for towing and marine use

Learn More

Learn more about Skirt Coatings opens new window

How To Check Piston to Valve and Cylinder Head Clearances , Compression Ratio Determination opens new window

Speed Pro Hypereutectic Piston Applications

Click here for Buick piston applications

Click here For Ford piston applications

Click here for Chrysler piston applications

Click here for SB and BB Chevy piston applications

This product is in the following categories:

Home > Engine Parts > Pistons > Hypereutectic

Manufacturer:

Sealed Power Pistons

Piston to Valve and Cylinder Head Clearances

Part #: Clearance tech

Piston to Valve and Cylinder Head ClearancesPiston to valve clearance should be a minimum of .100". This clearance will be changed if heads or block have been machined and must be checked at asse...

Compression Ratio Determination

Part #: Compression tech

Compression Ratio Determination

Choosing the correct compression ratio for an application is the key to success. Too high a ratio will cause far more problems than will one that is a bit low, so b...

Sealed Power Hypereutectic Flat Top 4 Valve Reliefs Piston

Part #: H345DCP

350 BASED engine (4.000 bore x 3.480 Stroke) press pin, coated skirt. Pistons sold in sets of 8, price shown is each. Do not use in 4.3L V6!

Sealed Power Hypereutectic Flat Top 4 Valve Reliefs Piston +.020 Over

Part #: H345DCP20

350 BASED eng. +.020 over sized (4.000 bore x 3.480 Stroke) Float or press pin, coated skirt. Pistons sold in sets of 8, price shown is each Do not use in a 4.3L

Sealed Power Hypereutectic Flat Top 4 Valve Reliefs Piston +.030 Over

Part #: H345DCP30

350 BASED eng. +.030 over sized (4.000 bore x 3.480 Stroke) Float or press pin, coated skirt. Pistons sold in sets of 8, price shown is each Do not use in a 4.3L

Sealed Power Hypereutectic Flat Top 4 Valve Reliefs Piston +.040 Over

Part #: H345DCP40

350 BASED eng. +.040 over sized (4.000 bore x 3.480 Stroke) Float or press pin, coated skirt. Pistons sold in sets of 8, price shown is each Do not use in a 4.3L

Sealed Power Hypereutectic Flat Top 4 Valve Reliefs Piston +.060 Over

Part #: H345DCP60

350 BASED eng. +.060 over sized (4.000 bore x 3.480 Stroke) Float or press pin, coated skirt. Pistons sold in sets of 8, price shown is each Do not use in a 4.3L

Speed-Pro Hypereutectic Flat Top 4 Valve Reliefs Piston 4.125 x 3.750

Part #: H400CP

400 BASED eng. (4.125 bore x 3.750 Stroke) 5.56" rod, press pin, coated skirt. Pistons sold in sets of 8, price shown is each

Sealed Power Hypereutectic .100 Dome w/ 1 Relief Piston

Part #: H426CP

454 BASED; .100 Dome w/ 1 valve relief, 4.250 bore x 4.00 stroke, press or floating pin, coated skirts. Pistons sold in sets of 8, price shown is each.

Sealed Power Hypereutectic Flat Top 4 Valve Reliefs Piston

Part #: H534CP

305 BASED eng. (3.736 bore x 3.480 Stroke) press pin, coated skirt. Pistons sold in sets of 8, price shown is each.

Sealed Power Hypereutectic .340 Dome 2 Valve Reliefs Piston

Part #: H581CP

454 BASED; .340 Dome; 2 valve reliefs, 4.250 bore x 4.00 stroke, press or floating pin, coated skirts. Pistons sold in sets of 8, price shown is each.

Sealed Power Hypereutectic Dome Pistons .135 Dish With 4 Valve Reliefs

Part #: H615CP

400 BASED eng. (4.125 bore x 3.750 Stroke) .135 Dish, 5.7" rod, press or floating pin, coated skirt. Pistons sold in sets of 8, price shown is each.

Sealed Power Hypereutectic Piston Flat Top 4 Valve Reliefs

Part #: H616CP

400 BASED eng. (4.125 bore x 3.750 Stroke) Flat Top, 5.7" rod, press or floating pin, coated skirt. Pistons sold in sets of 8, price shown is each.

Sealed Power Hypereutectic .275 Dome Piston

Part #: H617CP

350 BASED eng. (4.000 bore x 3.480 Stroke) .275 Dome, press or float pin, coated skirt. Pistons sold in sets of 8, price shown is each.

Sealed Power Hypereutectic .125 Dome Piston

Part #: H618CP

350 BASED eng. (4.000 bore x 3.480 Stroke) .125 Dome, press or float pin, coated skirt. Pistons sold in sets of 8, price shown is each.

Sealed Power Hypereutectic .200 Dome Piston

Part #: H635CP

383 Stroker Based eng. .200 Dome (4.000 bore x 3.750 Stroke) press or float pin, coated skirt. 350 engines using a 400 SBC crank with 5.7" rods. Pistons sold in sets of 8, price shown is each.

Sealed Power Hypereutectic Flat Top 2 Valve Reliefs Piston

Part #: H660CP

327 BASED eng. (4.000 bore x 3.250 Stroke) press pin, coated skirt. Pistons sold in sets of 8, price shown is each. Ring dimensions 5/64, 5/64, 3/16, Flat Top 2 valve reliefs, Compression dist 1.675, Deck Clearance .025, Skirt Clearance .0010

Sealed Power Hypereutectic .210 Dome 2 Valve Reliefs Piston

Part #: H693CP

454 BASED; .210 Dome; 2 valve reliefs, 4.250 bore x 4.00 stroke, press or floating pin, 6.135" rods, coated skirts. Pistons sold in sets of 8, price shown is each.

Hypereutectic Pistons 383 Stroker Based Engine

Part #: H859CP

Hypereutectic Pistons 383 Stroker Based Engine

Sealed Power Hypereutectic Flat Top 2 Valve Reliefs Piston

Part #: H860CP

383 Stroker Based eng. Flat 2 reliefs(4.000 bore x 3.750 Stroke) press or float pin, coated skirt 350 engines using a 400 SBC crank with 5.7" rods. Pistons sold in sets of 8, price shown is each.

Speed Pro Pistons - Hypereutectic Pistons for Chevy

Part #: Skirt Coatings

A Coated Skirt piston can be identified buy a (C ) in the end of the main part number for instance H345NP is not coated a H345NCP is coated