Speed-Pro
Hi Performance Hypereutectic Replacement Piston
These pistons feature a new digital actuated diamond turning process that produces precision skirt profiles. This new Digital Diamond Profile (DDP) technology creates a unique barrel profile of the pistons, promoting an oil wedge between the piston skirt and the cylinder wall. They feature a newly designed ring groove geometry using Thermal Arching Compensation (TAC) that machines the piston ring grooves with an uptilt to offset thermal arching distortion. This squares the ring face up to the cylinder wall for increased power and decreased oil consumption. The Speed-Pro Digital Diamond Profile hypereutectic pistons feature the next generation of Duroshield skirt coating, reducing friction across the entire rpm range and increasing wear resistance for longer life and superior noise and vibration reduction. They also use precision-machined piston pin bores that allow for either fixed or floating wrist pins. The pistons come weight-matched to a 4 gram (+/-2 grams) maximum variation within every engine set.
This kit includes the set of eight pistons, and Moly Rings
***Be sure to note size of pistons and rings required***
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Federal Mogul/Speed Pro Piston Part
Number
|
Application |
Power Range |
Special requirements |
Compression information
|
Ring groove size
Pin diameter
|
Rod length
Stroke
|
Deck clearance
Skirt clearance
|
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H581CP STD plus moly piston ring set (Hastings/Perfect Circle/MAHLE) P/N H581CP-KIT - We also have other piston sizes available.
|
Chevrolet 454 - 4.250" bore (at STANDARD)
Domed head .340" high (30cc) w/2-valve reliefs. DurOshield skirt coated piston.
1970-76 Car (USA)
|
idle to 7000+rpm |
Good for street or race/nitrous to 150 shot |
1.640" compression distance
Approx. Compression (w/.030" bore):
w/106.9cc heads 11.46:1
w/116.9cc 10.41:1
w/119cc 10.22:1
|
5/64" 5/64" 3/16" ring grooves
.989" pin diam. - pins included
|
for stock length 6.135" rods
Press-fit or floating
Stock 4.000" stroke
|
.025" deck clr
.0015" skirt clr
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Chevy 454 7.4L V8 Hypereutectic Replacement Piston. Bore 4.250, rings 5/64-5/64-3/16, Press Fit or Bushing Pin .990. Domed Head .340 high w/2 Valve Reliefs.
