who runs 13sec to 12.80 in the 1/4

i get you and here is the info on the pistons

Federal Mogul/Speed Pro Piston Part
Number

Application Power Range Special requirements Compression information
Ring groove size

Pin diamater
Rod length

Stroke
Deck clearance

Skirt clearance



H405CP030 and a FREE set of Perfect Circle 50564CP030 rings



Magazines get $144 a set for the pistons alone $18.69 ea.
360 Chrysler 4.030" bore 1967-2003 flat with 4 valve reliefs


idle to 6000+rpm Good for street or light race/nitrous to 75 shot 1.637 compression distance

Approx. Compression (@.030"):

w/63cc heads 9.11:1

w/65cc heads 8.94:1
5/64" 5/64" 3/16" ring grooves

.984" pin diam.
6.123" rods

press fit only

3.580" stroke
.050" deck clr

.0015" skirt clr