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400 small block piston choice

7324 Views 6 Replies 6 Participants Last post by  rich1978
I have a 3951511 stock bore 2 bolt 400 that has stock dish pistons,crank and rods. I want to build this for a nice street manners motor . I would like to change the pistons to Speed Pro hypereutectics H615cp which have a comp. hgt. of 1.425 and change the rods to 5.7 . The block has not been decked; so I'm assuming I have 9.025 deck height.I want to see if I'm calculating this right so bear with me.
Stock stroke:3.75 /2 = 1.875
Comp.hgt of piston: 1.425
Rod length: 5.7
Total: 9

Should leave me .025 in the hole right?
Piston's have a .135 dish w/4valve reliefs. Will run cast iron Darts w/64 cc chambers.
Any experts out there let me know if I'm correct . Thank's in advance for your help. Don
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Many thanks to Don and the rest of the posters, as this thread is right on point for me. I'm hoping to build a Dart SHP small block with AFR 180cc heads and hypereutectic pistons. May even go with Dart's short block, which includes them. In any event, the info posted really helps me in considering--during planning stages-- a ballpark compression ratio before purchase of any parts to measure.

My question is whether I should hold off buying the heads to see what the real measurements are on the SHP short block(If I go the short block route)?

Thanks, again!
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