Lawnboy

iTrader: (54)

Diamond 382 blower pistons 10.0 compression???

Why is this , diamond's LS1 3.9 bore 4" stroke 382 blower piston is 10.2 - 10.5 to one compression , depending on what head your going to run.

I decided to go with a callies compstar crand over the stocker , and was thinking on going 4" and a 382 , but there pistons with only -7cc will leave me with a high compression .

there 347 3.66 stroke blower pistons and perfect with 9.2-9.6 to one compression

well if anyone knows why they offer a piston with such high compression for forced induction let me know,
and if any one is running them.

RAGENZ28

iTrader: (5)

Call them and see if they offer one in a lower compression range.

If you're going through the trouble of crank rods and pistons why put back in high compression if you're going blown?

If they don't make any look at another company.

Besides you can run a lot more boost if you get it down to 8 or 9 to 1.

10.5 -1 would be great if you're blown on alky but I doubt that's an option

JPH

iTrader: (2)

it's the 4" stroke, that's hurting you. You will need larger chamber heads to help a little, or have a larger dish in the piston (like -16ccs or so). Call them, I'm sure they have done something like your set up, that's not in the catalog. #1-877-552-2112