well i bought a ls block with ctr pistons and im thinking of using it...only thing is i know pct pistons in a ls with b16 head shoots cpr way up in the 13's i think...pretty sure...now my question is to get cpr in a more safe and streetable zone say 12.5 maybe even 12.1 how oversize would the headgasket have to be...i was trying to get all specs to calcualate myself but it seems people have alot of confusion and i know the cpr calculators are wrong...if someone could give me the specs i can calculate on my own if not is someone wants to help me out lol and hook me up that would be nice too...thanks guy...alex

 

IMO.

Sell the pct piston's. buy some p73-00 or p30/pr3 and call it a day.

 

i was thinking the same thing but i dont know...i mean its been proven that u can make power with them but then again the dome has been brought up and flame travel and what not...this is my daily driver so im not trying to hit some crazy numbers...the bottom end is going to be on stock rods oem bearings and it has a z10 girdle...up top non ported pr3 with springs retainers and skunk pro series stage 2's...anyone else have input??

 

My C5 PCT .25 over block is super reliable! And you should be around 12:5 compression w/ the ls short blockk, just run an oem 3 layer head gasket.