00 black ss

iTrader: (9)

im building a 383 with stock 243 heads. i want it to be pump gas friendly so what would the max compression ratio need to be? im going with a big cam like a ms4 or the eps 238/248 cam. what size piston should i go with? i want to stick with wiesco or diamond since i am going to be spraying it. thanks in advance.

brooknasty

iTrader: (1)

From what I read and hear an ls1 block can only be bored out to .100 safely. and compression no higher than 11.5

white84z

iTrader: (1)

Do NOT have your block bored out .100, that will ruin a perfectly good block. Most 383 kits end up in the 11.3-11.7 compression ratio and run a 3.905 bore.