Whats a relatively safe limit on these stock 6.0L blocks in n/a form. Ive only really paid attention to turbo stuff in the past.
Depending on the amount of core shift, iron 6.0 blocks regularly go 4.125" for an N/A build. 4.060"-4.080" is good for boost.I plan on at least 850hp na. Very good factory block. I wouldn't go more than .030 over on the bore.
Are we talking the LSX or LQ4/LQ9. I've always read 4.060 over on the LQ4/LQ9 factory block was really pushing it. The LSX block is a totally different ballgame.Depending on the amount of core shift, iron 6.0 blocks regularly go 4.125" for an N/A build. 4.060"-4.080" is good for boost.
The block in raw form at 4.060" is good for 1200-1300 HP. Filled, they're good for 2000+.