grey motor crank

[john253a]

just wondering what the safest compression ratio is to run on a stock 132/138 grey motor crank, with out stud girdles,

hoping 9:1 or even 9.5:1

[john253a]

got myself a turbo that im going to try and fit, on the stock block until im ready to strip down propley
with a staic comp of 7.2 factory if i add 4 psi ill be around 9:1 and 5psi 9.5:1

ive seen a few running high 9's but not sure on the reliability,

just want a bit more up and go, nothing to wild