Looking to see if anyone has gone .60 over. Did it run hot? Any other issues? I know people SAY .30-.40 is max and some SAY .60 if fine. Machine shop called and said they need to punch out .60 to get rid of the ridge. No sonic test has been done. I did search but but not to many people who have done it have weighed in. Maybe that is sign lol.

 

I am at 60 over(not by choice) and boosted, so far no problems and it was a daily driver. I would be leary of going 60, at the time I couldnt find a block and had been waiting for a very long time to get mine complete out of the machine shop so I said F it. others may chime in, but I guess depending on the build you might be ok..

 

IMO you are rolling the dice if you don't get the cylinders sonic checked if you're going with that size bore. If there is enough material then do it.

 

I would find a stock donor block and have it .030 over

 

Live dangerously, go 0.060, unshroud the valves more, and report results. Grab a 3.85" crank and be a 402.

 

Well looks like no one down here does sonic testing so I think I'll wait for the motown block to go 400ci plus. I have and extra 96 iron head Lt1 in the car with a spun rod so that will be coming out to go to the machine shop.

 

Hit up fergymoto or look for his ad in the classifieds, he's selling a bad *** LT short block, IIRC its a 396 for boost, don't quote me on that though.