Just got the intercooler installed. Turned the boost back up to 15psi and tuned the carb to it so it stays nice and rich. Runs like a top but is ruining the block. The rings are taking a beating and blowby is becoming a lot more apparent. The oil still looks pretty clean though so I don't think I've broken anything. I'm saving up to finish rebuilding that other block and I found a set of apparently forged pistons for my 250. They're from the later era with the integral head and it has "0.015 higher compression distance but I don't know if that would be enough for it to hit the head when it's all bolted on. It seems like it wouldn't be a problem with that thickish fel-pro gasket with the metal rings built in and it would just raise the compression some.
Those pistons will work, they are lower than stock compression pistons I used them & they did not blow apart. I do not like that the top ring land is exposed as compared to your stock piston, but it is forged & they are a lot stronger than your stock pistons. Congrats on the intercooler install. But,,,,, I do not understand why you decided to go back to 15 psi on pump gas & not having any boost/timing retard devise,or have a methanol injection of some sort.
Your pistons are most likely shot, rings lands broken & broken rings.
Questions, after adding the intercooler & all that piping, did you notice any more turbo lag, takes longer getting into boost?
Does the engine run any hotter having that big intercooler in front of the engines radiator?
What is the actual intercooler you bought? Specs, bar & plate correct?
