So just recently I aquired a full vband forward facing 6466 setup with the intention of making some power. Last season I had a twin scroll 6266 setup that made just shy of 600whp on 94oct pump gas. I had planned to switch to the bigger turbo and E85 this season. After talking to my tuner he had asked me if I knew what the rod/main bearing clearances were in my built motor. Unfortunately I bought the car with the built engine and didn't have those details. This has got me thinking lately and I am now paranoid that the engine will not be able to handle the kind of power I was planning on making... (700whp++) I contacted the builder of the engine and he didn't have much on record since the engine was built in 2010. Anyways he told me that the bearing clearance would have been set to 75-80% of the upper manufacturer spec. Parts wise I am confident that the internal components of the engine can handle the power I am looking for, I am only now skeptical about the bearing clearance since my tuner brought it up. Should I be worried about this or am I crazy? The engine has probably a little over 10k on it now running strong with no issues. Just wanted to get some opinions on whether I should just tune it on pump gas and keep it conservative or should I just go for my original goals and hope for the best? I plan on doing Black stone oil analysis frequently to monitor whats going on and possibly catch any problems. Any advice is greatly appreciated.

 

I think you already know the answer to this...if you don't know for sure where they're set, it's a gamble.

 

I would only be worried if dealer bearings were used. which virtually no one does because they are far more expensive than aftemarket bearings. aftermarket bearing are loose. plus with 10k on it. I wouldnt be worried at all.