[rswannabe]

Looking for some guidance. I have an internally stock ‘91 964 3.6 motor running itb’s and headers. Current cams are stock and I’d like to go bigger without changing the pistons.

I have read that the GT2 Evo cams work very well in stock NA 3.6 and are about as aggressive a cam as will clear the stock pistons without additional reliefs. So when I saw a set being sold for a good price in the classifieds, I picked them up. They arrived and look to be in good shape with no significant wear or pitting. BUT, they are on a 107 lobe center instead of the normal 112 lobe center for GT2 cams. This was not mentioned in the ad. The narrower lobe center means more overlap at TDC and less clearance. So I don’t know if these will clear the pistons.

Is there a way to tell if these will clear the pistons short of tearing down the top end and measuring? Anyone run these in a stock 964 and can confirm they clear? Other ideas?

Thanks!