[rswannabe]

So, I finally got around to test fitting these GT2-107 lobe center cams in my '91 964 3.6. It is tight, but they just barely "fit". My Reserarch told be the rough timing should be about 3.45mm. I installed them timed as such, and then checked the clearances by dialing in the valve adjustment screws on the rockers. The exhaust valve clearance was looking Ok with better than 2mm of clearance (full 720 rotation), but then I was not able to even get 1mm of clearance on the intake valve. So I gradually dialed back the advance (retarded the cam timing) until I got to 3.05mm (0.120"), where I was seeing 1.25mm clearance on the intake valve and 1.75mm of clearance on the exhaust. This is less clearance than I would like, and some would consider it not enough clearance, but I'm going to give them a try. This is partially because upon pulling my stock cams I found some not insignificant pitting, and partially because it would be over a month wait on a new set of DC24's which would be my go to alternative.

So I think I'm going to run these cams and see what it feels like. I'll do some tuning and have a dyno session schedule for next month to complete any tuning and see what the impact of the cams are on my motor.