Is 16% average, below average, or above average - I don't have a point of reference to know if it is good or bad. Thanks. Not sure what casting number the heads are, I think 1973 vintage off of a Lincoln or T-bird.
I have a oil leak on the front and rear valleys of the intake. I need to take it off and put a new gasket set on because the leak is pissing me off. Since I am doing that I am strongly considering going to a Stealth dual plane and not putting the Torker single plane back on. To do that I will have to cut a hole in my hood and find some type of scoop and air cleaner combo.
I went to the muffler shop today and had a good talk with the "man". He was glad I would bring the mandrel bent over axle pipe and didn't see any issues in reusing the mufflers and insuring I get 2 1/2" from front to back. Not leaving any 2" inside the muffler or ball clamp on the collector. I ordered the pipes and should be here middle of next week. By the weekend I should be able to get the car and pipes to him.
16% is about right with a c6 im afraid. I did a light weight rotating parts c6 and roller bearings and it made a big difference but for a stock c6 15% is about right.
That cam is not bad but it doesn't give the exhaust any help and with the tiny exhaust system it only made things worse. I wish you the best of luck with your combo. I like the stealth and the ones I've used on 460's have worked good but with more than normal carb for the application. Fixing the exhaust may satisfy you without any other change.