Originally Posted by
Graham there nothing particularly difficult about the exhaust cam when dialing it in by degrees, it just goes against what you are used to doing ie BTDC rather than ATDC and the lobe the other side of the follower compared to the inlet, so when you want to change the timing a fraction you go the opposite way to what would you do on the inlet.
30 something years ago when i first started learning about building performance engines i work with two engine builders both had been doing it for donkey's years, they always ended up with the same dilemma with twin cams ( lift at TDC method was un heard of then) when over 99% of performance engines you dial in are single cam and so you never even look at exhaust timing, you get so you can do inlets with your eyes shut, exhausts confuse the brain!