Just a question, not arguing. I've always heard that a wide LSA (112?) is better when using exhaust manifolds. I understand advancing the cam to get the DCR up on a low compression engine but, why the tight LSA? Is it for a choppy idle?
Just because the cam is on a tight lsa, doesn't mean it has to be huge. The comp XE on a tighter LSA would be something I'd consider. You could use it as is and install it at 102 if you wanted. It's not going to be making any steam above about 5K anyways with the heads/intake/manifolds, etc.. I was in no way endorsing the use of either hughes or comp thumpr cam. It was an example of what I've done on multiple ocassions when dealing with low comp engines and camshafts that were "too big" according to most folks. Size it a bit smaller and install it way ahead.
Yeah wide LSA seems to work better for iron exh. If you have a wide LSA, you need to be careful with putting exh lobes out of bounds when advancing the cam to get an earlier intake closing event.
I wouldn't be smacking a 230ish at .050 cam in that engine without some serious thought about drawbacks.
