Quote:
Originally Posted by LT7A
The owner of the local high performance shop that does some of my work has cautioned me that aluminum heads actually pull energy out of the combustion event in the form of heat. He says that installing aluminum heads without increasing the compression ratio about a point will actually net a drop in performance. If that theory holds, then maybe you have increased flow etcetera, but then were balanced out by that factor.
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Very good point, but I'm not sure it's a full point difference. No pun intended.
I have to think the single plane manifold isn't delivering in the RPM range where the engine spends most of its time. But, hey, it sounds like a nice dual plane may be in Rusty's future.
If Greg is into black, he might want to jump on this deal:
https://www.ebay.com/itm/Weiand-8120...MAAOSwzRFaVUXh
I have bought several "scratch and dent" parts (actually new and unused) from Holley's eBay store over the years, and the guys who run the store are very good to deal with.
Or wait until a standard-finish 8120 manifold is up for sale. I got one 3 years ago for (are you ready?) $79 including shipping!