Absolutely not, I agree, we got off on some good bunny trails thought! I think we all tend to go with the flow of the thread, almost Ralphlike...
I haven't take a look at the 4.1L stainless, if they are like the Olds 5.0L "Y" stainless, they might be a good choise if they are a bolt on. For Olds, they only work on 7A heads with the tiny exhaust ports (althought they DO have the more desired fully divided center 2 exhaust ports, which is rumored to pick up 30 hp on an modifed engine, I would guess more like 15 myself....). A little trick to manifolds is to go too big on headers or manifolds to allow a block to reversion. The exhaust pulse is larger once it gets in the pipe, and then when the pressure pushes it back or the cyl tries to suck it back, the pulse will get partially stopped at the port exit. free power though less diluted chamber. Ok, NOx might go up slightly, but who cares, right?
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Originally Posted by illumina Thanks again for the info Tom. I am sorry if I sounded like a jerk with my last post, which was not singling anyone out, I was just a little buzzed and was wondering where I am getting with this project I have been promising for close to a year now...
I was checking out that 4.9 buildup thread and I seen the most interesting thing that I would like to use. They had a set of 4.1 liter exhaust manifolds in the picture that appear to be stainless, and they are the same material that I have on my '87 Seville, only those are made for the cross-under pipes. I'm just not too sure how the flow would work out should I decide to use those instead of the cast iron manifolds. I have a set of Deville exhaust manifolds laying around along with a cross-over, but they seem to be the cast iron manifolds. The cross-over is stainless I believe...I would much prefer the header look of the 4.1 liter manifolds as well. |