Quote:
Originally Posted by Ol' Ron
Not sure why you want to use headers? They have no affect on performance. The do increase the heat in the engine compartment, and can be quite noisey in the passenger compartment. AT one time there was a cast iron exhaust manifold available that made this an easy conversion. You might get a copy of jWL's book.
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That's an interesting observation. (that they have no effect on performance)
Are the original type manifolds that good that no improvement is possible with
headers? Or is the flow so bad out of the engine that it doesn't really matter
after the port because the port is the restriction?
You'll have to school me on this. I worked for a place that built the Robert Yates practice engines and we knew exactly what the effect of changes in "A" or "B" or "C" did in the exhaust side.
I will say this, if radiated heat in the engine compartment is a concern because of headers, you can always thermally coat them (inside and out).
That will definitely bring the temperature closer in line with what you'd see
with standard cast iron exhaust manifolds. A similarly coated cast iron header would definitely put the heat out the exhaust more so than an un-coated cast iron manifold.