I'm still undecided on whether or not to stick with the stock exhaust
manifold on my 4A, or go to a header. Kaster (in the Comp Prep Manual) says
the header is good for a 6 HP increase on a hot street engine, throughout
the power range. However I believe he is talking about the pre-4A manifold,
and the doesn't say anything either way in the 4A update section. I've
heard that the 4A manifold is supposed to be superior to the previous ones,
but is the header still better? The one downside I've also heard with
regards to headers is that they increase the temp under the hood (and being
directly under the carbs and intake manifold probably makes it worse). Do
ceramic coating help? I don't really like the looks of header wraps, so I
probably wouldn't do that.
--
Darrell Walker
66 TR4A IRS
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