Quote:
Originally Posted by 694.1
Having used a ceramic coating on the exhaust manifolds on couple of engine, it can really lower under hood temps.
Not only does the manifold operate cooler, it reduced heat soak into the head. And it looks great.
Something to consider.
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Thanks to this forum, this "Mopar guy" learned fairly early on that the cast iron exhaust manifolds on our 421 are Ram Air 2 manifolds. According to what I have seen on Pontiac cylinder head charts, the 777 heads are for HP 389 and 421 engines in 1965, so that all makes sense, and because it has one of the "better" cast iron manifolds, I haven't insisted on headers.
I put TTi ceramic coated polished headers on my 440 6bbl even though it had "HP" iron manifolds, they didn't appear to be as performance focused as the RA2 manifolds.
Seeing the indentions where the RA2s look "segmented" into individual runners was a plus. I don't know about getting them ceramic coated, but I'll see how much that would cost.
Any suggestions as to who to use to do that?