nwav8tor wrote: ↑
Nov 22nd, 2018 4:13 am
As for the exhaust manifold, I am considering switching to headers, especially for the sound and somewhat for the performance gains, but am worried about increased heat in the cockpit.
I had both Hooker standard and then Hooker chrome side exhaust headers on the '68 small block and I did not have any issues with heat in either case. If you get the headers with ceramic coatings, they are far cooler to the inside of the engine compartment than standard headers.
I bought new Hedman headers for the '65 small block directly from Hedman. They shipped them directly to Jet Hot where they coated them, inside and outside, then shipped them to me.
The headers I bought for my '68's new 454 are Hooker and they were available in chrome (hottest), standard (medium heat) and ceramic (coolest) right from Hooker. If you can't get them new with ceramic, you can have them coated, as long as they have never been used.
You must be aware though, you cannot do the initial startup and break-in a new cam using ceramic headers, as the excess heat during initial startup will damage the ceramic coating. Why, beats me, but it will.
I broke the small block in with the headers that were on the car before I re-built the engine, then installed the ceramic headers.
I bought a set of used big block headers for the 454's initial startup, of which I will sell after that.