I'm in the "design phase" of a new engine for my current 2nd gen or possibly to go in a 3rd, but its going to be a twin turbo 468 roller motor. I was wondering about what some other people have done for exhaust manifolds entering the turbo...

did you use log type manifolds or did you buy/make tube headers? I know I would benefeit more from the tube headers, but the log types I could make myself, and do it very cost effectively.

Thanks,
Cale

 

I'm using a set of Gale Banks tt sbc cast iron manifolds. Turbos are driven more by heat energy than they are velocity, which is one of the reasons iron manifolds aren't as much of a drawback as they are on non-turbos. If you do make headers, keep the pipes short and coat them to keep the heat loss down. Sorry, I don't know of any off the shelf BBC turbo manifolds.