Quote:
Originally Posted by Big Dave
Given the fact its a flathead engine, I do'nt know if that exhaust manifold is as bad as you think. It will probably flow more than those six Briggs & Stratton cylinders will put out. Once you get it running, try drilling a hole in the manifold and see how much back pressure is being generated. I'd bet it isn't much.
Go to a hot rod show and find a car with the old Ford flathead V-8 and see what headers they used.
Also, those "saddles" on the block might make it tough to put any halfway modern headers on it.
|
You are right in that it doesn't need to be very efficient being the rest of the engine isn't very efficient anyway!
And it is true the flat head Ford didn't have a very efficient manifold, but neither did most engines back then! Look at a Cad V8 even up into the sixties, they had a horrible exhaust manifold. But as soon as any of these motors were set up for performance those stock exhaust manifolds went in the trash and they got a header pretty much like we see today.
Brian