Harold Johnson, Spitfire headers,Whats his Number?

cavemanmoron said

Stock 273 manifolds are a lot less hassle.

On a street driven car, with a mild engine, headers are not worth a lot of power.

http://www.moparmusclemagazine.com/...pp_0307_mopar_crate_engine_exhaust/index.html

Looks like about 16 hp on a 300 hp engine.

To me $1000. for 16 hp was not worth the hassles, on a mostly street driven
car.

Click to expand...

early abody 273 manifolds on something with a 360 head will choke the hell out of the motor. been there done that, i'll bet its more then 16HP. ever see how much smaller the ports are between a 273 and a 360? that test used 318 - 360 manifolds not a tiny little early abody 273 manifold that is not only tiny as hell but also has that stupid bend in it..