Re: rol231-Shorty Headers
I agree with you ROL. When I went to a free flowing intake and exhaust on a 351M (Edelbrock/Holley600 and 3" 4-tube headers), I was very concerned about loss of low end (I run beaches, and pull at idle). The comment about exhaust components behind the headers is very insightful. I ran 2-1/4" pipes to increase backpressure (since I have glasspacks and no cats) to maintain low end. The larger headers (they are ceramic-coated) help lower head temperatures, and , yes, flow a he** of a lot better at high revs (with stock heads), but the "restricted" exhaust pipes seat the exhaust valves and give great low end. I've had more than a few comments from mechanics about how this is the first free-revving 351M they've seen in a truck, that has low end response. I just stumbled across the setup, so no credit here! Just fuel, air and spark!
I hear so many folks screaming for an open 3" exhaust, then complaining about loss of torque. Go figure.
'86 Trooper II