Ed) Primary sizerefers to the inner diameter of each header tube. In the Chevy V-8 realm ... primaries for 210-240 cfm exhaust flow1 7/8-inch primaries for 250-275 cfm exhaust flow2-inch primaries ...

Whether it's a 632 in a Chevy ... race headers, where surviving inclement wheelstands is as important as making maximum power. Here's what Lemons has to say regarding header design, exhaust ...

Big pipes and a throaty rumble are what street machines are all about, but it's not just about the sound; an exhaust ... tube headers (PN 2207-1HKR). These are designed to fit '68-74 Chevy Novas ...