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NoDOHC · 01-10-2011, 07:28 PM

I usually pound them up as much as possible with a punch and hammer (until they are tight against the housing) and then polish them to 600 grit or so (minimizes radiative heat transfer from exhaust gasses, improves flow, makes slightly louder).

Constantly increasing cross-section is your friend for the exhaust.

For the intake, don't bring the port up any more than you absolutely have to if you intend to keep some semblence of low end. Raising the far edge (furthest from the housing) gives much greater performance improvements than raising the near edge and you can raise the far edge quite a bit without changing the port timing.

01-10-2011, 07:28 PM	#18
NoDOHC The quest for more torque Join Date: Sep 2008 Location: Sheboygan, Wisconsin Posts: 855 Rep Power: 17	I usually pound them up as much as possible with a punch and hammer (until they are tight against the housing) and then polish them to 600 grit or so (minimizes radiative heat transfer from exhaust gasses, improves flow, makes slightly louder). Constantly increasing cross-section is your friend for the exhaust. For the intake, don't bring the port up any more than you absolutely have to if you intend to keep some semblence of low end. Raising the far edge (furthest from the housing) gives much greater performance improvements than raising the near edge and you can raise the far edge quite a bit without changing the port timing. __________________ 1986 GXL ('87 4-port NA - Haltech E8, LS2 Coils. Defined Autoworks Headers, Dual 2.5" Exhaust (Dual Superflow, dBX mufflers) 1991 Coupe (KYB AGX Shocks, Eibach lowering springs, RB exhaust, Stock and Automatic)