This is a comparison of a stock-port 6-port and a very mildly streetported 4-port. I only compared the torque curve as it is a good measure of charging efficiency.
Please note that while the 6-port is considerably lower, it is a much flatter torque curve than the 4-port. You can see that even a tiny bit of porting will hurt the low end torque.
** The 4-port is ignition energy limited past 7000 rpm, otherwise the curve would probably be flat to about 8500
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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)
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