Porting Edelbrock Intake Manifold

Conclusion
First, I'd say we can discount the idea that a 58mm throttle body is too large for a stock cube motor. Though its average horsepower suffered a little, its peak was higher and it did not manage to kill the torque like many have suggested. Since these gains would have only increased with a larger cube motor or forced induction, it also gives the motor room to grow. Second, despite the fact that the roller rockers were the stock 1.5 ratio, they still managed to pick up power just through valvetrain dynamics. Never underestimate how much power friction and weight can rob from your motor. Lastly, Edelbrock put in a valiant effort with the LT1 Air-Gap intake manifold, but for a 350 to 355-cube motor it is hard to beat a stock or modified stock intake.