Velocity stacks help but its like 1-2whp tops. Believe it or not stock BB4 lude induction system with k&n panel filter or aem v2 are for the BB4 are the most power on an engine producing less than 240whp. Realistically you dont even need a pipe more than 15% larger than your throttle body, otherwise it is a bottle neck. As far as the issues check valve adjustment. It should be .007" on intake and .008" on exhaust. Or .178mm/.203mm metric.
I've also had better luck with accurate valve adjustment when ect shows 100deg. If the valve adjustment is right, re-check timing. You may be off a tooth. On a side not that gear ratio chart is a little inaccurate. A T2T4 has a .787 5th. Im not sure about the rest of the ratios. Good luck with the rest of the build. You're putting in a lot of work and I can relate and respect that.
I've also had better luck with accurate valve adjustment when ect shows 100deg. If the valve adjustment is right, re-check timing. You may be off a tooth. On a side not that gear ratio chart is a little inaccurate. A T2T4 has a .787 5th. Im not sure about the rest of the ratios. Good luck with the rest of the build. You're putting in a lot of work and I can relate and respect that.
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