1970 Duster AlterKtion, 4 Link, LS/T56/Turbo and Minitub

Yea I agree the turbo can make more on a different combo. A good friend of mine is running that exact same vs7875 billet wheel turbo on a k24 Honda in a pinto wagon and makes well north of 800. But it may be not enough turbine for your cubic inches and fall off fast as backpressure rises. It’s all about efficiency in a specific range. I do agree with you that at 21 pounds you should be making more power but I’m guessing heat and backpressure are your enemies. As they always are. Was Pete monitoring exhaust backpressure or intake temp?