maxing out pre turbo useless? Oh I don't quite think so. Look at my above quarter mile time, put the numbers in a estimated hp chart for quarter mile trap speed, and you get 90 hp based on 3700 pounds car weight. I weighed it at a junkyard. Granted it is an estimated hp, but thats nothing to sneeze at for a non turbo 616

I do have to agree that I am getting close to maxed out at this. Headers may help some, but no point in doing them if I put a turbo on. Could port the heads too. Has anyone flow tested these heads? The biggest surprise was how much I gained with reaming out the pre chambers. This has got to be of use when adding a turbo. And of course my ip adjustments are a good start for the turbo. May well need more after adding the turbo. The new intake manifold I made will not carry over to a turbo, so perhaps you could say that was wasted. For me a lot of this is worth it just to see what can be done. I like to try things out.

Thanks for the word on cams. good to hear that regrinds should be ok.

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1977 240D turbo