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Never did mess with the l28 turbo engines, I felt that the N/A engines were already pushing the limits of controllability, at least for me. Had some friends in Ft lauderdale who had some 350hp monster 28t Z's running around though. They reckoned 400 hp was possible.
I almost forgot to pass this on. If you are having carb trouble, find a pair of 175 Strombergs ala TR-6 vintage, they bolt right up to a 240/260 manifold, and work very well. Great for keeping your car drivable while searching for early Z SU style carbs.
Gotta go ,all the best. Rich
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