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Poor Performance under load

Inkleyc

New member
I have an 87 Supra Ski with the ford windsor 351 in it. Two years ago i started to loose compression so we rebuilt it. It now runs great and the compression is good. When i run it out of the water i get response on RPMs, but when in the water i can only get about 3200 RPMs when i open her up all the way. What could be causing it to preform bad under load?
 
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