Built 454 jb12 pump does 80mph west sac. Sent from my iphone using socal jet boats from my experience with james, he is the guy to go to. from high hp applications to pump gas cruiser motors he has you covered. I have a 1973 nordic jet boat with a built 454 full roller motor, tunnel ram, dual carbs, rectangle port heads, upgraded berkley pump, jetotvator, bimini top, stereo(2 15" subs and dual amp), 2 brand new batteries,and more.
It was a .060 over mark4 454 with gm 990 heads (larger intake values and port work), and a tunnel ram with dual 660's. the cam was done by chris straub here on the forums (cstraub) and the engine ran hard.. And then there is the jet boat. getting the tired old 454 out of the boat was easy. swapping in the lq4? not so much. “the most difficult part was the exhaust manifolds,” says jeff. “they are ford 351 units, and are almost like finding unicorns.. Welcome to the jet boat tech page 2. the build up . after getting the housing powder coated black (not shown in pic) it was ready for assembly. i obtained parts from hi-tech performance and used the ultimate wear ring along with a new style packing seal. here is the berk pump that i assembled..
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