Did an chevy vortec 350 swap in my 97 regal 2100 lsr (21' fastrac hull in board). Vortec heads, edelbrock performer intake and holley 660 cfm carb(tried a mercruiser 750 cfm carb before and did the exact same thing) with delco est voyager ignition system. Its runs great on land, starts right up and idles nice. Revs up to 5500 rpm no problem. When i get it on water itll run just as good until half throttle or about 3500-4000 rpm. After about 3500 rpm it wont go any faster and itll still rev only up to 4200 but it'll go slower at high rpms. I can do 65 kph alone but with 5 ppl it wont plane and i can do about 20. Im running an alpha leg with 1.84 gear ratio and a 21" pitch 4 blade prop. My fuel pressure is steady around 6 psi. The timing is set to 12 degrees idle and advancing but only up to 26 degrees but that is because the delco voyager has a pretty flat timing curve so i know it is still functioning as it should. And i know the prop isn't spinning, checked multiple times. Im all out of ideas at this point. If anyone thinks they can figure it out id be very grateful. Been to the lake 5x trying new things and never got it to run right and summer is half over.
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