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If your thick enough, then keep sanding

wetsand and polish polish and wax should be done every year I would spray gel prior to spraying paint.

welcome aboard best way is to spray with duratec 904 additive and it lays down like paint did 3-4 layers on the boat in my signature that way prior to sanding. even then, I had to sand (using a DA) with 320, 400, 600, 800, then cut-n-buff However in your case, I would sand completely with...

I would be tempted to switch to vortec heads since you have to buy an intake. good for an honest 30hp on the 5.7 your looking for the edelbrock 2506 vs the 2516 (vortec)

glad you got to the bottom of the problem

Teleflex became SeaStar. look up the same at SeaStar

just realized, you have a 1986-1995.

couldnt have looked too hard - $490 and if you call summit, they will match price https://marineenginedepot.com/edlebrock-intake-manifold-50l305ci-to-57l350ci-performance-with-brass-lining

No, and you answered your own question.

Your minor changes to the SBC won't get you to 50MPH while only turning 3500 RPM unless it's in a truck pulling the boat on a trailer Based on only turning 4000 RPM at WOT in past, you're lugging the motor. Lugging a motor kills them. Prop the boat so the motor turns 4800-5100 RPM at WOT...

Yes, auto makers now make plastic intakes, plastic oil pans, valve covers, timing covers. For a vehicle that lasts 4-8 years it's not a problem. However in a boat that lasts 15+, it's a real issue One of the many reasons I prefer to refurb/rebuild vs buy new Luckily the aftermarket SBC...

Boat that big needs a bravo and a big block. My guess is the drive is at its limit with that large a boat

Welcome aboard. Not familiar with all SeaRays Check if there is a deck panel above the fuel tank Also, SeaRay's website has some manuals. Assuming the tank is directly in front of the motors

Also drain the big J hose

1996 and later motors went plastic. Aftermarket solution is aluminum

Boat without paperwork is a yard ornament

Look around, you can find them for less

Did you stick with plastic or go to an aluminum cover?

And the block-offs for the back of the head. I have never found an epoxy to hold up and ended up getting a marine manifold. POR15 used to advertise an epoxy, however their product has been crap since 2008. Edelbrock (made by Barr castings) has marine manifolds that are nearly identical to the...

Because even in fresh water the manifold will corrode. Not as fast as in salt, however it will still corrode You can run an auto manifold if you have a heat exchanger