mike tkach

iTrader: (3)

if your ig timing is low it will be a mutt.160 cranking compression with those heads will like 34 to 35 deg total advance all in by 2800 rpm.verify timing,then test with the 17 pitch prop.let us know the results.

SB

iTrader: (1)

COMP Cams#249-12-240-4
1600-5800 RPM
Duration Advertised: 270° Intake / 286° Exhaust
Duration @ .050'' Lift: 226° Intake / 236° Exhaust
Valve Lift w/1.5 Rockers: .480'' Intake / .489'' Exhaust
Lobe Separation Angle: 112°

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Should have figured on the cylinder head. Pro-Fraud / Jumk.

Anyway, 210cc heads are for super stout 383's and bigger.

Your 350 better have close to 10:1 compression (Min of 9.5:1) with that cam and cylinder heads. Heads still wouldn't be ideal size wise......but.........won't totally kill you.

Intake, we went over - throw that out.

Edelbrock carb - size is fine. Many out of the box have had issues with secondaries not opening all the way..you need to verify this.

Exhaust - you'll hear many comments on this. Not a good choice with that cam either. A smaller cam, which will be better for that engine, will be better for that exhaust.

Did you up your fuel system ? Get rid of the antisiphon valve and get a Holley marine mechanical pump. Rest of fuel system should be okay for your power levels.

Flame arrestor. Minimum of 9x4.

Timing. 34 Max should be fine. Start with 32 to be safe.

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There you have it.

Again, a bunch of flyin small blocks around here. Even upper 60mph mild ones to 80 and almost 90mph wild ones.

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Since you said you can take the criticism, I will say, your parts combo really kind of sucks.

Let's see what we can do with it without changing big things and/or big labor intensive ones.

SB

iTrader: (1)

Sometimes.

Example: put 330HP in a 22ft Velocity and you'll hit 70mph and change. Most other small performance boats will get into low - mid 60's.

Also, there are many boats out there that will not go faster than a certain mph no matter what power you put in them.

hp is a huge factor.
Prop is a huge factor.
The boat itself is a huge factor.

konst406

Ouch, LOL. Yes, those were cheap heads.

Carb: Yes, went through carb and adjusted it. Floats were way off.

Fuel: Yes, went to a 110 GPH pump regulated down to 6. And got rid of the anti-siphon long ago.

Flame Arrestor: Yes, had room for a big K&N marine set up. Don't remember size exactly but larger than 9x4 for sure.

Exhaust: Looking for a little bigger boat so not going to spend the $1000-1500 I have seen good exhaust go for. Going to stick with what I have.

Timing: Will be the 1st thing I do to see what happens when set up. Going to pull the distributor and go run it at the local bench to see what it's at for sure.

Again, thank you for all the input guys!!! Your knowledge is helping!!!

SB

iTrader: (1)

Pic shows what a 85 4Winns Santara looks like.

the deep

iTrader: (8)

1988 Four Winns 210 Horizon - 383ci 68mph radar .

tommymonza

So what is the economical fix SB?

Install some Vortec heads and a daul plane intake and than go to a smaller cam to work with the compression and exhaust he has.

And of course still observe the secondaries and correct the timing.

SB

iTrader: (1)

SB

iTrader: (1)

1st question: Do these Procomp 210 heads have Valvesprings for Hydraulic Flat Tappets heads ? Most heads this size are used with solid cams or radical HR cams.

2) F*k yeh on the intake ! Performer RPM is even much cheaper than the Air Gap....if $$$$ is to be saved.

Tune, tune, tune. So many people are up there own azz when it comes to tuning (engine + boat) that many boats are slugs because of this.

99% of performance enthusiasts (all motorsports) are bolt on and go. And then obviously disappointed.

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So.....hopefully the OP swaps intakes and then tunes correctly.

Pointing out another obvious - the look of that style boat puts up a big red flag that it will be hard to get decent mph out of it.

Speaking of which, it's an 85. Anything that old should also put up a red flag about possible water issues !

tommymonza

SB missed his original post of what boat it was in but now seeing this even if it doesn't have water I am quite sure that model is rather heavy and inefficient in bottom design,

If he does get the motor to it's full potential I think pushing that boat hard will take that old Alpha 1 right out .