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  #16 (permalink)  
Old 02-21-2013, 12:44 PM
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Here is the Ramjet intake for Vortec heads.

Merc marine intake for Vortec head use. Used on 305/350/383 marine engines, I run this in my 1997 Vortec 350 reg cab shortbox 2wd truck, runs much better than teh stock truck intake, and allows me to run any sized injector I wish(unlike teh stock truck intake)

Same marine intake next to Vortec truck intake manifold

Same intake in Mercruiser red

different angle

Here is the same marine intake with the upperplenum removed. You can see how the runner eopenings are across from the cylinder head intake port it feeeds. the cross ram runners are about 10" long from the opening inside teh plenum to the intake gasket flange.

Inside of Vortec 305/350 truck intake. Lots of injection debris impeding flow.

Scorpion 400 intake, it uses the same tunnel ram lower that is mentioned elsewhere in this thread.



Last edited by Hogg; 02-21-2013 at 12:50 PM.
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Old 02-21-2013, 04:15 PM
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Originally Posted by F-BIRD'88 View Post
If you wnt to go fast and have fun on the water find a good used Hydrostream.
Google it.
Been reading this Post. I agree with F-Bird on all, Except this, to each his own of course, GO fast, Get one of these, put 6 cyl in present boat, sell it put funds into safer boat than the above "chine walker" I know, I owned 2 before I wised up! Sorry had to say it
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  #18 (permalink)  
Old 02-22-2013, 08:40 AM
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Hey BadBehavior, That boat is sexy like a good women.
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Old 02-22-2013, 06:43 PM
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We still build that 5.7 engine w/ the same intake as the mercruiser in which is a Bosch injection set-up.
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Old 02-23-2013, 10:05 AM
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Originally Posted by F-BIRD'88 View Post
Originally Posted by crussell85
Is this a bad out drive?
I'm not real up on this Penta drives. I am of the opinion they are light duty.
This hi perf 383 motor build recipe I laid out is no wimp.

Hot rodding a boat is not the same as hot rodding a car.
It is never cheap.

A Mercruiser Alpha drive (V8 {1.5:1 ratio} in good condition is the minimum.
Mercruiser will tell you you need a Bravo Drive for this engine.

Any all V6 engine drives will not work.
The stock default thru the drive exhaust routing will not work.
Ayuh,.... I believe you'll find that the SX drives are cone-clutch drives, which are miles ahead of the Merc Alpha drives, more like the Bravos, but not quite as heavy duty...

It's a dependable drive up to 300 hp, 'n still dependable over that, if the operator has self-control over his righthand...
in other words, skip the WOT jackrabbit starts, 'n yank back on the throttle if by chance ya clear the water, 'n catch air on a wave...

'n,... The thru-prop ain't so much the problem, but the open plenum exhaust manifods are the choke point in the exhaust flows...
The vortex created by the prop, actually helps pull the gases out...

Originally Posted by F-BIRD'88 View Post
If the SX drive on your boat is not in excellent condition do not hot rod the engine.
A worn drive will not last behind a powerfull engine. A 4 cyl V6 drive or drive for a 305 is light duty and usually the wrong internal ratio.

If this is a light duty drive just enjoy your boat for what it is.
Or it will soon become a lawn/driveway ornament.
Only the Ratio changes, each drive is as strong as it's sisters....

'n, of course, a Worn out drive isn't dependable, regardless the amount of power applied...

There's No reason the OP shouldn't move forward with his Plan,...
383s are stuffed into boats, quite regularly...

If crussel would like a more Marine rated conversation 'bout this,...
Feel free to stop by iboats boatin' forums,...
There's many conversations there, 'bout this exact thing...
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