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  #16 (permalink)  
Old 11-30-2012, 02:32 PM
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yes you can use e street heads and 600 carb.If you dont own them then I dont see why you would buy them? The 3.8 stroke might be a good idea.

another option to bring the rpm down lower and increase the torque sooner
4.03 bore X 3.875 stroke= 396,with same parts I mentioned before or sub street master intake, small roller hydraulic and 500 pounds torque should happen. In a ski boat I would think pulling 6 one ski skiers as easy.

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Old 11-30-2012, 07:15 PM
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[QUOTE=gerry rautenbach;1617522]like i said the boat is not for racing but should be able to pull skiers easily and have some fun it look"s like the cam is very important any part numbers that i should look at? exhaust's are wet as i understand (big bulky and don't look like they are in very good condition QUOTE]

Jerry,Get yourself a marine performance cam.You should stay under 280 degrees duration. When you call the tech line for help make sure and ask them about water reversion, if the guy says "What?" hang up and move on!! Then contact Jones Cam Design in North Carolina
If you are to take full advantage of all that horsepower you are going to have to step on the exhaust. Glenwood makes an excellent exhaust log and elbows that will not be that of a header but much better than cast iron manifolds. A little pricey but worth the investment and will give you years of service, plus they look great! Glenwood located in California USA
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Old 12-01-2012, 02:20 AM
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water reversion

could you explain what water reversion is (never heard of it before)
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Old 12-01-2012, 05:21 AM
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If you get too much cam overlap and duration, water will get sucked into the exhaust on the intake stroke. You might also find the motor would start dry but when it is in the water, would not start because the exhaust pipe is filled with water. A good cam grinder understands this if he has done work on marine engines before. Usually under 280 degrees duration. I called one of the big cam manufacturers one time and had to explain this to the guy on the tech line. Thats when some one on this site turned me on to Jones Cam Design who has ground cams for marine engines before. I gave him my specs and he had 2 choices for my engine. I put in a solid lifter cam that pulls well from 3500 right up through 7200 rpm.
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Old 12-01-2012, 05:47 AM
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more on 383 stroker

gee thanks a lot sorry that i sounded a bit stupid but as i said boat motors is new to me so i think i will go for a hydraulic roller e street heads performer int that should be a good combo from idle to lets say max of 4500-5000 rpm do you think i am on the right track?
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Old 12-01-2012, 12:34 PM
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Quote:
Originally Posted by gerry rautenbach View Post
gee thanks a lot sorry that i sounded a bit stupid but as i said boat motors is new to me so i think i will go for a hydraulic roller e street heads performer int that should be a good combo from idle to lets say max of 4500-5000 rpm do you think i am on the right track?
Nobody stupid here, everyone has questions. Yes you are on the right track. You see now why a marine cam is different? What did you decide about the exhaust?
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Old 12-02-2012, 02:58 AM
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exhaust

now you are really going to think i'm stupid what should i use the old exh looks like it is ready for scrap metal ( by the way i sent a mail to jones cams waiting for reply) should i use something similar -aftermarket ? any part numbers i can look at ?
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Old 12-02-2012, 04:38 AM
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Originally Posted by gerry rautenbach View Post
now you are really going to think i'm stupid what should i use the old exh looks like it is ready for scrap metal ( by the way i sent a mail to jones cams waiting for reply) should i use something similar -aftermarket ? any part numbers i can look at ?
Here is the link to Glenwood. Maybe you might find a dealer near you that could help
Glenwood Marine Equipment

I might have decent picture somewhere, you might have to wait until Monday
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