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498 engine build N/A carb and intake suggestions?

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Old 08-20-2010, 08:34 PM
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What kind of exhaust? (if you have wet headers) Be careful of reversion with too much cam. May want to get around .222 @.050. Depending on the rise and where your water is induced. I'm sure Buiz knows better than me, But I didn't see anyone ask about exhaust.
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Old 08-20-2010, 08:44 PM
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CMI sport tube lite headers
Mike ^^^
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Old 08-21-2010, 01:07 PM
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Can anyone provide a link to the Merlin intake you guys are talking about?
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Old 08-21-2010, 06:18 PM
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Edelbrock 7561? PETO likes the air-gap 2.0 stuff
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Old 08-21-2010, 06:25 PM
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Thanks guys. I guess I am basically looking for the same performance naturaly aspirated (carb) with a 498" that I had with a whipple and fuel injection. Checkmate 270 Convincor is the hull, it ran a best of 81 mph @ 472" stock magnum heads, mild cam and CMI Sport Tube Lites and 8psi.
Hatch clearance is not an issue, I want to make the thing last and perform. I feel like I am going backwards with a carb and big cam BUT I think it is the best route.
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Old 08-21-2010, 06:27 PM
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Quote:
Originally Posted by BUIZILLA View Post
Billy... 296 is a tad bumpy... tone the cam down to around what Mike says, 113-114 LS installed LC at 109-110 is a MUST... I know the boat he's talking about... solid runner, good dock manners... Merlin and Demon 850 combo is great if you have hatch clearance room.. I have a 850 Demon on my 22 Donzi and have tuned 3 others just like it, 2 are 540's.. carb is tits.. wheel it to 5400-5450

your pal Al..
Hey J Im concerned with running too short of a duration with my compression... however I may be ok keeping the blower cam I have with aluminum heads. This boat stuff is alot harder than race cars LOL and I'm dealin with a lot smaller window!
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Old 08-21-2010, 07:26 PM
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what chamber size on the heads you have now?
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Old 08-22-2010, 05:05 PM
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what chamber size on the heads you have now?
I have all new parts. 310 Dart aluminum 121cc chambers
4.070 bore 10.2 compression
4.250 stroke.

I have not bought a cam or intake/carb yet
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Old 08-22-2010, 06:10 PM
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have you thought about the crane 741 it works good on the 496 combo with good heads and intake , i have done many of these and that cam with a good single plane intake and at least a 950 and you are at 600+ hp . we did a pair using that cam and the edelbrock victor intake with a 1050 and made 640 hp at 5600rpm , they are in a 32 active thunder that runs 92 on the gps so we know the power is there.
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Old 08-22-2010, 07:58 PM
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4.070 bore 4.250 stroke.
that works out to a 448 not a 498...
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