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Old 08-01-2011, 11:27 AM
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cam selection help request, v-drive boat

All,

I'm working on a V-drive boat project and need help picking a cam. I need to build lots of torque. It's a 17'6" flat bottom, 350 with a powerglide. I bought the boat with a rod through the side of the motor. I want to reuse most of the parts from the broke motor in my build. Here is what I have planned so far:

350 .040 over
Stock stroke and rod length
flat tops, double eyebrow
between 10 and 10.5 to 1 depending on what head gasket I end up using.
1.5 aluminum roller rockers (I think, I still have to check them)
Edelbrock RPM heads 185 intake runners, 69cc chambers, 2.02's
Edelbrock RPM air gap intake
750 holley, mechanical secondaries
Rewarder dry headers

I called 5 different cam guys last week to get their recommendations. I was surprised at how some of them asked for very little information. They seemed to be all over the map a bit too. They recommended intake lift anywhere from .444 up to .547. I'm no cam expert, so I am a little hesitant to pick something because I don't want to make the the wrong choice.

I appreciate any input you guys have.

Thanks,
Aaron

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Old 08-01-2011, 12:23 PM
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I believe anyone not asking for prop specs or gear reduction numbers isn't doing you any favors. I can't offer spec advice, but these play a big part in your quest - what RPMs this will be running, etc.
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Old 08-01-2011, 12:52 PM
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I had the same thoughts. My guess is that for the average Joe Homeowner they figure that you aren't racing so they have a select group of cams they like to sell. Once they figure out about where you want to be at they drop you into one of their standard bins and don't necessarily match to the components you are trying to work with. Kinda like small, medium, large, etc.

As far as RPM's, thanks for the reminder. I forgot to include that. I don't plan on turning it any faster than 6K.
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Old 08-01-2011, 01:21 PM
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6K rpm ? That v-drive, or any v-drive for that matter, has to be in perfect alignment.

And you are using a powerglide ? Is that the automotive powerglide ?

Have you talked to Oregon Cam Grinders ?
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Old 08-01-2011, 04:30 PM
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This powerglide has a torque converter eliminator kit. So, basically it's like having a full lockup converter all of the time. It's got a double cardan joint that connects it to the Casale box. Other than that, it's you average run of the mill short shaft.

I looked around Iskys site and I have to say it seems to be about the worst in terms of trying to find anything. I did call them and they spec'ed a lot more lift than anyone else. They were at .547/.555 (intake/exhaust). Closest anyone else came was .512. The guy gave me grind numbers S480 and S387. He also asked me the least about my build. He wanted to know engine, carb CFM, max rpm, and hp. I asked if he wanted head and intake specs and he said he didn't need it.

I want to make sure I get enough cam for my parts, but obviously I don't want to over cam it.

Thanks,
Aaron
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