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Biggest cam with CMI E tops

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Old 08-10-2013, 05:02 PM
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Default Biggest cam with CMI E tops

what's the biggest cam I can run with the factory 500efi CMI's without having reversion problems

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Old 08-10-2013, 10:07 PM
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Biggest isnt the best, there is a science behind cam selection. Best start by telling us about your entire set up, boat, engine build sheet etc.....
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Old 08-10-2013, 10:13 PM
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im looking at a going a different route with the engine since i lost a cylinder in mine. I want to still be able to run my headers and my switchable exhaust. looking going back to a carb motor but the motor im looking at is running a large solid lifter cam instead of hyd. and needs to run dry exhaust so I want to change the cam out so i can run my exhaust
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Old 08-11-2013, 10:42 AM
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If your still considering the engine I'm thinking about. Valako has a nice Hydraulic Roller Comp grind that would work good with that engine and heads. Lift and duration.
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Old 08-11-2013, 12:17 PM
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Yes I am Jason. I'll call Jim this week and talk to him. I just want to be able to use my E-tops and switchable exhaust and not have any reversion
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Old 08-11-2013, 08:51 PM
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Jim runs a real mild cam on his 780HP 565. 230/236.
He can spec a cam. With those heads the lift is important.
I think the same cam he uses would be great in that engine.
I would run those solid Isky's on his hyd roller like I do. Lash them to 0.006"-0.007" and hold on.
They were sent out to Isky and rebuilt .
He can also order the cam for you.

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Old 08-12-2013, 01:11 AM
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Cam choice will depend on many other factors. It depends on the cubic inches of the engine and head flow.
A cam that causes reversion in a 454 won't necessarily revert water in a 502.
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Old 08-12-2013, 03:28 AM
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there is a science behind cam selection.
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