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Old 03-08-2012, 04:53 PM
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LT4 Cam Question

Will this cam work on my boat? http://www.summitracing.com/parts/NAL-24502586/

The engine is a block from a 93' K1500 with 062 Vortec Heads. I'm curious if it will fit the engine and how well it would do in a boat? I'm not really sure at what duration "Water Reversion" becomes a concern.

From everything that I have read this is the cam that is currently in the boat http://www.summitracing.com/parts/NAL-14097395/ I used the cam that was in the stock 305 in my 383 which is currently in the boat but it's just not up to snuff. I really want more performance.

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Old 03-08-2012, 05:26 PM
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Reversion becomes an issue with too much cam overlap (intake and exhaust valves open at the same time). Duration plays into overlap so generally speaking, the longer the duration of cam the higher the degree of overlap.

Now as far as how MUCH overlap will cause reversion, I cannot answer.
My experience is with my Olds 455 powered jet boat and the generic Comp Cams 'Jet Boat Cam' that everyone seems to use created issues for my particular application so I had my builder order up a custom cam with less duration/overlap but higher lift. Now my boat is way more powerful across the usable power band (idle to 5000 RPM), no reversion issues and I no longer have that obnoxious lumpy idle that the kids seem to love and caused my reversion issues.

Not sure what the specs are on that LT4 cam but from what I recall, it's not a crazy big cam so the overlap probably isn't obnoxious either.
Just my .02
Elm
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