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Sticky?? Cam overlap degrees for marine cam selection

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Old 07-19-2021 | 07:39 PM
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sorry cheech for not reposnding sooner - nope havent degreed anything yet - im swamped with engines to rebuild. Its still on the lathe where I was attempting to polish out the rusty sections (unsuccessfully) -
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Old 07-19-2021 | 10:17 PM
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I watched an episode of Redline Rebuild on Hagerty YouTube channel. Guy sent an old Cadillac cam to this place in link to get reground.
Never heard of them until then.
Have no idea if it's an effective solution in your situation or not, cost wise or else, mainly longevity. If you are determined to run the OEM specs.
And what's the audience reading this take on reground cams anyways?
Delta Camshaft - We manufacture horsepower!
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Old 07-19-2021 | 10:33 PM
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yes regrounds not really an option - if the merc cam goes for $650, and a GM Ramjet cam goes for $230- and both deliver the goods, id be inclined to say its quite obvious where my thinking is headed - there are alot of cams that can work as marine cams - im trying to get some kind of science behind it - too much talk of LSA and nothing about actual overlap in degrees (for starters) and as SB pointed out, other valve timing events-

fwiw - if anyone is possibly interested in collaborating - I can code almost anything - would be nice to have a wet exhaust marine cam selection tool for the general folks that feel upward of 600 for a 350 roller cam is on the spendy side- esp for a cruiser.

Last edited by CamaroMan; 07-19-2021 at 10:35 PM.
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Old 07-19-2021 | 10:59 PM
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Not sure if coding really needed. Here are basics from real world and we can get deeper into it later.

For sbc:
comp extreme marine 212/218 at .050” 112 lsa installed 108icl/116 ecl pretty much max with stock mercruiser manifolds. Good power though, especially with vortec or good aftmkt heads.

conp extreme marine 218/224 at .050” 112lsa installed 108icl/116 ecl good with eddie marine long risers /glm or merc with 10” to 12” inner extensions welded in. Comp extreme marine 224/230 at .050” 112lsa teally needs 10:1 compression 350 or very kight fast boat with 9:1, but more 383’s use this cam. Same exhaust rules apply. Stock merc even with mods not good here at all.
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Old 07-20-2021 | 10:04 AM
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ok - so for a 9 to 1 standard 383 the ramjet is fine yes? im not looking for exotic power levels.. im trying to make this as reliable and long term as possible.. its a big heavy boat- is my question is if i punch in those numbers, will the overlap degrees give any sort of indication? appreciate the info!
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Old 08-31-2022 | 06:43 AM
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Originally Posted by SB
Not sure if coding really needed. Here are basics from real world and we can get deeper into it later.

For sbc:
comp extreme marine 212/218 at .050” 112 lsa installed 108icl/116 ecl pretty much max with stock mercruiser manifolds. Good power though, especially with vortec or good aftmkt heads.

conp extreme marine 218/224 at .050” 112lsa installed 108icl/116 ecl good with eddie marine long risers /glm or merc with 10” to 12” inner extensions welded in. Comp extreme marine 224/230 at .050” 112lsa teally needs 10:1 compression 350 or very kight fast boat with 9:1, but more 383’s use this cam. Same exhaust rules apply. Stock merc even with mods not good here at all.
I'm looking at getting a crower cam similar to the cam in the 377 scorpion for my current mpi build. I currently have IMCO powerflow exhaust with 12 inch risers. Would I be looking at reversion issues?


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Old 09-01-2022 | 02:15 PM
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Originally Posted by Franks292
I'm looking at getting a crower cam similar to the cam in the 377 scorpion for my current mpi build. I currently have IMCO powerflow exhaust with 12 inch risers. Would I be looking at reversion issues?


I run this exact cam on a 377 stroker (standard bore ) with GLM exhaust, stock Merc elbows and 4" through hull. I have a wide band sensor running full time and have been doing so for the last 11-12 years. Reversion is not an issue with my setup.

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Old 09-01-2022 | 04:39 PM
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Originally Posted by Trash
I run this exact cam on a 377 stroker (standard bore ) with GLM exhaust, stock Merc elbows and 4" through hull. I have a wide band sensor running full time and have been doing so for the last 11-12 years. Reversion is not an issue with my setup.
Good to hear! Man i Would love to hear what it sounds like! How do you like the power? Are you injected or carb?
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Old 09-01-2022 | 05:00 PM
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Will sound mild, with that duration and 114lsa. Pretty much just Like a 365hp 454.
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Old 09-01-2022 | 07:08 PM
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Originally Posted by SB
Will sound mild, with that duration and 114lsa. Pretty much just Like a 365hp 454.
would more duration than this be safe with a 114 LSA and wet exhaust?
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