Camshaft for 350
#22
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The camshaft you chose is less powerfull/smaller than the stock marine camshaft.
You will need at least 218/224 degrees of duration @.050 lift to get close to 350 horsepower.
The camshaft used in the 350/350 horsepower 1969 Corvette engine had 224/224 degrees of duration @ .050 lift.
For best performance install a camshaft with 110 degrees of LSA (lobe sep angle).
Dennis Moore
You will need at least 218/224 degrees of duration @.050 lift to get close to 350 horsepower.
The camshaft used in the 350/350 horsepower 1969 Corvette engine had 224/224 degrees of duration @ .050 lift.
For best performance install a camshaft with 110 degrees of LSA (lobe sep angle).
Dennis Moore
Dennis Moore
#23
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what do you think of some of the newer Marine cams I listed from Comp??
#24
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I think they are fine but they are also flat lifter cams. If you have a roller cam engine I strongly suggest you install a roller camshaft/lifters for better durability.
Maximum camshaft for a 350 would be 224/230 intake/exhaust duration @ .050 with a 110 LSA but you will need to twist the engine to 5200-5500 RPM for maximum performance. You might get 350 horsepower with this camshaft...
Dennis Moore
Maximum camshaft for a 350 would be 224/230 intake/exhaust duration @ .050 with a 110 LSA but you will need to twist the engine to 5200-5500 RPM for maximum performance. You might get 350 horsepower with this camshaft...
Dennis Moore
#25
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LSA 110 or 112
I think they are fine but they are also flat lifter cams. If you have a roller cam engine I strongly suggest you install a roller camshaft/lifters for better durability.
Maximum camshaft for a 350 would be 224/230 intake/exhaust duration @ .050 with a 110 LSA but you will need to twist the engine to 5200-5500 RPM for maximum performance. You might get 350 horsepower with this camshaft...
Dennis Moore
Maximum camshaft for a 350 would be 224/230 intake/exhaust duration @ .050 with a 110 LSA but you will need to twist the engine to 5200-5500 RPM for maximum performance. You might get 350 horsepower with this camshaft...
Dennis Moore
I have always thought that 112 LSA was the safest to avoid reversion?
Unless you run long risers to dump the water as far back in the exhaust flow.
Just wondering
#26
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I think they are fine but they are also flat lifter cams. If you have a roller cam engine I strongly suggest you install a roller camshaft/lifters for better durability.
Maximum camshaft for a 350 would be 224/230 intake/exhaust duration @ .050 with a 110 LSA but you will need to twist the engine to 5200-5500 RPM for maximum performance. You might get 350 horsepower with this camshaft...
Dennis Moore
Maximum camshaft for a 350 would be 224/230 intake/exhaust duration @ .050 with a 110 LSA but you will need to twist the engine to 5200-5500 RPM for maximum performance. You might get 350 horsepower with this camshaft...
Dennis Moore
#27
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Sounds like him with his cam info and rpm ranges.
Very good books Dennis !
I may not agree with everything you say/recommend/etc cam wise / power wise / etc but your books are really well done. Very good resources for most everyone. Wholly crap are they worth alot now since publishing has ceased.
That said, for shelf cams, the Hot Cam and Comp XM270HR (I'd rather the XM) have been time proven for power, idle, mileage, etc,etc for everyday driving 5.7's with Vortec and other typical performance heads. They idle great and pull to 5000-5200rpm.
383's will need a little more cam, like the 224,230 that DM mentions. Or bigger of course if a 'more juiced' build. More power than the typicals, a wise call would be to RMBuilder.
I experimented a little a few years ago and installed the Comp XM EFI cam with 218,224" at .050" , .575 lift, 113LSA on bone stock '91 Merc 5.7L , and installed BrodixIK180 heads/w beehives, etc,etc. 52-55 (55 was best)stockmph, 65-68mph
(68.1 was best) after. Idle like stock, brutal acceleration out of hole, and very good top end. Both Engine Versions used Eddie Marine exhaust.
Experimentation was really just the 113LSA. Normally I'm like Dennis where I like the tighter LSA's on small blocks, but I've found with good heads we don't have to run our chances of poorer idle, reversion chances, etc, etc that a tighter LSA will give. I still would not go wider than 112LSA for pretty much anybuild. Of course if building 'all out' we throw all compromises out the window and give the motor everything it needs. Alpha's need not apply. LOL.
Anyhow, if anyone wants to hang (online) with a big group of smaller deep vee I/O boats with single small block engines from 50mph's to 80+mph's, send me a PM and I'll direct you to where they are. Never any BS (weird I know) and always willing to help (with actual experiences) when they are around.
Very good books Dennis !
I may not agree with everything you say/recommend/etc cam wise / power wise / etc but your books are really well done. Very good resources for most everyone. Wholly crap are they worth alot now since publishing has ceased.
That said, for shelf cams, the Hot Cam and Comp XM270HR (I'd rather the XM) have been time proven for power, idle, mileage, etc,etc for everyday driving 5.7's with Vortec and other typical performance heads. They idle great and pull to 5000-5200rpm.
383's will need a little more cam, like the 224,230 that DM mentions. Or bigger of course if a 'more juiced' build. More power than the typicals, a wise call would be to RMBuilder.
I experimented a little a few years ago and installed the Comp XM EFI cam with 218,224" at .050" , .575 lift, 113LSA on bone stock '91 Merc 5.7L , and installed BrodixIK180 heads/w beehives, etc,etc. 52-55 (55 was best)stockmph, 65-68mph
(68.1 was best) after. Idle like stock, brutal acceleration out of hole, and very good top end. Both Engine Versions used Eddie Marine exhaust.
Experimentation was really just the 113LSA. Normally I'm like Dennis where I like the tighter LSA's on small blocks, but I've found with good heads we don't have to run our chances of poorer idle, reversion chances, etc, etc that a tighter LSA will give. I still would not go wider than 112LSA for pretty much anybuild. Of course if building 'all out' we throw all compromises out the window and give the motor everything it needs. Alpha's need not apply. LOL.
Anyhow, if anyone wants to hang (online) with a big group of smaller deep vee I/O boats with single small block engines from 50mph's to 80+mph's, send me a PM and I'll direct you to where they are. Never any BS (weird I know) and always willing to help (with actual experiences) when they are around.
Last edited by SB; 08-24-2011 at 09:24 PM.
#29
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I am going to give rmbuilder a call to see what he recomends for a cam. I am going to stick with the roller setup because I am using the whole vortec block not just the heads. I will post his reply.
#30
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You already hang out there and you're pretty much on top.
"It's a small block nation" - Tdaddy
- CFM (SB here)