"Dry" exhaust and Cam Selection Question
10-19-2012 | 09:45 AM
#1
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From: Avon, OH
"Dry" exhaust and Cam Selection Question
I'm looking to build some big power small blocks and the cam always seams to be a limitation due to reversion issues and the related limitations on duration.
If I upgrade my exhaust to a 'dry' system with double water jacketed tailpipes, I assume the reversion issue is eliminated completely? Exhaust is a BIG investment.
I can get some headers with big tubes to let big heads breath using a big cam in this scenario?! I am shooting for 600hp so these little 427 cid small blocks are gonna need to breath.
The cam the builder usually uses to produce 610hp in this engine is as follows:
VALVE LIFT WITH 1.5 ROCKERS : INT .580 / EXT .600
DURATION IN DEGREES : ADVERTISED - INT .300 / EXT .506
DURATION @0.050" : INT .253/ EXT .258
LOBE SEPARATION ANGLE : 110º
Thanks for any advice.
Tom
If I upgrade my exhaust to a 'dry' system with double water jacketed tailpipes, I assume the reversion issue is eliminated completely? Exhaust is a BIG investment.
I can get some headers with big tubes to let big heads breath using a big cam in this scenario?! I am shooting for 600hp so these little 427 cid small blocks are gonna need to breath.
The cam the builder usually uses to produce 610hp in this engine is as follows:
VALVE LIFT WITH 1.5 ROCKERS : INT .580 / EXT .600
DURATION IN DEGREES : ADVERTISED - INT .300 / EXT .506
DURATION @0.050" : INT .253/ EXT .258
LOBE SEPARATION ANGLE : 110º
Thanks for any advice.
Tom
10-19-2012 | 12:55 PM
#4
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Joined: Dec 2003
Posts: 615
Likes: 1
From: Hudson River, NY
Well, that settles it then. Dry it is!
10-19-2012 | 05:29 PM
#8
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Joined: Dec 2010
Posts: 1,671
Likes: 29
I'm looking to build some big power small blocks and the cam always seams to be a limitation due to reversion issues and the related limitations on duration.
If I upgrade my exhaust to a 'dry' system with double water jacketed tailpipes, I assume the reversion issue is eliminated completely? Exhaust is a BIG investment.
I can get some headers with big tubes to let big heads breath using a big cam in this scenario?! I am shooting for 600hp so these little 427 cid small blocks are gonna need to breath.
The cam the builder usually uses to produce 610hp in this engine is as follows:
VALVE LIFT WITH 1.5 ROCKERS : INT .580 / EXT .600
DURATION IN DEGREES : ADVERTISED - INT .300 / EXT .506
DURATION @0.050" : INT .253/ EXT .258
LOBE SEPARATION ANGLE : 110º
Thanks for any advice.
Tom
If I upgrade my exhaust to a 'dry' system with double water jacketed tailpipes, I assume the reversion issue is eliminated completely? Exhaust is a BIG investment.
I can get some headers with big tubes to let big heads breath using a big cam in this scenario?! I am shooting for 600hp so these little 427 cid small blocks are gonna need to breath.
The cam the builder usually uses to produce 610hp in this engine is as follows:
VALVE LIFT WITH 1.5 ROCKERS : INT .580 / EXT .600
DURATION IN DEGREES : ADVERTISED - INT .300 / EXT .506
DURATION @0.050" : INT .253/ EXT .258
LOBE SEPARATION ANGLE : 110º
Thanks for any advice.
Tom
Are you going with an LS7 or what are you doing?
Last edited by Captain YARRR; 10-19-2012 at 05:53 PM.
10-19-2012 | 08:52 PM
#9
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Joined: Nov 2005
Posts: 312
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From: Avon, OH
Small block strokers
427 cube dart shp blocks, pro 1 alum heads, etc... Pretty economical way to put some solid HP numbers in this boat. Should be pushing 1200! I've had small block Chevy hot rods all my life so am doing what the boat is set up for and what I know best (just adding cubes).
10-20-2012 | 04:51 PM
#10
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Joined: Nov 2006
Posts: 1,313
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From: Tygart Lake, WV
If it were mine I would go Lightning Marine Dry Jacketed headers or Stainless Marine Dry Tails if your going manifolds.
Both should not have a problem with any size cam and should let them breathe when you need it.
Loud is Good!!!!
