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#68551 11/13/2006 11:25 PM | Joined: Jan 2001 Posts: 687 Shop Shark | | Shop Shark Joined: Jan 2001 Posts: 687 | Guys,
I know that up to a certain point of cam lift and duration you can run the stock exhaust manifold on the Chevy 6 (or any engine). But approximately when do you run into problems with cam/lobe overlap?
I have a very mild cam in my 292 (194I/204E duration at .050 and approx .464 valve lift on intake, .490 on exhaust). I currently have tube headers (won't make that mistake again) but recently ran into a great deal on an NOS 292 factory exhaust manifold. This will work great as the Offy 4 barrel intake was cast to work with the stock exhaust.
Should I be okay here, or go with Stovebolt's split cast iron exhaust?
-ftyler | | |
#68552 11/17/2006 9:55 AM | Joined: Apr 2005 Posts: 2,832 'Bolter | | 'Bolter Joined: Apr 2005 Posts: 2,832 | This is hard to answer with a definite quote. When you order a new cam from a good grinder they will want to know about vehichle weight, gearing, induction, desired rpm range, along with engine size. One thing for sure, it does no good to try to put into an engine with cam and carb, what you don't have enough exhaust system to get out.
Evan
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#68553 11/17/2006 4:04 PM | Joined: Nov 2002 Posts: 1,002 Shop Shark | | Shop Shark Joined: Nov 2002 Posts: 1,002 | There are two stock exhaust manifolds that I've seen on the 292. One has two studs, the other 3 studs, the difference is 2" and 2.5". Which one did you score?
Larry
I don't own a vehicle that isn't old enough to drink.
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#68554 11/17/2006 8:13 PM | Joined: Dec 2005 Posts: 324 Member | | Member Joined: Dec 2005 Posts: 324 | but the split manifold sounds so much nicer!
"It ain't a truck if you can't hose out the cab."
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#68555 11/18/2006 3:34 AM | Joined: Jan 2001 Posts: 687 Shop Shark | | Shop Shark Joined: Jan 2001 Posts: 687 | Larry,
I have the true 292 manifold that's generally used in larger trucks - it has the 2 1/2 inch rear dump. Plus the individual exhaust passages are larger.
Chester,
Not necessarily so. It depends on what type sound you're looking for. I personally don't like the "split six" sound - at all. I prefer the deep low, "near v8" sound. I believe that using the single manifold, along with keeping my single in/dual out Flowmaster, will preserve my current "near v8" sound that I have gotten with the long tube headers.
-ftyler | | |
#68556 11/18/2006 3:11 PM | Joined: Dec 2005 Posts: 324 Member | | Member Joined: Dec 2005 Posts: 324 | true enough. i have always liked the sound of a mild cam.
"It ain't a truck if you can't hose out the cab."
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#68557 11/18/2006 11:00 PM | Joined: Jun 2004 Posts: 8,597 Riding in the Passing Lane | | Riding in the Passing Lane Joined: Jun 2004 Posts: 8,597 | The stock 292 manifold with 2" outlet is very restrictive. The exhaust will run very hot & burn out gaskets & warp manifolds when used hard. The 2 1/2" would work better but are pretty rare.
They say money can't buy happiness. It can buy old Chevy trucks though. Same thing. 1972 Chevy c10 Cheyenne SuperIn the Gallery Forum | | |
#68558 11/19/2006 2:44 AM | Joined: Jan 2001 Posts: 687 Shop Shark | | Shop Shark Joined: Jan 2001 Posts: 687 | Wrenchbender,
Yep, you're right. That's why I got the 2 1/2 incher. If I work up the nerve to try a homemade lump ported intake and mild (4-71) blower on my next 292 build then the manifold may have to go.
-ftyler | | |
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