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#84608 10/23/2007 3:00 AM | Joined: Jun 2007 Posts: 95 'Bolter | | 'Bolter Joined: Jun 2007 Posts: 95 | Opinions on the subject are as varied as anything; nevertheless, I am considering blocking off my butterfly heat riser valve as it is very worn and flops around. The exhaust is leaking out and blackening everthing around it. Obviously, there ar those who will say that the mechanism was put there by GM for a reason. Others will say it isn't necessary - especially for warmer climates. I can cut a beer can block gasket in about 3 minutes and seal this thing tight. Any input is appreciated.
J.D. Jordan
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#84609 10/23/2007 3:05 AM | Joined: Mar 2002 Posts: 9,115 'Bolter | | 'Bolter Joined: Mar 2002 Posts: 9,115 | You might be alright with it removed and you might not. Generally you don't need a cold climate to have carb icing problems, just the right combination of humidity etc. There may be a way of getting a bushing installed on your manifold. | | |
#84610 10/23/2007 3:14 AM | Joined: Nov 2001 Posts: 1,517 'Bolter | | 'Bolter Joined: Nov 2001 Posts: 1,517 | Or you can do what i did on mine,,remove the shaft and butterfly completely,,and put 5/16 bolts in the holes.
Marty | | |
#84611 10/23/2007 5:13 AM | Joined: May 2004 Posts: 920 'Bolter | | 'Bolter Joined: May 2004 Posts: 920 | I ran mine with it stuck in the shut position for some time. When I added the fenton headers, I installed a water heat set-up. No more cold blooded hesitations when I try to accelerate. Better gas mileage also, and then even better when I added the O.D., radials and HEI. Every professional engine builder I've talked too sez the intake heat is essential. Even in the warm climates. | | |
#84612 10/23/2007 3:43 PM | Joined: Jan 2000 Posts: 2,074 'Bolter | | 'Bolter Joined: Jan 2000 Posts: 2,074 | My welder guy who's been spliting 235 manifolds for years says to weld the riser in the closed position.
99 percent of the time it's closed as you are running and warmed up, closed position just protects the underside of the intake. | | |
#84613 10/23/2007 9:38 PM | Joined: Jun 2004 Posts: 8,597 Riding in the Passing Lane | | Riding in the Passing Lane Joined: Jun 2004 Posts: 8,597 | You can probable get along without it but blocking it off is not a good way. You still get some heat to the intake with the passage open. Remove the shaft & fill the holes is better.
They say money can't buy happiness. It can buy old Chevy trucks though. Same thing. 1972 Chevy c10 Cheyenne SuperIn the Gallery Forum | | |
#84614 10/25/2007 2:11 AM | Joined: May 2007 Posts: 36 Wrench Fetcher | | Wrench Fetcher Joined: May 2007 Posts: 36 | I remove it and welded up the holes and ran even better the when it was in there.More flow for the ehxaust. | | |
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