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03-15-2016, 08:27 PM
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#1 |
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Registered User
 
Join Date: Jun 2015
Location: weirton WV
Posts: 76
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exhaust cutout valve?
i am putting new headers and exhaust on my 72 C20. 402 big block. i am installing after market headers and with dual exhaust
first question: what are the pros and cons of using a exhaust cutout valve? second if i do get a new one should i go factory or remote ? here is a pick of the old one |
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03-15-2016, 09:47 PM
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#2 |
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Registered User
Join Date: Sep 2013
Location: Gonzales, La
Posts: 1,441
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Re: exhaust cutout valve?
I would go remote as they limit the amount of torque put on the cutout when closing. I have ruined a few of them just holding the switch just a lil too long on closing.
__________________
MyToys: Goldilocks the "Ol School Survivor" 1968 C10, SWB Stepside, 08/15 TOTM, 250 CI 6 cylinder, 3 on the tree, 3.73 rear, 3/5 static drop, 23,500 original miles. Samson the 1970 CST10, LWB, 462Ci, Turbo 350 tranny, 3.08 rear gear, PB, PS, A/C, AM/FM, 2/4 Drop. Brutus the 1998 Camaro Z28, 33,500 original miles, LS1, 519 RWHP/497 RWTQ. Member of the Louisiana Classic Truck Club, LCTC Member of the Louisiana C10 Club Member of the Baton Rouge Drifters Car Club |
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03-16-2016, 12:47 AM
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#3 |
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Registered User
Join Date: Apr 2015
Location: Pacific Palisades CA
Posts: 98
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Re: exhaust cutout valve?
Friend ran a qtp cutout for around 2 years. Never had any issues with using a switch. I bought some cheap ones off ebay and we'll see how well it works.
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03-16-2016, 12:48 AM
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#4 |
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Registered User
Join Date: Aug 2012
Location: Midland, TX
Posts: 1,267
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Re: exhaust cutout valve?
What you are showing is a heat riser valve. When the exhaust heats up the spring expands and opens the valve. This is not an exhaust cutout.
Here's a new one on eBay. http://www.ebay.com/itm/Chevelle-Cam...tWJnCL&vxp=mtr 
__________________
1969 RS/SS Z10 Camaro Pace coupe 1972 GMC Short Step buildhttp://67-72chevytrucks.com/vboard/s...=1#post6356218 1979 Mazda RX7 1979 Pontiac Trans Am WS6 & 1979 Pontiac Trans Am 10th Anniversary 1999 Honda Valkyrie 2006 Corvette Z06 2010 BMW 650i |
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03-16-2016, 09:12 AM
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#5 |
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Registered User
Join Date: Jun 2015
Location: weirton WV
Posts: 76
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Re: exhaust cutout valve?
thanks Z10.
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03-16-2016, 12:21 PM
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#6 |
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Senior Member
Join Date: Mar 2003
Location: Colfax-California
Posts: 8,389
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Re: exhaust cutout valve?
Heat riser is an emission thing. Flap closed while engine cold. Exhaust would then be partially diverted up through the exhaust crossover in the intake manifold, thus heating up the intake faster for better fuel atomization. Once the engine warmed up to operating temp the flap would open. Why you want this on a header is up for question
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03-16-2016, 07:29 PM
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#7 |
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Registered User
Join Date: Oct 2007
Location: Spanaway
Posts: 8,451
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Re: exhaust cutout valve?
Eliminate it..
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Mike. Swamp Rat build thread : http://67-72chevytrucks.com/vboard/s...d.php?t=595019 72 3/4T 4X4 4" BDS Lift 33" BFG's |
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03-16-2016, 08:54 PM
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#8 |
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Registered User
Join Date: Jun 2015
Location: weirton WV
Posts: 76
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Re: exhaust cutout valve?
eliminated. thanks swamp rat.
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03-17-2016, 01:21 AM
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#9 |
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Registered User
Join Date: Dec 2015
Location: Prescott Arizona
Posts: 621
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Re: exhaust cutout valve?
Follow up question, since my truck doesn't have the emissions junk, has the ram horn manifold, Holly carb, and I want to redo the exhaust, removing this should be okay?
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1968 Long Bed 2016 Honda Civic Coupe EX-T ticket magnet |
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03-17-2016, 06:50 AM
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#10 |
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Senior Member
Join Date: Dec 2013
Location: Gods country East,Tn
Posts: 8,545
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Re: exhaust cutout valve?
keep the rams horn manifolds and run new 2 1/4 inch exhaust back from them (assuming its a stockish small block )
__________________
 1967 Factory short bed - Old school '71 - 350 / 4bolt / 487 heads / Edelbrock C3BX Muncie M-22 4 speed / Hurst Comp plus Factory 12 bolt posi 3.73 / 255-70-15 Smoothed firewall / Factory cowl induction Power disc brakes / power steering / 3.5-5" drop |
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03-17-2016, 11:42 AM
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#11 |
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Registered User
Join Date: Jan 2013
Location: Eastern TN
Posts: 1,919
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Re: exhaust cutout valve?
He has a BB. I would follow his advice still unless those manifolds are horrible. I run headers only because that is what fits my heads (D ports). If you want some better flow look into Sanderson's as they are cast iron. This eliminates all the headaches of bad sealing, leaks, scratched coatings, or rusting out. My coated headers have a good amount of rust after 2 years and they are coated and had the proper break in procedure.
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