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#1 |
Registered User
![]() Join Date: Feb 2001
Location: East Central, MO
Posts: 11,336
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Holley Question?
Will a serious backfire blow the power valve out of a Holley? Have heard that Holley's are bad for this?
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#2 |
What are you looking at?
Join Date: Jul 2003
Location: Kellyville,Oklahoma
Posts: 308
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I am not sure if a backfire will blow the power valve out or not but, Holley are notorious for the power valvesgoing bad. I had to just change mine a month or so ago.
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1971 GMC LWB 2005 Honda Element 2007 Honda Fit ![]() |
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#3 |
PROJECT 7DEUCE
![]() Join Date: Dec 2002
Location: GRANTS PASS OR
Posts: 21,608
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Yes I have had it happen before!!!
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GO BIG GREEN ![]() MEMBER #6377 72 k-5 daily driver 6'' lift 35'' 350-350-205 slowly getting rust free. Project "7DEUCE" check out my build http://67-72chevytrucks.com/vboard/s...d.php?t=267665 Tim Powell..R.I.P EastSideLowlife..... R.I.P.. |
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#4 |
creator of kong
Join Date: Mar 2001
Location: Kentucky
Posts: 538
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Yes they sure will..............changed one out not too long ago..............
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#5 |
Registered User
Join Date: Nov 2002
Location: Eureka Springs AR
Posts: 494
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It doesn't take much of a backfire through the carb to blow a powervalve. You can buy a kit and some newer holly's have them fact. a checkvalve that prevents this.
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Buy Sale or Trade 71 3/4 4x4 72 1/2 ton cheyenne 4x4 |
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#6 |
Registered User
![]() Join Date: Feb 2001
Location: East Central, MO
Posts: 11,336
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This is a new street avenger but it hasn't ran right since this happened. Hot wire to the coil came off one night and i was doing like 75 mph. It runs decent but something just isn't right. It hesitates a little at times and falls on its face out on the highway after you let off it and then get back in it. I have one here so I think I'll go ahead and change it.
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#7 |
Registered User
![]() Join Date: Feb 2001
Location: East Central, MO
Posts: 11,336
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Hey thanks for the replys!
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#8 |
Giddy up giddy up...
Join Date: Feb 2001
Location: US
Posts: 483
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Sorry for the retard question
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72 with 69 grille and custom 73-87 stepside. BIG BLOCK 409, SM465, NP205, 3/4 axles slung under a 5" lift, 3"bodylift, 112" frame, and 35inch Pro Comp X-terrains... "BUILT NOT BOUGHT" Here's the site... |
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#9 |
Registered User
![]() Join Date: Feb 2001
Location: East Central, MO
Posts: 11,336
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Well someone correct me if I'm wrong but I would say using too much gas, the smell of raw gas after a short time with you foot in it and then letting off, hesitating, etc.
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#10 |
What are you looking at?
Join Date: Jul 2003
Location: Kellyville,Oklahoma
Posts: 308
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When my power valve went I was having issues with my engine flooding...it was almost like the choke was sticking.
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#11 |
Account Suspended
Join Date: Oct 2002
Location: Olathe, KS
Posts: 2,301
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Blown power valves will cause a huge drop in gas mileage, black smoke out the tail, rough running, hard starting and eventually fouled plugs. It's taking gas right from the float bowl and sucking it down the intake, UNMETERED!
If anyone needs a ANTI-Backfire kit ( Orfice and a drill bit ) made by Mr. Gasket just let me know. 10.00 shipped anywhere in the US. I have about 20 kits. It prevents a large volume of air to enter the power valve chamber quickly. It won't affect the performance at all. Most newer holley's come with it. Last edited by Piston; 07-16-2003 at 08:17 PM. |
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#12 |
Giddy up giddy up...
Join Date: Feb 2001
Location: US
Posts: 483
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Cool, thanks for the info guys
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72 with 69 grille and custom 73-87 stepside. BIG BLOCK 409, SM465, NP205, 3/4 axles slung under a 5" lift, 3"bodylift, 112" frame, and 35inch Pro Comp X-terrains... "BUILT NOT BOUGHT" Here's the site... |
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#13 |
Registered User
![]() Join Date: Feb 2001
Location: East Central, MO
Posts: 11,336
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Piston doesnt really sound like I have a blown power valve then. What could be casuing my hesitation fro a dead stop?
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