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  #1 (permalink)  
Old 12-09-2009, 03:16 PM
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holley carb not right

I need some help with the 600 holly vc carb on my maverick. It is the model 80457. I have a stock 86 roller 302 in it with a performer rpm intake and headers. When I got it together it ran like crap. My uncle adjusted it for me and it ran fine a couple of days then it started to sputter real bad when you get on it. A friend of mine who uilds them took it apart and cleaned it. It had a little rust in it. He also det th fuel and air the way holley says to. It ran great again for about a couple weeks. Today it started to sputter real bad again when I got on it hard. When I got home I took the tank off figuring it was nasty but it wasn't. I put it back on and then I checked the carb. It was also clean inside. I am kinda stumped so if anyone could help it would be appreciated.
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Old 12-09-2009, 06:51 PM
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Sounds like a problem in the power circut like the power valve. How new is the carb, and has it been rebuilt?
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Old 12-10-2009, 06:38 AM
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Quote:
When I got home I took the tank off figuring it was nasty but it wasn't. I put it back on and then I checked the carb. It was also clean inside.
Ayuh,... Have you changed the Fuel Filter since the problem surfaced,..??
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Old 12-10-2009, 06:58 AM
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I do have to say that I had a 0-1850 Holly that did exactly yhe same thing. I finally gave up after at least three rebuilds and various part change outs - virtually everything but the original castings. My solution - replace it!! Yes, I know that's expensive, but I chased the problem for over a year. Runs good today, then the next day - garbage. In my case, I even had a brand new fuel system - tank, lines, pump, filter. I tried a 3310-3, way too big, but never a problem. My final replacement, an Edelbrock 600CFM - and that one ran like a top for several years with one instance of dirty fuel that only required a quick flush then back to 'as before'. That particular one ended up on my F350/460 after the OEM Holley went to carb heaven after 200K miles.

Dave W
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Old 12-10-2009, 02:34 PM
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There may be junk stuck inside the float valve. You could have too much fuel pressure. The pressure should be around 5-6 psi.
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Old 12-10-2009, 07:57 PM
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Its a stock manual pump. I have another carb that same model on a truck that is about to sell so I might swap them. It seems funny to me that it will work fine for a couple days them start running like crap. It done this on the maverick and my dads tr7
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Old 12-10-2009, 11:05 PM
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Edelbrocks may "look funny" on a FoMoCo...but they are pretty much trouble free. I like'em!
6sally6
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Old 12-11-2009, 07:11 AM
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Quote:
Originally Posted by 6sally6
Edelbrocks may "look funny" on a FoMoCo...but they are pretty much trouble free. I like'em!
6sally6
Moderators note:
It never fails, someone posts a message about a problem with a Holley and someone else slams Holley. Your response was rather mild compared to others that have been placed, but if you don't have anything constructive to add.....why respond at all? We do not want this forum to degenerate into a newsgroup mentality.

Vince
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Old 12-11-2009, 07:42 AM
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I asked two questions and got no reply. The only constructive thing I can add is try using spell check....
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Old 12-11-2009, 08:24 AM
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Quote:
Originally Posted by old fords
It done this on the maverick and my dads tr7
OT, but a Holley 4-bbl. on a TR7??!!

Unless his Bullet got a different bullet, I can't see it.
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Old 12-11-2009, 09:24 PM
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Quote:
Originally Posted by 302 Z28
Moderators note:
It never fails, someone posts a message about a problem with a Holley and someone else slams Holley. Your response was rather mild compared to others that have been placed, but if you don't have anything constructive to add.....why respond at all? We do not want this forum to degenerate into a newsgroup mentality.

Vince
My bad Guess ,in my own silly way I was suggesting to try another carb, since this is the second carb(holley) that gave the same kind of trouble. Nothing wrong with Holleys, I've had several. Just say'in, try another carb that MAY not have the same inherant problem as the ones previously. Your rebuke was well deserved on my part and I apologize.
6sally6
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Old 12-12-2009, 05:12 PM
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I had a problem similar in my Chevelle. Turn out to be the spark plugs. It ran fine for a while then it started to missfire. It glazed because I using the wrong heat range. Maybe you may have to try a drifferent set of plugs.
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Old 12-12-2009, 05:48 PM
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Quote:
Originally Posted by cobalt327
OT, but a Holley 4-bbl. on a TR7??!!

Unless his Bullet got a different bullet, I can't see it.
tr7 was a 351w
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