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Old 04-05-2005, 07:02 AM
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Holley giving me fits

Good Morning, I have a Holley 650 dbl pump.(04777) with a proform main body
that I cant seem to get a stumble out of. I have tried a multitude of different pump nozzels and pump cams I even installed 50cc pumps . the jetting is 71 pri. 75 sec. its has a 7.5 power valve . The car is a 77 Monte with a 30 over 350 bowl blended 194/150 heads with around 9to 1 compression. Its got a comp cam with around 470 lift (I dont remember put it in a long time ago) but around that. 2,000 stall converter . The car ran very good until I put that main body on I am thinking just put the holley main body back on but I have that on there now and want to try to get it to work . I checked for vacuum leaks and there are none. The timing is set about 10 Deg. What do you guys think. Thanks (oh yeah its got a 1 inch four hole spacer too)

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Old 04-05-2005, 09:06 AM
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What is your total timing? Try to get around 35 degrees total with the initial at around 14. Also, try it without the spacer. I had a friend who is a very good carb tuner chase his tail for quite a while with a Proform center on a Holley 750. He ended up putting the Holley main body back on, it just worked better.

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Old 04-05-2005, 10:49 AM
Technical Support Barry Grant
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If the center section is the only thing you changed before the problem started I'd swap them back to make sure you're not chasing something else that may have happened.
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Old 04-06-2005, 04:06 PM
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Hey guys, thanks. I think I am just gonna put the holley body back on.
The car runs pretty good but just not really good . Thanks for the replys.
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