allen.alvin
Forum Newbie
Posts: 9
Reg: 06-15-12
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06-19-12 07:39 PM - Post#2239291
I have a Holley7456 on my 72 chevy pu w/350sb. On sharp acceleration we have a stumble but ease up to about 1,000 rpm's and then hit it and all is well. Any suggestion's.
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 JimKshortstep4x4
Chevytalk Moderator & "9th Year" Silver Supporting Member
Posts: 4193
Loc: Muskegon, MI, USA
Reg: 03-28-02
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06-20-12 04:41 PM - Post#2239583
In response to allen.alvin
Welcome to Chevy Talk from West Michigan!
I would suggest that you first make sure the timing, vacuum advance, and mechanical advance is working as they should. I like 10-12 BTDC initial setting with 34-36 degrees total advance in by 2800 rpm. Also, hook the vacuum advance to the manifold vacuum side so that the vacuum is activated at idle speeds.
On the carburetor make sure the accelerator pump linkage is adjusted and that the squirters produce a good spray with the engine turned off so that you can see what happens when the pedal is activated.
Good luck!
Jim
PS: Pictures of your truck would be nice.
Member 65-66 Full Size Chevrolet Club
65 Impala SS, 400sbc, Muncie M-22
66 Impala SS, 396, TH 400
69 El Camino, 350, TH 350
71 Short bed stepside 4x4, 350/350
71 Snow plow, 4x4, 350, TH 350
Current project, 72 GMC Shortbed, stepside, 427 |
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allen.alvin
Forum Newbie
Posts: 9
Reg: 06-15-12
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06-21-12 08:02 PM - Post#2239998
In response to JimKshortstep4x4
Thanks so very much for your input, I will follow up on these recomendation's and keep you informed on my progress.
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allen.alvin
Forum Newbie
Posts: 9
Reg: 06-15-12
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06-26-12 07:54 AM - Post#2241476
In response to JimKshortstep4x4
I checked out your suggestion's and found that the squirter's are not spraying as they should.Could this be linkage or dirty? I thought I had cleaned the carb thouroghly but must not have.
Thanks,allen.alvin
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JimKshortstep4x4
Chevytalk Moderator & "9th Year" Silver Supporting Member
Posts: 4193
Loc: Muskegon, MI, USA
Reg: 03-28-02
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06-26-12 05:53 PM - Post#2241663
In response to allen.alvin
I would check the adjustment of the linkage first.
Jim
Member 65-66 Full Size Chevrolet Club
65 Impala SS, 400sbc, Muncie M-22
66 Impala SS, 396, TH 400
69 El Camino, 350, TH 350
71 Short bed stepside 4x4, 350/350
71 Snow plow, 4x4, 350, TH 350
Current project, 72 GMC Shortbed, stepside, 427 |
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