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Joined: Jan 2006
Posts: 3
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Joined: Jan 2006
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Son and I are having problems, hope you can help.... 1961 (Impala) Chevy 235 just rebuilt, added Clifford headers & water manifold, 4v Holley 390cfm (rebuilt by Larrowe and Sons), adjusted octone selector to 0, carb vaccum plugged, timing set to ~5deg BTDC....Idles great but studders when accelerating.
Dwell set ~22?
Headers running bare...have not had exhaust system completed yet.
What should we check? Appreciate any help.
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Joined: Dec 2000
Posts: 3,332
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Joined: Dec 2000
Posts: 3,332 |
Set the points at .018" & never mind the dwell meter. Then reset the timing. The vacuum advance needs to function, as well. Re check valve adjustment. Good luck. PS: Don't run it to long with headers open that way.
John M., I.I. #3370
"There are no shortcuts to any place worth going". -Anon
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Joined: Dec 2000
Posts: 51
Active BB Member
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Active BB Member
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Posts: 51 |
I would say get rid of Clifford intake. I ran one for several years. Started with an Edelbrock carb. Got it to run then swapped for a 32/36 DGEV Weber (progressive). It ran great, but still hesitated on accelleration. A couple of weeks ago, I ditched the Clifford and put my stock intake back on. I built an adapter for the Weber, but swapped the carb for a 38/38 DGAS, which is a little bigger, and synchronous. Runs great, idles like a champ, but pulls like Bull! Moondog
Inliner 4119 and proud of it
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Joined: Dec 2000
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Don't "give up the ship" this soon. Wait till you finish the exhaust system, break in and drive it some. Happy trails.
John M., I.I. #3370
"There are no shortcuts to any place worth going". -Anon
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Joined: Aug 2006
Posts: 224
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Posts: 224 |
makes me wonder how a carter 400 cfm 4bbl with a clifford intake would behave on a good 235/261? hmmm
you can lead people to truth, but you can't make them see it!
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Joined: Oct 2004
Posts: 204
Contributor
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Joined: Oct 2004
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Five degrees BTDC is insufficient with today's fuel. Try increasing the timing with the octane selector until the stumble goes away. That stumble is more ofen insufficient advance than a carb issue. I'd be willing to bet that the stumble will go away at between 7 and 10 degrees more advance on the octane selector. You will, of course, have to back it off if you get pinging under load or bucking against the starter.
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