WELL MY PROBLEM COMES IN WHEN I HIT THE GAS AND GET OFF OF IT QUICK. THE ENGINE TENDS TO DROP VERY LOW IN IDLE OR SHUT OFF. ITS A 327 IN A 1971 CHEVELLE ITS GOT A; 270 DUR. HYD. CAM (ISKY),H.E.I. IGNITION,PERFORMER RPM INTAKE,A HOLLEY 600 C.F.M. VAC. SEC. CARB.

ITS FUNNY BECAUSE AS SOON AS I INSTALLED THAT CARB. THIS PROBLEM STARTED!!!!

ANY SUGGESTIONS!!!

THANKS!!!

I assume you've checked for vacuum leaks?

Sometimes moving old rubber hose around can cause small vacuum leaks where you wouldn't expect them.

-Bob Cunningham

I HAVE ALL NEW HOSES AND I HAVE CHECKED FOR LEAKS BUT NONE FOUND. COULD THE PVC VALVE HAVE ANYTHING TO DO WITH IT,KEEPING IN MIND IT ALL STARTED WITH THE NEW HOLLEY. B.Y.T. IT ALSO TENDS TO BOG ON HARD AND SOMETIMES LITE ACCLERATION ,MOSYLY WHEN ITS COLD , BUT SOMETIMES WARM ALSO. WHAT COULD BE THE CUASE OF THAT.

THANKS FOR ANY HELP

I hope you checked float level.

Is it ported vac.or manifold vac.?

Set air mix. for highest vac. then back one and a quarter turn.

Recheck timing before all else though.

HEY BUDDY I HAVE A 1970 CHEVELLE, IT HAS A 454 AND I REPLACED THE STOCK CONVERTER WITH A 3000 STALL CONVERTER WHAT A DIFFENCE IM RUNNING HI 11'S


PS. COULD BE CARB OR ADVANCE AJUSTMENT

WELL I ADJ. THE CARB. AND SET THE TIMING.
IT SEEMS A LITTLE BETTER, BUT IT STILL TURNS OFF.

THANKS FOR ANY HELP!!!!!

Hotrodder (name),
What PV is in the carb? Also, do as these guys say and double check float level. It sounds like it just needs some holley tuning. I see your from Long Beach, do you go to any of the local cruise ins? Oh, by the way, all caps is considered yelling and impolite. Just fyi.

Best of luck, maybe I'll see you around, there aren't too many so cal'ers on here.

Brandon

Thanks for any help!!!!!!!!!
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I was just playing with mine last night, so that is why this comes to mind.

Are you making sure to set your idle speed (rpm) with the engine completely warmed up? The throttle cam has little notches that make it run faster when it's cold ... but most carbs will go to the slow notch, when you kick it down.

Anyhow, just make sure not to set your idle with it on a high rpm notch ... Or, it will drop to nothing when you kick it down.

P.S. I don't write this to insult anyone, but we've all forgotten the little things before.

thanks for the help. seems to be running better but still drops in idle a bit!

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