Holley tuning question
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Holley tuning question

  1. #1
    21' Daytona DaytonaTunnel's Avatar
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    Default Holley tuning question

    Not on a boat, but on my `67 Fairlane Hardtop. Factory 390 4V Holley. I can't seem to get the surging out of it. If I set the timing where it runs good, it pings and surges. If I back the timing off, it's lazy and comes to an idle slowly, and just plain ol idles/runs like crap (along with drinking the fuel...more than to be expected). I can't remember the number of the carb off hand, but it's a factory `67 4V application. The engine has a mild cam and true 2.5" exhaust, nothing special. I've checked for vacuum leaks and have the correct PV's in it.

    Looking for a little insight on something I may be missing ??? Thanks guys !!!

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  3. #2
    21' Daytona DaytonaTunnel's Avatar
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    Oops, forgot it has a MSD 6AL as well.

  4. #3
    steelcomp was here
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    Quote Originally Posted by DaytonaTunnel View Post
    Not on a boat, but on my `67 Fairlane Hardtop. Factory 390 4V Holley. I can't seem to get the surging out of it. If I set the timing where it runs good, it pings and surges. If I back the timing off, it's lazy and comes to an idle slowly, and just plain ol idles/runs like crap (along with drinking the fuel...more than to be expected). I can't remember the number of the carb off hand, but it's a factory `67 4V application. The engine has a mild cam and true 2.5" exhaust, nothing special. I've checked for vacuum leaks and have the correct PV's in it.

    Looking for a little insight on something I may be missing ??? Thanks guys !!!
    Check the vac advance diaphragm. Are you disconnecting this when you set your timing? Also, check for a worn out distributor. Worn points plate, worn shaft, just plain worn out.
    If God is your co-pilot, change seats!
    Acts 2:38, the perfect answer to the perfect question.

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  6. #4
    21' Daytona DaytonaTunnel's Avatar
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    I am disconnecting the dist vacuum when setting base timing, and have sucked on the vacuum line while engine is running...rpm's increased. I have not pulled the distributor out to see what shape it's in. A good idea, maybe send it out to have the curve checked as well.

  7. #5
    Senior Member GT Jets's Avatar
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    Something jumped out at me when I read this, has it ever run well?, sounds like it jumped time (cam), what is the vacuum at idle?, maybe plugged exhaust also, would explain the pinging...

    Sometimes the answer is so simple you look right over it...

  8. #6
    Cantard 71hallett's Avatar
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    Quote Originally Posted by GT Jets View Post
    Something jumped out at me when I read this, has it ever run well?, sounds like it jumped time (cam), what is the vacuum at idle?, maybe plugged exhaust also, would explain the pinging...

    Sometimes the answer is so simple you look right over it...
    Good point. What are you setting the base at? Vac would /could also tell a story. What are your points gaped at?
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