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Old 06-03-2009, 06:29 PM
Johan Lokander's Avatar
Johan Lokander Johan Lokander is offline
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Tuning a Holley

I have my 454 running now and it works cuite good, but i have some carburator tuning to do to gett it perfect, and sens my experiens whit Hollys are limeted I have some cuestions.

When I first started the engine I had the idel mixure screws ca. 2 turns out, and when I tried to adjust it it dident sems to be mutch difrent when i turnd it in or out.
If I turned it in mutch the engen died but ther wasent anny RPM encres when I turnd it out.The idel whas bad and the engine culdent idel for werry long befour it died, and I had to be werry gentel on the trottel befor i had get the RPMs up a bitt, our the engine died.
Then I turnd the mixture screws out more, dont know how manny turns, but I wold say I cant turn them out mutch more, and the idel RPMs whent upp and the idel gett mutch more stabil.But when I have the car in gere I stil have to be werry gentel on the trottel our the engin bogges out...

I have some experiens in Weber carbs, and if i wold have the same problems on a Weber, I wold have change the idel jet to have the same idel mixture I have now but whit the mixure screws 1,5-2 turns out insted of nerly all the way aut, and then the mixure wold be better when the transfer slots opend, but as I anderstand it Hollys dont have idel jets...

The Engine is a .030" over 454 whit oval port heads.
10,25-1
270 degre cam whith .538" lift
and the carb is a Holley 750 vac
Thanks!
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