Quote:
Originally Posted by chatterbox5333
I've used Holley's Ultra Double Pumper for the last year. Right out of the box it worked without any tuning. If I may ask, why are you looking at the HP series? I believe HP series are vacuum secondaries. When I was shopping around for my carb, all the mechanics and factory reps I spoke to suggested to get mechanical secondaries for a Cobra with a manuel transmission. They claimed that vacuum secondaries would not always open to WOT with the combination of a light car, a street/strip cam, and a manuel transmission. I am by no means a mechanic, but that seemed to be what everyone was telling me that was in the business. Plus, the Ultra Double Pumper has an electric choke....
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All HP and Ultra HP carbs are mechanical secondary only.
All have no airhorn or choke mechanism.
HP are cast aluminium, Ultra HP are billet.