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tinman565

04-15-2010 05:39 AM

hp500 jets

OK..I know this has been asked before, but what is the FINAL answer on jetting an hp500 Carb on a single plane intake? Square jet it...or staggered? Its my understanding that the carbs came both ways. Thanks.

Griff

04-15-2010 12:33 PM

The Merc HP500 carbs all had staggered jetting from the factory.
There is no FINAL answer. Its all a matter of opinion and unlees you are running it on a dyno and trying to get every last bit of hp out of it, there is no way to tell for sure.

blue thunder

04-15-2010 05:02 PM

Unless you are running a hp500 totally stock, square it up.

ezstriper

04-16-2010 06:09 AM

just finishing my .030 500 w/850 and full headers where would be a good starting point on jetting ? thanks Rob

blue thunder

04-16-2010 11:21 AM

Quote:

Originally Posted by ezstriper (Post 3088478)

just finishing my .030 500 w/850 and full headers where would be a good starting point on jetting ? thanks Rob

Call holley and find out what the out of box marine 850 jetting is. Then add 5 jet sizes to those numbers and you will start a bit rich and can lean from there.

BT

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