Percy's 4150 dial a jet?
 

I have 454 mag with a 177 Weiand and I boat between 3' and 7,500' and changing jets it getting old.
Does anyone have any experience with the Percy's infinite fuel adjustmant for the 4150 Holley?
Thanks

No experience in Percy's i do however in a Willy's. I f you have not bought the Percy's yet give Willy a call.

http://www.willyscarbs.com/

Dial-A-Jets work okay for what you're talking about.
They will never meter as accurately as a sized orifice, but they make life easy for an altitude hopper.

I've got several sets of unopened Dial-A-Jets that will work on the HP series. Make me an offer.

MC

I am currently running some 'adjust a jets' in my Demons from Percy. They have really made it a lot easier to dial things in... I believe I have the original set for the Demons. Percy is hell of a nice guy, his parts have made my life lots easier.

I agree with Car Biz ,if you havent bought one yet give Willy's a call,very nice carbs.it takes about 30 seconds to change jet sizes.