Holley 750

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Dec 4, 2003 | 06:47 PM

Bill Roach

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Joined: Apr 2003

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Holley 750

I have a holley 750 I am going to put on stock 460 with dual exhaust.

I am wanting to know what size jets I should use, and power valve size?

It is vaccum secondary with plain spring, 72 main jet and 65 power valve.
I don't know what size the metering plate is in the secondary.

Thanks

Dec 6, 2003 | 01:27 PM

georgedavila

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Joined: Aug 2001

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From: Nevada

Should be fine as is. 6.5 is the standard power valve on all non-dominater Holleys.

Dec 6, 2003 | 01:46 PM

Vince dEon

Cross-Country

Joined: Jul 2003

Posts: 93

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With my Holley (see signature) I wanted to play around with the power valves as well. I hooked up a vacuum gauge and took it for a drive, up and down hills, to see when the secondaries kicked in. It is really the best way to figure out the power valves. Do this test with your truck loaded the way it would be normally. This advice came to me from a Holley nut at the local performance shop.