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Old 02-18-2005, 09:38 AM
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Holley 750 on a 454, what jet size?

Hi all, I have a question about where I should start on jet sizes for my Holley 750? I'm getting ready to rebuild this double pump carb (mechanical secondaries) that came off of a SBC. My BBC will probably need different jets, so I figure while I have it open I can put in jets that are around where I will need to start.

My combo:

454 .040 over = 462 ci
Stock 049 casting oval port heads
10.2:1 compression Hyper-eutectic pistons
Comp Cams XE268H - 268/280 duration (224/230 @ 050) 515/520 I/E lift
Weiand 8013 dual plane manifold (Idle - 6500)
Proform HEI
1.7:1 Stamped steel rockers

Any suggestions would be appreciated.

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Old 02-18-2005, 09:48 AM
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Just a guess to get you in the ballpark, 78 front and 84 rear.
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Old 02-18-2005, 09:52 AM
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Stock Holley jet sizing on Mortec.com.
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Old 02-18-2005, 04:01 PM
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Thanks guys, this gives me an idea where to start.
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Old 02-18-2005, 07:34 PM
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Start with the stock jets. Drive at various speeds from 10 mph to 60. See if there is any lean surging. If so jet up. IF not you are probably on the money.
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