Hi! I bought a new carb for my engine. Holley 750 double pumper. Engine has a healthy cam, unilite ignition, headers with a free flow exhaust, and a dual plane intake. It's a 351 cobrajet. 4v heads of course. Anyone has experience with jetting that carb for that engine? I interested in the main and secondary jet sizes and the acc pump discharge nozzle size. Thank you! Robi.
Keep the stock jets. Change to a 8.5 power valve and you might have to go larger on the shooter if you have tip-in hesitation.
You can do a lot with the accelerator pump cam without changing the nozzles. Get a kit with all of the cams--very cheap. Run it and look at your plugs and exhaust tips. Most of the carb manuals say to determine jets by quarter mile et. If it isn't pinging, you are probably close. Of course, the best way to find out is with a gas analyzer. You can also buy externally adjustable jet plates for both ends of that carb from Percy's (through Summit). I am going to try one on my 600 double pumper on my current project.
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