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Old 02-05-2012, 09:01 AM
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Runs rich when first starting engine

I am running a 750 cfm holly on a Ford 351W crate engine from Ford racing. When I first start it up cold it runs very rough for a few minutes while the chock is on. After warming up it seems to be alright. My question is, is this to much carb for the engine? And, can I adjust the choke and if so how do I do it?

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Old 02-05-2012, 09:08 AM
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Pretty normal for any carbureted engine to run a little rich when cold. You can adjust the choke, but if you go too far the engine will continue to die until it warms up. To adjust it pull the air cleaner when it's stone cold. Loosen the choke screws that hold the cover and turn the cover clockwise until the choke plate opens. (hold the throttle slightly open to allow the choke plate to move!) When it just starts to open STOP and tighten the screws. Don't go past barely open, or it will want to die when cold.
A 750 Holley is a little large for a 351, unless it's a pretty well built 351. If it's vacuum secondaries it's a bit more forgiving.
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