Carb Jet Size

cuveeMember

Just came by a Ford Holley 735cfm 4150 carb with 70/79 jets. (to big!?) Can anyone tell me which size jets to start with for a stock 351C??? Thanks for the help

10/30/027:27 AM

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Original Post

Wataboutbob (Guest)

I recently dyno'd my engine equipped with a 750 DP jetted 78 primary and 80 secondary.

Initially the average BSFC was low so we increased jet sizes to 79/81. Power and torque improved but BSFC was still low. We then upped the jet size to 80/82 - increases in avg HP and torque again. I was happy at this point and stopped here but I think conventional wisdom will tell me I've gone too far...but I can't argue with the numbers.

Your mileage may vary...
Bob Eaton

10/30/027:43 AM

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