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Carb for a 385hp Ford Crate Engine?
Engine: Ford Motorsport 351W 385HP
Carb: Rebuilt 750 Holley with Vacuum Secondaries Problems: - We keep getting misfires under load (during accelleration) with 3/4 throttle between 3500 and 5000 RPM. - Minor Backfiring. - We've been playing around with it but can't get consistant accelleration. We've Checked: Timing Good Distributor Replaced Plugs and Wires Replaced Premium Grade Fuel Any recommendations? |
Dump the carb........You need no more than a 650dp Holley (#04777C), Moroso 1:1 secondary linkage kit, and some dyno tuning time.........I should know, I went through 6 carbs on my last 351W/385hp Ford crate engine before finding someone with a chassis dyno.............After two hours on the dyno with the new carb, it was running at peak performance and efficency............
Bill S. |
Hey Bill....
No way to use the 750, huh?
What's the jetting and shots on the 650 you're using? Thanks! -Drew |
Guys, not that I know much but.......
Cubic Feet Per Minute Needed Formula: CID * max rpm / 3456 = CFM needed Example: 302 * 5500 = 1,661,000 (divided by) / 3456 = 480.6 CFM One of those things I could never get out of my head..... |
Sounds like you are running lean. Look at the plugs to confirm and try upping the jets. That cam really needs a DP though. I run the recommended carb for that motor - model 9379 with 68 / 81 jets. The motor has bigger heads though - AFR 185
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Re: Hey Bill....
Shots were not changed, jets according to my notes are 72/68's with the Moroso 1:1 linkage kit and the choke horn milled off......
Bill S. Quote:
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Had a buddy with the exact engine and problem. Changed to a Holley 650 and problem went away. 750 to much.
Just my 2 cents |
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