351 4bbl
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Joined: Jan 2008
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From: pg b.c
Originally Posted by baddad457
They weren't unique, same basic carb was used first on the 83-85 Stang HO 5.0. Truck 390's never got 780 cfm Holleys, if there was one there, someone other than Ford put it there. 390's only got 600 cfm carbs from Ford. The 428CJ's and a few other Hi-po Fords got 735's. I think one of the hi-po 429's might have gotten a 780, the Boss 302's did as well.
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Joined: Jan 2008
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From: pg b.c
Originally Posted by baddad457
Not even the F600, 700's and 800's used a carb that big from the factory. If it was there, someone other than Ford put it there.
Hotshot
Joined: May 2003
Posts: 11,141
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From: south louisiana
The FT's(391 = FT engine, same basically as a 390, but different internals & heads) usually had smaller carbs than the others. These were built for low rpm pulling and didn't need a big cfm carb.
Senior User
Joined: Jan 2008
Posts: 440
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From: pg b.c
Originally Posted by baddad457
The FT's(391 = FT engine, same basically as a 390, but different internals & heads) usually had smaller carbs than the others. These were built for low rpm pulling and didn't need a big cfm carb.
Cargo Master
Joined: May 2007
Posts: 2,071
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From: British Columbia
I pulled a small Holley 4V off of a 477 Super Duty engine in a scrap yard some years ago, it turned out to be 370cfm.
After removing the governor stuff and making linkage I put it on a 260, where it performed much better than the bigger (600cfm?) carb that it replaced.
The big truck Holleys are quite distinct with the governor controls, idle circuit on the secondaries, two power valves, cast iron base plates etc. However they do make great carbs for small V8s with some (a lot) of work.
After removing the governor stuff and making linkage I put it on a 260, where it performed much better than the bigger (600cfm?) carb that it replaced.
The big truck Holleys are quite distinct with the governor controls, idle circuit on the secondaries, two power valves, cast iron base plates etc. However they do make great carbs for small V8s with some (a lot) of work.
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