300 carb upgrade
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Senior User
Joined: Mar 2017
Posts: 395
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From: Everton MO
300 carb upgrade
i would like a higher end output on my 78 ford f100 custom and i am puting a 2300 holley 2 bbl 390 cfm street avenger with a 4 barrel offie intake on it. i know never to use a 2 bbl on a 1 bbl intake because of the restriction in the intake. does anyone know any problems with what i am doing and will i need to set the timing again even though the cfm never exceeds the max of that engine? so basicly will i have to do anything else?
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Senior User
Joined: Mar 2017
Posts: 395
Likes: 1
From: Everton MO
this is the carb https://www.summitracing.com/parts/hly-0-80350 and this is the intake https://www.summitracing.com/parts/ofy-6019dp and this is the adapter https://www.summitracing.com/parts/mrg-1933 will they all bold up ok because there are no stats for bolt distances on this street avenger
Post Fiend
Joined: Apr 2002
Posts: 19,311
Likes: 97
From: Waterloo, Iowa
Any carburetor that will bolt up will probably run, but there's more to it than that, you'll have to set it up and adjust it, making sure the right parts are installed for your particular truck and operating altitude. The manuals for just about any carburetor are available for download online. Read them and study them, there really is no way around this. Someone said a carburetor is just a "calibrated fuel leak" or somesuch. That's about right, it will waste gallons of fuel every tank and won't run much different than when setup right. A tach and a mechanic's vacuum gauge is a great help in engine tuning and diagnostics.
Fleet Mechanic
Joined: Sep 2014
Posts: 1,626
Likes: 78
From: NE Texas
Multiple folks suggest adding EFI exhaust manifolds to replace the standard log exhaust, and some advocate installing Chevy 250 rockers. Those are both less expensive options than swapping the intake and carb. I am not the authority on either.
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