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Old 01-11-2012, 04:26 PM
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what carb?

ok fellas
you guys have never let me down so far so here goes.
i have a stock rebuilt 1981 ford 302 engine.
i got it with a holley 4412 carb.
it is my understanding that the carb is primarily used by circle track racers
and as such doesnt really belong on this engine.
my question will probably seem out of place on a hotrod forum but
what carb will give me the very best gas milage in a 2300lbs car with a 3.00 rear end and c6 tranny?
i rarely go over 65-70mph

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Old 01-11-2012, 04:43 PM
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I would run a Holley 4160 model carb -600 cfm, vacuum secondaries. 600 cfm should be plenty of fule for a stock 302ci. Part# hly-0-80452
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Old 01-11-2012, 05:01 PM
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Quote:
Originally Posted by billy zz
ok fellas
you guys have never let me down so far so here goes.
i have a stock rebuilt 1981 ford 302 engine.
i got it with a holley 4412 carb.
it is my understanding that the carb is primarily used by circle track racers
and as such doesnt really belong on this engine.
my question will probably seem out of place on a hotrod forum but
what carb will give me the very best gas milage in a 2300lbs car with a 3.00 rear end and c6 tranny?
i rarely go over 65-70mph
i would think it would be pretty close to the best carb, if its not jetted too rich

I dont know that much about 2 barrels

maybe a smaller one
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Old 01-11-2012, 05:14 PM
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i havent opened it up yet.
but i did take some vacuum movies.
one is of the engine in drive

and the other is me punching the throttle


from what i have read i should put the automatic tranny in drive and the divide my vac reading by 1/2 and that would be the correct power valve to use.
so i guess that would be a 6.5 Hg
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Old 01-11-2012, 05:19 PM
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i just don't want it to die at stoplights and bog way down when accelerating anymore
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Old 01-14-2012, 11:15 AM
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i just bought this on ebay (hope it's the right one)

Holley #37-1543 Carburetor Rebuild Kit NIB Fast Kit Model 2300 2 barrel
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Old 01-16-2012, 06:26 AM
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there are apparently 1000's of variables.
so i am going to use the holley fast kit and start from there.
(besides the vacuum tests,fuel level check i have already done)
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Old 01-16-2012, 07:16 AM
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ignition timing and idle a/f ratio also effect engine vacuum.
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Old 01-16-2012, 07:33 AM
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i dont know enough about engines to feel very confident.
but i will try my best.
and if things just dont work out for me.
i will save up the money and tow it to a mechanic that CAN make it run properly.
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Old 01-16-2012, 07:35 AM
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In the bottom picture I see maybe .5, none in the other, almost no vacuum at all...what am I missing??
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Old 01-16-2012, 10:49 AM
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Quote:
Originally Posted by 68NovaSS
In the bottom picture I see maybe .5, none in the other, almost no vacuum at all...what am I missing??
in gear (it's an automatic tranny) at idle
16
those photos i posted are movies.
click on them to watch.
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