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Classic Mustangs Tech Forum

Technical discussions specific to 1964-1967, 1968-1970, and 1971-1973 Classic Mustang. Discuss all tech related to in-line six cylinder and V8 powered Vintage Mustangs here.

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Unread 01-28-2013   #1 (permalink)
MRupp79 is offline Rookie


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Default 351w Bogging down as it...

my pony's sick - its boggin down when i touch the slightest bit of pressure on the accelerator, thought it might be the spark plugs though they were changed out in March of 2012...what i noticed is the guy i bought it from made a Frankenstang...it has two different heads on it...mustang specialties in pompano beach, fl put a new Holley HP 750 carb on it and changed out my fuel filter and fuel line a year ago...not sure whats causin the issue but the pretty girl stalls out on me i have new gaskets as well recently installed...i have no clue????????????!!!!
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Unread 01-29-2013   #2 (permalink)
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What's your timing set at? Take the air cleaner off an make sure you can see fuel squirt when you pull the throttle
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Unread 02-03-2013   #3 (permalink)
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I concur. It sounds like an accelerator pump issue. B
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Unread 02-05-2013   #4 (permalink)
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if its more of a stocker then i think 750 is too big. too much fuel for your engine to handle is most likely your issue.

having different heads is a problem. . . things might always seem a bit off with different compression. what you do might help one cylinder band and hurt the other.
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Unread 03-16-2013   #5 (permalink)
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i thought so too that the 750 was too big causing accelerator issues that either flooded the engine with too much fuel or offered problems with problems through the carb, but it runs great for the first few miles????? so not a timing issue, just starts to misfire and than shuts down???? my friend thinks it may start to overheat but I think it is still something with the accelerator
I will let you know I will know real soon as we are working
thx guys!!!!
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Unread 03-18-2013   #6 (permalink)
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I know for my 289 the max cfm's is 600. Some say I could get away with 650 cfms but I may be opening Pandora's box to additional problems and/or having to change out the crank, cams, and lifters.

So for a 351 at 750 cfms may be a bit high.

My buddy has a 70 Torino with a 429 super cobra jet and he is running at 750 cfms.

See if you can find a 600 or 650 cfm carb and see if the bogging goes away?
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Unread 03-18-2013   #7 (permalink)
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Quote:
Originally Posted by MRupp79 View Post
i thought so too that the 750 was too big causing accelerator issues that either flooded the engine with too much fuel or offered problems with problems through the carb, but it runs great for the first few miles????? so not a timing issue, just starts to misfire and than shuts down???? my friend thinks it may start to overheat but I think it is still something with the accelerator
I will let you know I will know real soon as we are working
thx guys!!!!

Im not clear on your symptom? In your original post you indicated it bogged when you hit the gas, In this post you indicate in runs ok for a few miles and then shuts down. Please explain your problem in more detail. If your car runs good and then shuts down, it could be a restricted fuel system. If it stumbles when you hit the gas, could be accelerator pump or low speed circuit.
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