70 454 Rebuild
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Joined: Mar 2003
Posts: 98
Likes: 3
From: Oglesby Illinois
70 454 Rebuild
I have rebuilt my 70 454 after a piston broke. The car ran fine before this event. After the rebuild the car runs but the carb is definitely putting too much fuel in the motor. I have to keep it at 1500 to keep the motor running. Does this make sense? I did get a new fuel pump and i also changed the gasket on the carb to intake. The original gasket separated the 4 openings the new gasket is open. Any ideas?
Thanks.
Thanks.
Burning Brakes
Joined: May 2008
Posts: 860
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From: Stratford Ontario
What do you mean the carb keeps puting too much fuel in it? If its because you have to hold it at 1500 to run then all the advice above is correct. I would check for a vacum leak first, assuming your saying too much gas is holding gas pedal. Keep us posted and pics of your new big block would be cool.
Race Director
Joined: Sep 2002
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From: San Diego - Deep Within The State of CONFUSION!
Team Owner
Joined: Jan 2006
Posts: 37,637
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From: Crossville TN
Attention!! You can't "see" a vacuum leak...and, with the motor running, you can't hear it, either. The only way to know is to measure 'baseline' engine vacuum level, then check with everything hooked up to see if there are vacuum losses in the system.
From your description of the problem, I would suspect timing problems, vacuum leakages, and/or wrong gasket on the carb. Checking the fuel pump for too much pressure (for a stock carb) is a good idea. If psi is too high, fuel will just force its way past the needle valve.
From your description of the problem, I would suspect timing problems, vacuum leakages, and/or wrong gasket on the carb. Checking the fuel pump for too much pressure (for a stock carb) is a good idea. If psi is too high, fuel will just force its way past the needle valve.
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Thread Starter
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Joined: Mar 2003
Posts: 98
Likes: 3
From: Oglesby Illinois
Turned out to be a little of all three, vacuum, carb gasket, and timing, mostly timing. My helper set the timing per the book we had not how we pulled it out of the car. Last night i pulled the distributor and set how it was before the piston broke and now the car runs good. Thanks for the help. I am not sure how to attach pics but i did create a public album with pics of the rebuild.
