351M bogs when accelerator is kicked down
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Freshman User
Joined: Sep 2006
Posts: 25
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From: Duluth MN
351M bogs when accelerator is kicked down
Hello, I got a '76 Ranchero with a 351M. I got a problem...when I kick it down it has a slight stall before it really kicks in. My distributor had a stuck vacuum advance,so I replaced all that and it still does it. Although it does not backfire from the carb like it used to(it was retimed as well,so that could have been the backfire issue). All I can really think of right now is the timing chain(I still need to check that). Also,it appears that this was originally a 2 barrel carb engine,and someone threw on a Weind 4 barrel intake with a 750 Holley. I dont not believe they swapped heads either. Would that cause a problem like this?
Senior User
Joined: Jul 2006
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It sounds like a fuel delivery issue... 1. Either the accelerator pump (most likely) or 2. you need to re-jet the carb or 3. the float(s) is/are not set correctly. I would rebuild the carb and jet it correctly to rule out all three.
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Joined: Sep 2001
Posts: 30,255
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Hello- Welcome to FTE! I have moved your post to the specialized forum we have here for your question. Check out the list of tech forums we have on FTE. There is a wealth of information and expertise here to help you. There are a number of links in my sig below to help you also. Have fun! 
Check your accelerator pump stroke. That is also a VERY big carb for that engine and may be difficult to tune.
Check your accelerator pump stroke. That is also a VERY big carb for that engine and may be difficult to tune.
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