400 tune up blues
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New User
Joined: Dec 2005
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400 tune up blues
my truck is blowing black smoke out of the exhaust. I replaced the plugs, cap and rotor. It has a new carb. motor is a 351m converted to a 400, 4barrel holley 600 What is the correct timing for this. Help
Fleet Owner
Joined: Jan 2004
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From: Brentwood,CA
holley should have given you a check list of stuff to do to it before even mounting it. you will need to adjust mixture screws,choke, and install a power valve to work with your enigne. take the vacuum of the engine divide by 2 and use a power valve with the same number.
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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 here. 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! 
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I guess I will need to get a vacuum gauge. The instuctions said adjustment are preset at the factory and should not need any adjusting, but it does explain how to adjust if needed... Looks like I will give it a try
Moderator
Joined: Dec 2001
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From: Louisville,Ky.
The first thing I would check once you verify that the choke is opening is the float level. Look down the throttle bores at an idle and see if gas is dripping into them from the venturis. If so, then one of the floats is too high or has a piece of debris in the needle and seat.
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