Re: replacing the 55 400 intake manifold

Posted by HH56 On 2025/4/12 19:07:56

I've had good luck with mine coming out but PGH Ultra is correct in that they can be a pain to remove. One thing to double check on the manifolds is the condition of the tube pressed into the manifold. That is the actual "stove" and is a special tube with a crimped opening on the far end which sticks out in the air under the manifold. The crimp is designed to close the tube to limit air flow so the specific amount that does get thru has a chance to be heated. The tube is in direct contact with exhaust gases which can corrode the tube to the point holes develop in the tube. That is not good because then the choke sucks the exhaust gases up which then damages the internal parts of the choke. Make sure your new manifold tube is in good condition before it is installed.



One other thing I noticed on the photos you posted is the carb linkage looks like there is soot on it. It could just be optical delusion or a dirty carb piece but another thing is the end of the removable tube just before it goes into the manifold tube has two dots which could also be an illusion but looks like holes. If in fact they are holes then they should not be there and that tube will need to be repaired or replaced. If soot is present the stove is allowing exhaust to enter and as mentioned, that is not good for the choke mechanism
.