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Random B18 engine anomalies 140-160 1968

posted by  drj434343 on  Mon Jun 29 16:37 CST 2009
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last visit: Thu Oct 24 09:46 CST 2013
[RELATED]

I've done some more investigation. This afternoon I removed the carbs and began poking around in the manifold.

After inspecting the the gaskets between the carbs and manifold, then the manifold and the head, I noted that they all looked brand new. This is probably due to the head gasket being replaced by the previous owner about 6 months ago. I'm guessing he decided to replace those gaskets when the head was off. At any rate, all the gaskets looked good to my eyes.

However, as you can see from the manifold picture, it appears I have those secondary butterflies, as you call them. I noticed that there appeared to be quite a bit of play in both their shafts. Could these be letting in enough air to be all of my problem?

While playing around with everything, it seemed like those secondary butterflies would actually open up when the throttle was wide open. Can I really just totally remove them and plug the hole?





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