Reading your post, I don't see where you say which manifold isn't straight. Maybe I missed it. If its the intake that has a gap, that certainly will cause a problem of low vacuum which will affect fuel to air mixture, cause it to run lean and hotter. If its the exhaust, not so much beyond noisy. As far as torqing it down harder to get it to formed into place, don't go harder than spec, you could crack or break it. Intake manifold vacuum is generally pretty low, enough to cause turbulance to mix the air and fuel, but you absolutely need it. To me, seems kind of odd to have an intake manifold warp because they generally are a cooler part of an engine. I'd say try new gaskets, and Permatex No. 2 (NOT No. 1).
Bottom line is if the intake leaks, gonna run lousy. If exhaust leaks, louder, not worse.
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Today's Featured Article - Grain Threshing in the Early 40's - by Jerry D. Coleman. How many of you can sit there and say that you have plowed with a mule? Well I would say not many, but maybe a few. This story is about the day my Grandfather Brown (true name) decided along with my parents to purchase a new Ford tractor. It wasn't really new except to us. The year was about 1967 and my father found a good used Ford 601 tractor to use on the farm instead of "Bob", our old mule. Now my grandfather had had this mule since the mid 40's and he was getting some age on him. S
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