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 - Tractor Profile: Allis-Chalmers Model G - by Staff. The first Allis-Chalmers Model G was produced in 1948 in Gasden, Alabama, and was designed for vegetable gardeners, small farms and landscape businesses. It is a small compact tractor that came with a complete line of implements especially tailored for its unique design. It featured a rear-mounted Continental N62 four-cylinder engine with a 2-3/8 x 3-1/2 inch bore and stroke. The rear-mounted engine provided traction for the rear wheels while at the same time gave the tractor operator a gre
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