Quote:
Originally Posted by Flathead Fever
Our fleet of vehicles at work had to constantly go up and down a 7000' mountain under a heavy load with the gas pedal buried to the floor for long periods of time. At night the exhaust manifolds became a dull red. They do eventually warp to the point the bolt holes do not line up with the heads holes by half the bolt diameter They even make a tool to spread the manifold so you can get the bolts lined up. Eventually the pressure on the bolts snap them off flush with the head. But how many heating and cooling cycles did that take, hundreds maybe even thousands of times before the manifolds finally warped, cracked or broke bolts. All you can do is make sure the crank's line bore is straight,the block deck is not warped and there are no cracks.
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Sounds like 350 Chevy pickups of the70's-80's era. I think that was a design flaw. Other brands didn't have this problem.