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I believe that if the aluminum elongated by 1/8” that would make the piston to head clearance increase and a cold engine would be the worst case, since the steel crank and rods are not expanding at that rate.
The engine is constrained in all the right places by steel. That is why I keep harping on using the right head bolts. The expansion of aluminum is sucked up by more tension in the head bolts, and distortion in the cylinders. Same for the case. The case through bolts constrain the mains. It’s all a very clever steel “cage” around the critical aluminum features. That is the engineering of it.
Last edited by Speedy Squirrel; 03-27-2022 at 04:22 PM..
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