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everything modern is nicasil lined bores and rubber o-ring heads. no gaskets on top. for base gasket, a rubber covered aluminum gasket.

Is it fair to say that a super efficient engine would have exhaust temps approaching ambient and exhaust pressures as low as possible?

it takes energy to bend and unbend the belt. which causes heat. so the faster it goes around, the more it bends, and the less efficient it is.

Thinking outside of the box, would it be possible to utilize a helix system such as a snowmobile uses, then augment it with a hydraulix assist? I'm thinking you could have the majority of torque supplied by the system, and move your requirements down to the order of 100 psi.