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I would think it would be not retaining the heat in the cylinder and head. My Indy engine would lose a tenth leaving at 160 instead of 200 degrees. IMO


I guess that makes getting heat in the engine even more important for those running alcohol.

One other difference is the thermal growth effect on cam/valve lash. With Aluminum heads on an iron block I was using ~0.005" tighter cold lash to get the hot lash correct. I have heard a lot more when running both aluminum heads and block. Any experience? 0.015" ?




zero lash cold...