i looked in my old chiltons from 1970. curious. the compression for a 200/220 is 21 to one. psi is listed from 284 to 327. so not saying anything, i assume that this is a cold test. and apparently the heat thing increasing the psi may have a critical point where it increases the pressure dramatically since the warm 80 degree test for the 603 with a mechanical ratio of 22 to one is 343 to 400 something.

additional food for thought.

tom w

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.