Subject	We can calculate the CR from what you have there
Posted by	Cjw3 on November 13, 2017 at 7:30 AM
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In Reply To	It would tell me if heads were machined... posted by Placuch on November 12, 2017 at 11:46 PM
Message	If you CC what you have.. Then add the Thickness of the head gasket, and then Bore/Stroke of a Std Block, you can work out your Present CR.. then do the Math to figure out how much likely has come off.. It's not perfect.. But it will get you in the ball park.. The Cranking Compression Pressure on my '95 NA that had Unknown heads installed during it's rebuild is about 225-230 PSI.. Likely a Bunch was taken off the heads sometime in the past.. I guess that is why I had to Change the Cam Timing by almost a tooth to get the Cam to Degree Properly.. Cj
Follow Ups	How deep? - Placuch 14:15:12 11/12/17 Find diameter of cam bearing 1/2 circle and add - JMartz 16:15:30 11/12/17 Your idea is good and it would work well enough - Placuch 16:35:20 11/12/17 How about just CC the Chambers? (n/m) - Cjw3 21:48:34 11/12/17 It would tell me if heads were machined... - Placuch 23:46:52 11/12/17 We can calculate the CR from what you have there - Cjw3 07:30:12 11/13/17 Re: We can calculate the CR from what you have there - Placuch 09:54:17 11/13/17 What heads do you have? - Cjw3 10:50:48 11/13/17 Re: What heads do you have? - Placuch 15:15:00 11/13/17
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