turbo motor compression: 21.5:1
non turbo: 21:1

I was thinking of using a 617.952 lower block because of the oil jets to lube and cool off the pistons and usinga good head from the non turbo motor making necessary changes so it runs good ie change camshaft etc

I have found the non turbo to be quicker off the line and doesnt have the turbo lag

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1986 300SDL, 211K,Dealership serviced its whole life
1991 190E 2.6(120k)
1983 300D(300k)
1977 300D(211k)