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SignUp Now!pfredric said:Here is the sonic check I got for an 85 hot air block that had 100K miles:
http://home.comcast.net/~fredricp1/Paul/GNProject/4140SonicMap.JPG
chevyII said:aftermarket blocks are only .250. I had a stage1 sonic checked and most thrusts were .170-.190. Between the cylinders is were things got tight .077,.090,.120. Production blocks including stage1's were mass machined were stage2's were done by buickmotortsports. 3/16 is a good number for stage2 blocks,doubtfull to find a stocker that thick.