According to the 1938 Shop manual, the follow is the procedure:

Bring the engine up to operating temperature by running it at 600 RPM for 20 minutes. Remove all the spark plugs and check the compression on each cylinder. The compression should be 90 PSI with a variation of no more than 5 to 10 LBs.

I started my 38 216 after it ahd sat for 31 years in a barn. I used a spare carb, fuel pump and coil and it started right up. The compression cold ranged from 90 LBs to 130 LBs. I think there is a lot of carbon in some of the cylinders.

Oh and the oil pressure was a very good 14 Lbs, even when warm. However I had to shut it down after about 15 minutes because it was going to overheat. I think the rad may be plugged.

Last edited by truckernix; 05/16/2010 2:46 AM.

1951 GMC 1 Ton Flatbed -- It is finally on the road and what a great time I have driving it!
1951 1 Ton Completed


My Chevy Master 4 Door is on the Road!