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I have an original numbers matching '71 stock sbo 350 w/ 120K miles new intake manifold gasket & new oil pump, screen and oil pan gasket. Here are my numbers (below). Based only upon my limited reading and perusing of this site and others, I believe the number would fall somewhere between 135psi - 165psi? Just a SWAG.
It's on page 6C-3 of the 1972 Olds Chassis Service Manual. You DO have this reference, don't you?
It's actually quite general. All cylinders should be at least 100 psi, and the lowest-reading cylinder should not be less than 70% of the highest-reading cylinder.
I have an original numbers matching '71 stock sbo 350 w/ 120K miles new intake manifold gasket & new oil pump, screen and oil pan gasket. Here are my numbers (below). Based only upon my limited reading and perusing of this site and others, I believe the number would fall somewhere between 135psi - 165psi? Just a SWAG.
I recently sold a completely stock 350 out of a '72 with 100,000+ miles. Before I sold it I also did the wed/dry compression test and had numbers almost exactly the same as Norm's.
I have also found a couple of 76 motors in great shape 140 to 142 psi on my current one when had #8 heads and the 204/214 cam, same 8 to 1 compression . Oil pressure is another big sign of engine health, throw a gauge on it. The above, plus my personal experiences are why I love the Olds 350 so much. Try grabbing a brand "C" motor from that era, really just about any other brand. At minimum it will have either a flat cam or had it replaced. The only thing that usually needs replaced is the nylon coated cam gear. Many other brands also thought it was a bright idea, it was not.
August 4th, 2019, 07:44 PM
