Hot can add 5 to 10 lbs on a compression test. 150 was in the low end of what it should have been, but still ok. Going from 150 to 175 isn’t that unusual after a lifter adjustment, a sign it was running too tight. Sometimes the lifters bleed off and don’t recover as fast as you might expect also, more true these days when lifter bleed rates vary quite a bit. it It may not stay at 175lbs if you tested it right after adjusting the lifters. Altitude and atmosphere conditions effect the pumping compression too. Hopefully it runs better for you.
If your not running all the emission controls I think you will want to back off the timing from 18. The emission controls shut the vacuum advance off until the engine reaches a minimum temp. I think that was why they ran so much initial. If the emission equipment is all hook up yet it probably needs to be at 18 like it says.
Last edited by Jay S; 08-07-2023 at 07:09 PM.
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