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68gmsee · 11-01-2017, 11:15 AM

Good replies above. Lubing the cylinders and letting it set overnight is a good idea.

After insuring it turns over freely maybe shoot some transmission fluid or light weight oil with oil squirt can and crank it without the plugs using a good, fresh battery. This will shoot out most of the excess oil out of the cylinders.

Then, also as mentioned above don't rely too heavily on the compression test until you are able to run the engine for a while. A lot of components may be sluggish like valves, lifters or rings gummed up that can give false readings.

11-01-2017, 11:15 AM	#6
68gmsee Active Member Join Date: Jul 2007 Location: Centrally located between Houston, Austin and Waco. BCS area. Posts: 7,947	Re: Compression test for 305 v6 Good replies above. Lubing the cylinders and letting it set overnight is a good idea. After insuring it turns over freely maybe shoot some transmission fluid or light weight oil with oil squirt can and crank it without the plugs using a good, fresh battery. This will shoot out most of the excess oil out of the cylinders. Then, also as mentioned above don't rely too heavily on the compression test until you are able to run the engine for a while. A lot of components may be sluggish like valves, lifters or rings gummed up that can give false readings. __________________ 68 GMC 250/3 speed Saginaw p/b p/s 69 Chevy 350/350 currently in pieces still lookin for a cab 06 Trailblazer I just want a vehicle that I can work on, that won't talk to me, leave error msgs or keep track of how I drive...