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Mod | | | Forums66 Topics128,066 Posts1,055,874 Members48,428 | | Most Online14,466 Apr 26th, 2026 | | AD Chevy Trucks Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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on the Internet for over 30 years! and not clogged down with Ads! Again, thanks! | | | | Joined: Sep 2005 Posts: 1,028 'Bolter | | 'Bolter Joined: Sep 2005 Posts: 1,028 | Ok so I get the following results
(these are new plugs) cyl 1 120# plug is tan cyl 2 120# plug is tan cyl 3 110# plug is black cyl 4 110# plug is black cyl 5 110# plug is tan cyl 6 118# plug is black (little oily)
I tested each cylinder twice and there was little variation. I was not able to see the pressure come up (to check for valve issues)as I was doing this alone and couldn't crank and watch the gauge at the same time.
These readings seem high. I do get black carbon out of the exhaust. The plugs were better after driving for some time. I have only driven it a few dozen miles but lately I have been working on it and it just runs in the driveway.
If this is due to carbon build up in the cylinders will it resolve over time driving it more frequently?
Rich
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