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| | Forums66 Topics128,051 Posts1,055,767 Members48,426 | | 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!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
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#30178 10/08/2002 3:42 PM | Joined: Nov 2001 Posts: 122 Shop Shark | | Shop Shark Joined: Nov 2001 Posts: 122 | While installing my newly repaired head on my GMC 248 I noticed, after cleaning the face of the block before laying down the head gasket, there were numbers that appeared to be stamped in the block next to each cylinder. They were, (if memory serves), a 4 (next to cylinder #1), a 7 (next to #2), a 3 next to #3 & 4), a 5 (next to #5), and a 4 (next to #6). Just curious as to what these numbers were for or their meaning?  | | |
#30179 10/10/2002 4:28 AM | Joined: Nov 2000 Posts: 427 'Bolter | | 'Bolter Joined: Nov 2000 Posts: 427 | Are these stamped on the face, the spark plug side or the manifolds side? | | |
#30180 10/10/2002 8:40 AM | Joined: Nov 2001 Posts: 122 Shop Shark | | Shop Shark Joined: Nov 2001 Posts: 122 | OldCarKook,
They are on the manifold side right next to the cylinder openings on the top of the block, (the part of the block you'd lay the head gasket down on). Thanks | | |
#30181 10/10/2002 12:29 PM | Joined: Jan 2000 Posts: 206 Member | | Member Joined: Jan 2000 Posts: 206 | These are sizing marks used by the factory to match pistons to bore size. If you have the original pistons, the crowns should be stamped with numbers that match the ones on the block. | | |
#30182 10/10/2002 12:36 PM | Joined: Nov 2000 Posts: 427 'Bolter | | 'Bolter Joined: Nov 2000 Posts: 427 | Six Pack in with the kill! Any day that I don't learn something new is a wasted day. Today is not a wasted day.
Thanks to the ever deep knowledge of the stovebolt resident of the home of spring training for our (losers) Red Sox! Thanks Jack. lol | | |
#30183 10/10/2002 3:23 PM | Joined: Nov 2001 Posts: 122 Shop Shark | | Shop Shark Joined: Nov 2001 Posts: 122 | Sixpack, Thanks for the info! | | |
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