That number is I believe off the timing cover SBC, If you look at the back of the engine where the trans bolts to the block there should be a casting number on top, Get me that number and will be able to tell you what you have there. Hope this helps, Good Luck Randy.
I’m happy to assist further over the phone at https://www.6ya.com/expert/randall_d932ef6e01588b0f
You can goto this web site and it will help you.
http://service.gm.com/dealerworld/vincards/
Yes Chevy and GM are the same. You can also look for a sticker on the front of the truck next to the radator area and under the hood. Now if you think that the motor was changed you'll have to look at the ser. number on the motor block itsself. it is on the back of the block on the top of it. You can get it and call AutoZone with it and they can tell you the size or call a Chevy or GM dealer. You can also call the parts dept at the dealer and give them the VIN number and they can tell you what size it is. This cost nothing to do.....
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