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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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#39698 01/31/2004 2:30 AM | Joined: Feb 2000 Posts: 69 'Bolter | | 'Bolter Joined: Feb 2000 Posts: 69 | My engine block number is 2135412; how can I determine if it is a 248 or a 270 block?
ron | | |
#39699 01/31/2004 2:48 AM | Joined: Oct 2003 Posts: 445 Shop Shark | | Shop Shark Joined: Oct 2003 Posts: 445 | Buy a book on your truck or hope someone can give you the info.I think the manual is your best route in the long run For around $20 it will answer all your ???????'s
dan-pa
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#39700 01/31/2004 3:34 AM | Joined: Jul 2003 Posts: 101 Wrench Fetcher | | Wrench Fetcher Joined: Jul 2003 Posts: 101 | On a GMC, the first 3 numbers on the flat machined surface on the block, just behind the distributor, will be the displacement of 228, 248, 270, and 302 motors. | | |
#39701 01/31/2004 5:32 AM | Joined: Jul 2002 Posts: 385 'Bolter | | 'Bolter Joined: Jul 2002 Posts: 385 | | | |
#39702 01/31/2004 5:36 AM | Joined: Nov 2003 Posts: 53 Member | | Member Joined: Nov 2003 Posts: 53 | I have found the numbers at http://www.inliners.org/casting/numgame.html to be accurate. It shows that block only being used for the 270. I agree the manual is a good inverstment, but I have never found them much good in trying to identify a motor. | | |
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