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| | | Forums66 Topics128,087 Posts1,056,112 Members48,434 | | 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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| | | | Joined: Dec 2001 Posts: 14,522 Moderator: Welcome Centre, Southern Bolters, Legion Hall | | Moderator: Welcome Centre, Southern Bolters, Legion Hall Joined: Dec 2001 Posts: 14,522 | Mortec.com isn't currently working and I haven't found another place to check yet.
Engine # is gone but the CASTING is 3970010
Thanks | | | | | Joined: Dec 2003 Posts: 2,733 Shop Shark | | Shop Shark Joined: Dec 2003 Posts: 2,733 | That block was used as both a 302 in 69' Z-28 Camaro and 69-80' as a 350 with both 2 and bolt mains according to Mortec. | | | | | Joined: Nov 2005 Posts: 6,100 'Bolter | | 'Bolter Joined: Nov 2005 Posts: 6,100 | Hy Achipmunk, that block was used for any 4" bore application 302, 327, and 350, it is a post 1968 block [large crankshaft bearings], and I've seen them in both two bolt, and four bolt main configuration. I don't know when they stopped using the number, but 1985 would be the newest [1986 was the first year for the one piece rear main seal I believe], hope that helps some. | | | | | Joined: Dec 2001 Posts: 14,522 Moderator: Welcome Centre, Southern Bolters, Legion Hall | | Moderator: Welcome Centre, Southern Bolters, Legion Hall Joined: Dec 2001 Posts: 14,522 | Thank you Dave and 3B. Its what I needed to know. | | | | | Joined: Mar 2005 Posts: 98 'Bolter | | 'Bolter Joined: Mar 2005 Posts: 98 | 69 to 79. 80 they changed dipstick side and 86 to 1 piece rear seal
50 chevy 3100
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