The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - can someone decode another small block for me please?

*1972C10* · 11-19-2004, 12:40 AM

You cant really go by casting numbers on the main bolt count Ive had a 3970014 4 bolt block and still have a few 3970010 2 bolts Both are numbers many people swear to be 2 bolt and 4 bolt 010 being the four bolt.

11-19-2004, 12:40 AM	#8
1972C10 Account Suspended Join Date: Dec 2003 Location: Texas Posts: 2,686	You cant really go by casting numbers on the main bolt count Ive had a 3970014 4 bolt block and still have a few 3970010 2 bolts Both are numbers many people swear to be 2 bolt and 4 bolt 010 being the four bolt.