4 Bolt Main Blocks - The 1947 - Present Chevrolet & GMC Truck Message Board Network

chewed 71'er · 11-09-2002, 04:22 PM

Were there many 4 bolt main 350 blocks in production in these trucks? Is there a code stamped on the block? Just wondering if 4 bolt mains are common or hard to come by.

*Fast68Chevy* · 11-09-2002, 05:04 PM

very common, most common casting found in these trucks was 3970010, most any if not all 350's installed in trucks were 4 bolt through 79 model year, 3970014 was another mass produced extremely common 4 bolt block, cars version usually were only 2 bolt mains with same casting

11-09-2002, 04:22 PM	#1
chewed 71'er Registered User Join Date: Mar 2002 Location: KC, NW Missouri Posts: 144	4 Bolt Main Blocks Were there many 4 bolt main 350 blocks in production in these trucks? Is there a code stamped on the block? Just wondering if 4 bolt mains are common or hard to come by.

11-09-2002, 05:04 PM	#2
Fast68Chevy Account Suspended Join Date: May 2000 Location: IL Posts: 0	very common, most common casting found in these trucks was 3970010, most any if not all 350's installed in trucks were 4 bolt through 79 model year, 3970014 was another mass produced extremely common 4 bolt block, cars version usually were only 2 bolt mains with same casting



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