Date codes are the letter, 1 or 2 digits for the day, and 1 digit for the year such as J 25 7 would be October 25, 1967. One exception seems to be the 1970 engine blocks being dated as month letter, 1- or 2-digit date, and a 2-letter year number (70). This Casting number is usually found at the rear of the block on the left or drivers side on top of the bellhousing flange. The Engine Block Casting code is one of the best ways to identify a Chevy engine block. General Motors alloys all of its cast iron blocks with a certain amount of nickel, but for some time, cast them with a far higher nickel content than it does today. Model: PN 31121212 (0.391-inch raised cam and 0.800-inch spread pan rail versus stock 350 Chevy: Block Composition: Class ⦠Ok you have a 3970010 block, now look at the date code on the back of the block. quite a bit of 70 parts in it. Small Block Chevy Engine Block Identification General Engine Block Specifications While 6 different bore size blocks have been produced, the small block engine can be classified into 3 bore sizes and 3 main bearing sizes. LS Small Block. However, it can come in either a 2 or 4 bolt main configuration. Also forgot to mention this block was used for both 327 and 350 cubic in. From this chart - I think you may be misreading the number - 3970010 is possibly the actual number: Which makes the engine pretty old 68-72 350 V8 - 4 bolt main. 12550592 LS Small Block V8 1997-up 346, LS1. Became a 350 for 68 up in most Chev. Need car detail. 68-70 it could be a 302, 327, or 350. 283 blocks (3.875" bore, 2.3" main), 302/327/350 blocks (4" bore, 2.3" or 2.45" mains), and 400 blocks (4.126", 2.65" mains). Drawing of an LS6 Small-Block Chevrolet engine. Next look at the heads and crank, check the casting numbers and dates on the heads. Gm casting number 3970010, 350 4 bolt mail block. The most common 350 was the 3970010 block. I'm not 100% sure, but I think I recall seeing some 882's with the 1.72/1.50" valves in the past. The 302 block had additional stamping that read DZ, most likely it is not a DZ block. For most engines like the 350, the same block was used for 2 and 4 bolt main. Re: Engine Casting Block #3970010 02-14-06 07:02 PM - Post# 874001 In response to joeysworld Hiya Joey If I'm not mistaken, this head could either have 1.72/1.50" valves, or 1.94/1.60" valves, depending on what engine they originally came on. have a 69 built on 12-19-69. one of the last 700. has a 3970010 cast 350. is it a casualty of the strike. It was used from 1969 through 1980. Block usually will have the 10/20 tin nickel content. 12560621 LS Small Block V8 1998-up 346, LS1. - Answered by a verified Chevy Mechanic. We use cookies to give you the best possible experience on our website. Alan Barnett Sep 17, 2016 At 3:18 pm motors. So the casting # info will say "2 or 4 bolt". 12559846 LS Small Block V8 1998-up 346, LS1. I included past this number so that you can see that the number you posted doesn't actually exist. SBC # 3970010 is this a good block? If the date code is anything higher than 71 it is a 350. Chevrolet has produced the small block engine in dozens of different configurations since it was first introduced in the mid-1950s. And thus my conclusion that the 9 is most likely a 0. Hope this helps. Made in 2, or 4 bolt, used in cars, trucks, vans, 1bbl, 2bbl and 4bbl carbs 3970010 Small Block V8 1969 302, 4 bolt, Camaro Z28 . Generally the 010 blocks are good for making perfornance engines. By continuing to use this site you consent to the use of cookies on your device as described in our cookie policy unless you have disabled them. Yes and no. lines.
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