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Old 02-29-2012, 08:00 PM
dadshogshop dadshogshop is offline
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Originally Posted by chevyman420
does the 010 on the side of the block signify anything i've heard that it means four bolt but i'm not sure

I remember years ago when I worked in a Salvage Yard that the old man at the counter sold 350 4 bolt engines per the 7th bellhousing bolt hole at the top, and the casting number 3970010 meant that it was for sure a 4 bolt, guess what,, I proved him wrong one day on a bet. It can be either 2 or 4 bolt. Even the # 3970010 on the back of the block, does not mean it is 4 bolt. That number was used on both 2 and 4 bolts. This number was to mean it had 10% nickle, As for as the .010 on the side or under the timing cove or where ever it might be, came along at a later date, say "80's, I have always been told it meant a 10% nickel content, hence the cylinders held up better for ware. The only way I would believe it for sure is to see it written down in a GM specs book somewhere... Dad
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