I have searched around checking casting codes to try nd date my block (nastyZ28 and other internet sources). The engine ID code is K 09 07 TKB which is st. catherines sept. 7th 1976 or 79 4 bolt. The thing is I'm pretty sure that I've got a 2 bolt lol. So I tried to search what I thought was the engine vin code (also on the deck pad with id code) but no results my code does not match the format on any casting site. The # is T71503981. Also I've noticed a few single letters and numbers around the block, but no traditional casting date code like E038.Any help would be appreciated.
My understanding is that none of the casting or suffix codes will determine if a block is 2 or 4 bolt main...That is determined after all that is done in the plants
The question isn't whether is a two or four bolt, i have a 2. I thought that my casting was supposed to be a 4 bolt then Carl pointed out that it was BBL for the carb. I"m now just trying to narrow the date down if possible.
-- Edited by scott420p on Friday 11th of January 2013 04:10:22 PM
3970014 350 69-77 Pass,Chevelle,Camaro, Nova,Monte Carlo 2 or 4 bolt main 3970014 350 69-79 Truck 2 or 4 bolt main 3970014 350 72 Corvette late '72,200 HP,255 HP 4 bolt main
I understand wanting to know the year of the casting for emission compliance reasons but I wouldn't sweat the 2 bolt/4 bolt deal if it for a street driver. I ran a 2 bolt 350 in a tubbed Nova for years and beat the hell out of it ... broke some tranmissions (Super T10's) but never had an issue with it being a 2 bolt. Just my opinion.
I have also read somewhere that converting a 2 bolt block to a 4 bolt block ends up being stronger than a factory 4 bolt block.
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Agree with Dave M,a 1973 casting. Chevy by the Numbers says that this is a Tonawanda casting and in 1972 5 plants cast blocks. Flint plant does not show casting this block. All Tonawanda castings have full last 2 digits of year cast(73) and this has D 17 73 as opposed to D 17 3 (Apr 17th 73).This block was used from '70 to '73. I am gonna go out on a limb and say that this 3970014 was cast in Tonawanda then shipped to St Catherines(K) machined and stamped T71503981 then installed in a truck (TXB) so I will say 4 bolt main.Pull the pan off!
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The block that I have is an 010 casting and is 2 bolt. I'll have to look a little harder for a date casting. Its out of my truck on a stand so looking around on the block is not a problem.
It's a truck McKinnon casting from St Cath.Ont.Look for a casting date on the block sides or the bellhousing area.
