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*YoungPup1977* · 03-06-2018, 10:18 AM

Casting number and casting date will help like I said in my previous post...you can google the TDR letters and you might get something like 1980 350 c10.......Thanks.

Also, you can look at the VIN tag inside the driver's door....it should indicate which MONTH/YEAR the truck was assembled..... upper right corner of door VIN tag some show something like 2 / 72 (example)......which would be february 1972
Take a look at the rear differential and check the casting date.....with all these "dates" ....see how close they are to each other...

So far I see the engine has a may 12th date....the casting date on the block must be "before" May 12th...
Is the casting number of the engine 3970010 ? I do not see a TDR suffix in 1972....

03-06-2018, 10:18 AM	#6
YoungPup1977 Account Suspended Join Date: Jun 2015 Location: No longer here Posts: 1,000	Re: 72 blazer motor casting number Casting number and casting date will help like I said in my previous post...you can google the TDR letters and you might get something like 1980 350 c10.......Thanks. Also, you can look at the VIN tag inside the driver's door....it should indicate which MONTH/YEAR the truck was assembled..... upper right corner of door VIN tag some show something like 2 / 72 (example)......which would be february 1972 Take a look at the rear differential and check the casting date.....with all these "dates" ....see how close they are to each other... So far I see the engine has a may 12th date....the casting date on the block must be "before" May 12th... Is the casting number of the engine 3970010 ? I do not see a TDR suffix in 1972.... Last edited by YoungPup1977; 03-06-2018 at 11:16 PM.