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Old 09-12-2014, 01:18 PM   #1
midunes
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1970 Blazer correct 350 suffix code
I need to know what the correct suffix code is for my early build 1970 4x4 Blazer, 350 w/auto trans, St. Louis plant. I was told it could have been a TAX, TAY, TBC or TMJ. Hope to narrow it down. Thanks
Last edited by midunes; 09-12-2014 at 01:29 PM.
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Old 09-12-2014, 06:44 PM   #2
asolde
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Re: 1970 Blazer correct 350 suffix code
I think this best matches TAY 1970 350 convcab, t350 - 255 4 K-10 to 2500 Here is a good web site http://www.nastyz28.com/chevy-engine...ngs.php#suffix
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Old 09-12-2014, 07:57 PM   #3
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Re: 1970 Blazer correct 350 suffix code
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Originally Posted by asolde View Post
I think this best matches TAY 1970 350 convcab, t350 - 255 4 K-10 to 2500 Here is a good web site http://www.nastyz28.com/chevy-engine...ngs.php#suffix
thanks I'll look at that site right now
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Old 09-12-2014, 08:03 PM   #4
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Re: 1970 Blazer correct 350 suffix code
From nastyz28 site I get this:

TAX 1970 350 convfwd cabs, a/t 255 4 C-10 to 3500

TAY 1970 350 convcab, t350 255 4 K-10 to 2500

TBC 1970 350 convfwd cabs, a/t 255 4 C-10 to 3500

TMJ 1970 350 turhydro 255 4 C-10 to 30
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Old 09-12-2014, 08:08 PM   #5
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Re: 1970 Blazer correct 350 suffix code
Thanks again asole,

TAY 1970 350 convcab, t350 255 4 K-10 to 2500

looks to be the correct engine
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Old 09-12-2014, 08:26 PM   #6
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Re: 1970 Blazer correct 350 suffix code
Can someone with an original 1970 4x4 Blazer confirm?
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Old 09-12-2014, 08:27 PM   #7
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Re: 1970 Blazer correct 350 suffix code
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Originally Posted by midunes View Post
I need to know what the correct suffix code is for my early build 1970 4x4 Blazer, 350 w/auto trans, St. Louis plant. I was told it could have been a TAX, TAY, TBC or TMJ. Hope to narrow it down. Thanks
I don't know if GMC would be the same but my Jimmy is a 1970 from St. Louis. I still have the original engine. It is a TAY as you all have found.

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Old 09-12-2014, 08:35 PM   #8
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Re: 1970 Blazer correct 350 suffix code
Great thanks!! Now for the WTB ad. This site can make life so much easier.
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Old 09-12-2014, 08:47 PM   #9
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Re: 1970 Blazer correct 350 suffix code
Sounds like you might have it. My 71 Blazer was TBG.
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Old 09-12-2014, 08:55 PM   #10
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Re: 1970 Blazer correct 350 suffix code
Well I got the easy part. Now I just need to find the an actual engine with the TAY code.
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Old 09-12-2014, 09:02 PM   #11
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Re: 1970 Blazer correct 350 suffix code
I have a TBC if interested
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Old 09-12-2014, 09:52 PM   #12
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Re: 1970 Blazer correct 350 suffix code
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Originally Posted by 71swb4x4 View Post
Sounds like you might have it. My 71 Blazer was TBG.
My 71 K5 Blazer is also a TBG.
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Old 09-12-2014, 10:10 PM   #13
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Re: 1970 Blazer correct 350 suffix code
You guys may know this but decking the block in a rebuild can/will remove the stamped code so may want to skip that.
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Old 09-12-2014, 10:38 PM   #14
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Re: 1970 Blazer correct 350 suffix code
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Originally Posted by DeadheadNM View Post
You guys may know this but decking the block in a rebuild can/will remove the stamped code so may want to skip that.
Very true. Maybe I should just get the correct cast # and date code then call it good. Or just put the LS376 like this guy has been telling me
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