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Click on image for the lowdown. 
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| | | Forums66 Topics128,125 Posts1,056,339 Members48,440 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
| | THANKS!
For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | | | Joined: Mar 2006 Posts: 319 Shop Shark | | Shop Shark Joined: Mar 2006 Posts: 319 | If you look under 1970 suffix codes at this site http://no25.chuckthetruck.com/page3.htmlTCK decodes as a 250 used in a Blazer/Jimmy application. You could also put your block number in here http://www.adchevy.com/tools/castinglookup/for further confirmation.
"Nothing astonishes men so much as common sense and plain dealing." - Ralph Waldo Emerson
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