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Old 04-07-2005, 12:44 AM   #1
Bstang
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Engine numbers decoded

Truck is a 1970 GMC 1/2 ton, engine is a 350, numbers on engine are as follows. Back of engine left side, top GM 3970010 M (in square), 6.
Right side, clock @ 2, 9K9 A Q
D N
Block front right side top, K10 21 TBB
Block right side clock @ 12
Thx
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Old 04-07-2005, 12:51 AM   #2
skokie
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From mortec.com
3970010....302.....69....4...Z-28 Camaro
3970010....327.....69....2...Trucks and industrial
3970010....350...69-80...2 or 4

Busy block
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68 build thread
http://67-72chevytrucks.com/vboard/s...d.php?t=223234
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Old 04-07-2005, 01:39 AM   #3
Truckstuff
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K10 21 TBB

K = McKinnon Casting Foundry
10 = October
21 = Day
TBB = 1970, 350, 255Hp, 9.0:1 Comp. Ratio, 4bbl, 3-spd, C10 to 3500.
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Last edited by Truckstuff; 04-07-2005 at 01:42 AM.
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