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There is three engines with the suffix code TBM. TBM - 1970, 307, Conv, Van, C10, 1500 TBM - 1979, 350, Conv, Van, C-20, 3500, Phoenix TBM - 1982, 305, Conv, Van, C-10, 2500 To find out which engine it is you need the block casting date. The small block casting date is located on driver side rear of block on flange forward of bellhousing. Casting Date Example: E038 - (E = Month, 03 = Day, 8 = Last digit of model year (1978)). The letters A-L stand for months Jan - Dec.
 

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it could be a 350, 327,305


vin # ko126tbm :sweat:
c97155985
Your title lists the casting number as 3970010, if this is indeed an 010 casting it is the highly desireable heavy duty 4 inch bore block that was used for some 302's and 327's and a ton of 350's. It was used as a basis for high performance passenger car engines as well as heavy duty trucks and industrial engines. It is found as 2 or 4 bolt mains, the only way to know is to pull the pan. 2 bolts are good and 4 bolts gooder. If a two bolt this block easily converts to 4 if that much strength is needed. It is of course a 2 piece rear seal and has no factory provisions for a roller cam.

The factory id stamping ending in TBM leads you to this being from a large van with a 350. The fact that the id stamp is legable probably means no one's tried to rebuild the thing a good thing for the hotrodder as many rebuild jobs only serve to screw an otherwise decent block up. figure coming out of a van, what you've got a darn good bottom end to build on that will need a decent set of pistons, heads, cam, intake, etc. to build a strong running hot rod motor.

Bogie
 

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It is said by some that the 010 blocks machine better.I'm not sure if that is more myth than fact.You would think if that was the case the boring bar would labor more and it doesn't.
 
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