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Discussion Starter #1
I bought this engine this weekend and I am curious of what I've got. Stamped code on the front of the block is TO117CTX. Cast code on the back is 3969854 and another casting number that I found is K11 9. Can anyone tell me what the 3 sets of numbers mean? Thanks,
JR
 

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CTX means it is a 402 big block chevy which Chevy called a 396 anyway. It had 350hp, hydraulic cam , 2 bolt main, cast crank, closed chambered oval port heads, 10.25 compression, a 4-speed was behind it also.
1970 Chevelle is what it came out of from the factory.

[This message has been edited by plain 69 (edited 06-14-99).]
 
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Plain 69, Thanks for your information. Is there anyway I can find out what the K11 9 means?
JR
 

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K 11 9 sounds to me to be a casting date.I would decode it as november 11 1969

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Dean Ciampi
Autumn Gold 1970 LS6 Chevelle
Team Chevelle Gold #52 Aces #3094
 
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Thanks for your reply. The reason that I bought this engine is that the number TO117CTX is the same as the one that came in my car except the original one had a 6 instead of a 7. The cast code of the original one is 3955272 and the one that I bought is 3969854. Why I was so curious about these numbers is that my "Muscle Years Chevelle Information Guide" didn't show the cast code number of the engine that I bought. And the numbers that I got of off the Roadsters Web Page says 402 c.i. 360, 375 h.p. and it also says 454 c.i. 360, 375 h.p. Without carrying it to a machine shop I had no way to know if it was a 402 or 454. Thanks for your info.
JR
 

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Sleepy:

Most of the info above looks good except for a few things. The 3969854 block was a 396 with 350 horsepower, could be had with a 3 or 4 speed manual transmission, and came with open chamber heads. The 3955272 block you are referring to is a '69 396 block.

I'm a little confused by you saying that the engine code for the motor that came in your car was TO117CTX, and was just one number off, meaning that your car originally had a '70 block. Then you say that your original block was stamped 3955272, which is a '69 block. What year is your car?

A good way to check for a 454 is to look for the huge reliefs in the block providing crankshaft clearance. It could also be a late '69 427 block (it also had reliefs due to the anticipation of the LS-6 the next year), but if there is a rotating assembly, check the crank and see if there are any counterweights. The 454 was externally balanced, while the 427 and 396 were internally balanced. You can also look for weights on the dampner or flywheel/flexplate.

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Rob Clary
'70 LS-6 Chevelle
Team Chevelle Gold Member #85
Interested in COPOs, Yenkos or other dealer built muscle cars then go here:
ortrackm.missouri.org/~yenko

[This message has been edited by Chevy454 (edited 06-17-99).]
 
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