C3 Tech/Performance V8 Technical Info, Internal Engine, External Engine, Basic Tech and Maintenance for the C3 Corvette
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Engine I.D.

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Old Dec 27, 2014 | 09:16 PM
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Default Engine I.D.

Purchased a 1976*corvette*stingray*about a year ago. Try to save the waves....love these body styles. Beginning to rebuild engine with some possible mods, tried to identify the engine before tearing it out and wanted to find out what the engine actually was. I tried researching the identification number I recorded off the block and that number is 12B503867 T0816CTK. It doesn't match anything I've found as to finding out what engine I actually have in my car. Can anyone help?!?!*
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Old Dec 27, 2014 | 09:31 PM
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CTK was used for 1970 370 hp 350, 1972 130 hp 307, 1974 180 hp 400, and 1978 145 hp 305. If you can locate and decode the block casting date, it should give you some idea what you have.

Last edited by drwet; Dec 27, 2014 at 09:35 PM.
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Old Dec 27, 2014 | 09:34 PM
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Originally Posted by trickyray1976
Purchased a 1976*corvette*stingray*about a year ago. Try to save the waves....love these body styles. Beginning to rebuild engine with some possible mods, tried to identify the engine before tearing it out and wanted to find out what the engine actually was. I tried researching the identification number I recorded off the block and that number is 12B503867 T0816CTK. It doesn't match anything I've found as to finding out what engine I actually have in my car. Can anyone help?!?!*
I'm not 100% sure, but CTK shows to be a 1970 370hp 350ci in my black book. The other numbers I can't help you with, sorry.
Larry
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Old Dec 27, 2014 | 09:43 PM
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The 2 in the VIN 12B503867 identifies the year of the car as 1972. The only engine that used the CTK code in that year was 307cu.in/130HP 2bbl. w/auto trans which installed in Chevelle or Nova.
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Old Dec 28, 2014 | 09:14 AM
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thanks for the info. will try to locate block date. don't know why this to816cty don't match 12b503867 stamped right next to it. anyway this engine has 3986388 heads paper weight but with 3972110 highrise and holly on top jigsaw puzzle with some pieces missing.
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Old Dec 28, 2014 | 09:29 AM
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thanks, looking for the block date to match the year. it has paper weight heads 3986388 low comp. but has 3972110 highrise and780 holly.this don't add up.
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Old Dec 28, 2014 | 09:41 AM
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looking for block date to match 70,71 or 72.this engine maybe a hybred .3986388 heads,low comp.,3972110 high rise 780 holly don't know block yet but it has the horn shaped exhaust thanks for the info
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Old Dec 28, 2014 | 11:37 AM
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I wouldn't spend much more time trying to decode anything. The numbers will only indicate how the engine was originally built, not what some previous owner(s) did to it over the past 40 years.

I also wouldn't spend money trying to modify it for more power.
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Old Dec 28, 2014 | 12:06 PM
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thanks for the info, was hoping this was original. the rest of the car is in good shape had good storage. done chasing numbers. time to plane on a nice 350.
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