Thread: Pleas help me decode engine

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I am Trying to figure out what my 327 engine is from Here is the information I Have The Casting number on the rear driver side is 3970024. The Numbers on the front plate are T1222000 and 11B128786. From what I have gathered this is telling me it was made in Tonawanda December 22nd But from there I am Lost. If anyone can help I would really like to know what Year Make and Model Vehicle this engine came out of. Any Help would be greatly appreciated. Also new to the forum and the engine is currently in a 1983 C10 Stepside that I am fixing up.

I think you're off by 20 c.i. 3970024 is a 69-73 2-bolt main 307 c.i.d car & truck 2-bolt motor.

Check THIS LINK

Yep, 283 block (3.875" bore) with 327 crank (3.25" stroke) and rated from 130 to 200 hp, depending on the build...... "OOO" does not show up anywhere that I can find. Are you sure about the letters? I also thought it might be DDD, but there is no such letter series used.

11B128786 is a partial VIN of the car or truck which the motor was originally installed in at the factory, sometime between 1979 and 1983. It could be the original motor for your C10. Check the VIN plate.

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Yes sorry I am aware that it is a 307 not 327 that was a typo. It is not the original engine to the truck it was a 4.1 straight six originally I have the owners manual with the Vin correct information it was a 3spd on column and is now a 4 on the floor. I am 100% sure of the numbers and that's why im so confused the 000 doesn't match any suffix codes I have found. Maybe a crate engine but then why the vin stamp?

Update: I believe the engine tag may actually say T1222ccc meaning it would be a 1971 which also corresponds with the partial Vin. Does anyone know what model this may be out of

CCC would be a 1971 307 with a powerglide

Could have been an A(Chevelle, Pontiac or Olds mid-size), F(Camero or Firebird), or X(C/K Trucks) or a Monte - so it could have come from virtually any 1971 GM model car.

That's what I was leaning towards but the other piece of info that I have is that it is paired to a four speed Borg Warner aluminum cased transmission which supposedly came from the same vehicle

Key word, SUPPOSEDLY. Unless you have owned it since it left the assembly line, you have no idea how many different transmissions it has had behind it. Glenn is correct, it began life as a 200 hp 307 with a 2-bbl, bolted to a 'glide.

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Ok thank you all very much I'm hoping in seeing the CCC sufix correctly, it doesn't make any difference just curiosity. I think I'm just going to run the snot out of it while I build a 350 for it

The 307 should be a good candidate for a turbo. 5-6 psi will increase power 40%.

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Do you know of any reasonably priced set ups or would it all be custom, is there turbo maps out there for the 307? How would you adjust the fuel? And would you have to change engine internals and how the heck do you get a turbo manifold for a v8

Cheap Turbos From eBay On A 350 Small Block Engine - Car Craft Magazine

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