I recently bought a motor for a guy who said that it was a 350 but i wasnt sure. I cant not determine what engine it is. The casting number is 3970010 which could be a 302, 327, or 350. The two numbers on the front of the motor are V0915TTXD and C6J108608. Any help is great,

 

Search the suffix probably a 350 1975

 

So would I go with txd or just xd

 

TXD

 

Those "codes" only tell what motor the BLOCK came from. They don't tell you A DAMN THING about what the MOTOR that the BLOCK is now part of, is.

You can take the BLOCK from a 74 Impala 2-bbl with 165 HP, put a big solid roller cam and Brodix heads with Stahl header ports on it and fit it with high-compression pistons, and get 650 HP or whatever out of it; and yet, the BLOCK (those "codes") will STILL say "165 HP" if you can look them up. Similarly, you can take a BLOCK with "codes" for a "LT-1" out of a 70½ "Z/28", and put dished rebuilder garbage pistons, a 929 copy, and 624 heads on it, and get ... you guessed it ... a 165 HP wonder, and yet the "codes" will STILL say 375 HP or whatever it was.

Since VIRTUALLY NO rebuilt MOTOR is ever rebuilt to be identical to whatever "codes" are on the BLOCK, it is VIRTUALLY 100% GUARANTEED that whatever the MOTOR now is, is NOT the same as the "codes" on the BLOCK.

In short, the "codes" are USELESS and tell you NOTHING WHATSOEVER of any value beyond MAYBE (if you can look them up) that it WAS whichever possible displacement when it left the factory. Doesn't even mean that it's still that displacement let alone that same MOTOR. And if the BLOCK is just a BARE BLOCK and not a MOTOR at all, they mean even less (if you can get to something with less meaning than nothing). A complete total and utter waste of time and effort, and a futility.

If you really want to know what the MOTOR you bought is, get the piston part #s, measure the deck clearance, get the head casting #s and all the machine work done to them, and get the cam part #. Those things will let you approximate what your new MOTOR is. The "codes" on the BLOCK will do NONE of that.

 

I was just trying to see what the block was to know which direction to go with the motor.

 

It's a BLOCK. There's no "information" to be had from the stampings on it.

3970010 is probably the single most common block casting there is. It was cast from about 69 to about 80. Used in EVERY POSSIBLE configuration of 4" bore motor (302, 327, 350). But now, it's a BLOCK. You can build it into whatever you want, subject to the degree to which it suffers from The Problems that result from non-existent quality control during the time of its production. I'm tired of typing what those are, so here's a post I already typed that lists a few of the m ore common ones.

https://www.thirdgen.org/forums/carb...vert-carb.html see post #2. (first reply)

Read, absorb, and feel free to ask questions.

 

I'd guess a truck block. TXD would be a 75 350 four barrel carb in a van. Good starting point I'd think.

 

No different from any other BLOCK. 3970010 in a truck, van, Vette, Impala, Checker cab, or WHATEVER, is 3970010. Period paragraph end.

Freedom from quality-control issues is more important than what sheet metal the BLOCK was wrapped in originally. Problem is, they're HARD to "check" for. And of course "codes" don't tell you ANY of that.