What's new
CK5
Register an account today to become a member! Once signed in, you'll be able to participate on this site by adding your own topics and posts, as well as connect with other members.

Trying to ID Small Block

J

jfortner

Registered Member
Joined
May 12, 2004
Posts
43
Reaction score
0
Location
Everett, WA
I am trying to ID the small block in my Blazer. The ID code that is stamped into it is V0121U7. I can't find any documentation for the U7.

The heads cross as a 68-73 350, 75cc chamber heads. The intake crosses as a 74-76 350 QJet car intake.

The engine is in a '71 blazer and the owner said it was orginal and never had any work /forums/images/graemlins/thinking.gif based on the mismatched bolts and the RTV on some of the gaskets I know it has had work... So I am not sure if this is the orginal engine or not?

Thanks John
 
is that the number off the back of the motor on i think is on the drivers side right were the bell housing bolts onto. thats the engin id # /forums/images/graemlins/deal.gif
the one you posted kind off looks looks the number from the front of the block /forums/images/graemlins/dunno.gif
 
Yes, the number is off of the front. I usually cross reference this number because it tells you how the engine was orginanlly built. Compression, carb, HP, etc. I just can't find the U7 in any of my reference manuals. The number at the back of the block just isn't accessable with the engine in no matter what I try and do to get at it.

John
 
I've had several 1971 chevy truck motors,the number on the front of the block should have a 3 letter code after the VIN#,like TDR,TDH,TDP,those are 3 of the block codes I had on mine.The BIG casting # in back will only tell the displacement,and not specific horsepower and tranny listings,as you probably already know--if you find a code that begins with a "T" post it here--I can look it up in the original GM parts counter book I have that covers 47-72 series 10-30 trucks.Maybe the # for the heads will help narrow it down some,but they could have come of anything.
 
It is a fairly clear stamping and I am certian it is only two letters U7. They did use some numbers in the code for a few blocks. This is one of the better references I have found on-line http://www.nastyz28.com/spmenu.html

Since I wasn't able to find U7 in any of my books or online I didn't know if it could be a crate block /forums/images/graemlins/dunno.gif

Does anyone else with a 1971 have a U7 as the last two digits stamped into the pad on the front of the engine passengers side?
 
I havent seen a code that ends with a number either(yet!)--but looking at the list of codes on that site you listed,it might be UJ--that would be a 69 307,from a K series truck--maybe someone swapped an older motor in!?.
 
Thanks for the help, I pulled the intake and found the block ID. It places it as a 1969 307. Not what the previous owner claimed but with as bad as it smokes it needs replaced anyways. Will get me by for now.
 
You must log in or register to reply here.

Latest Posts

Top Bottom