I am french, excuse me for my aproximatif English
The engine and on my corvette of 1973. I search the origin, can you help me?

small block 350ci 15R525848 T0122CMJ

Thank you

 

The block number behind the drivers side head will tell you if it’s a 305 or 350.



http://www.nastyz28.com/chevy-engine-code-stampings.php

 

The engine is a 350ci equippedwith a carburettor 625 carter

 

How do you know it's a 350? It looks identical to a 305 when looking at it like that.

Normally the suffix code can tell what block it is however your CMJ can be a 305 or a 350.

In 1980, it was a 305. In 1974, it was a 350 police special rated at 160hp. In 1975 it was a federal rated 145hp.

You're going to need to get a casting number off the block to better pinpoint it's origin. What it originally was doesn't mean a whole lot.

15R525848 = Last part of VIN from original vehicle.
T0122 = Tonawanda engine plant January 22.