225 question

Just a quick question, did Jeep cast the 225 blocks or did GM?

 

Then I guess it is possible I have a GM block after they got the rights back. It has GM cast into the block. I know, I guess I know it's an odd-fire, rods share the same crank journal. I know it doesn't matter but would just like to know. Also the heads have plugs in the exhaust ports (i.e. smog stuff possibly) so that might date it later in the GM run, or do all 225 heads have those plugs.

 

Jeep itself probably never cast the motor, they owned the tooling , thats true but they were probably cast from an outside foundry and the blocks were then sent to back to jeep for the machining and assembly. All 225 v6 motos have the GM logo and part numbers cast into them. The later ones say from 68/69 thru the 71 models had the prvisions for the smog pump and such even if they didn't have the pump on them. The auto industry has not cast its own blocks and such for alot of years now, they were designed and then the casting was outsourced. There were no 225 blocks except marine and industrial use made for any GM cars when they bought the tooling back. So if you have a 225 block it is either an original from 63-71 or a marine or industrial use made before 1975.