[93lxmustang]

On the 87-93 2.3 mustang engines. Are the blocks and internals the same except the cyl head?

[b_chandler]

No. Around '89, the main journal size decreased. The rods are the same and still carry a D4 (1974) casting number. I want to say there's a difference in the oil pump or the pickup and that may be due to the later use of an aluminum pan.

[b_chandler]

EDIT: I forgot to add that they also changed the shape of the front seal retainer in '89 to allow room for the crank sensor.