Value of 428cj vs 427

[cobranc]

I recently purchased a 65 cobra replica with what I thought was a 427. After educating myself(does not have cross bolted mains bearing caps) I had some doubts so I pulled the oil pan. The crankshaft has a casting number of 1U and the block has reinforced main bearing webbing. This leads me to believe the engine is a 428CJ. I bore scoped the top of the pistons and have found that they are .030 over pistons.
Other info on engine: date code on engine is oct 15, 1968. No engne Casting number, push in freeze plugs, aftermarket cam(no idea of specs but sounds nice), forged pistons. That is all I know so far.

My question is: which engine is more valuable 427 or 428CJ?

Thanks for the help.

[mrmustang]

Originally Posted by cobranc

My question is: which engine is more valuable 427 or 428CJ?

Thanks for the help.

Difficult to say given the lack of anything to compare it to. Missing casting numbers means you did not look in the right place.


Bill S.

[cycleguy55]

This may help in the determination of what you have: Cylinder Block | Mustang 428 Cobra Jet Registry