Our lower the same as the fox?

A long block from 87-93 is the same as the 94-95 and will work with all of the 94-95 specific hardware. The rotating assembly is the same unless the one you plan to use was upgraded to forged internals later.

I've heard that some of the late 80s blocks have a higher nickle content and that they were slightly stronger but have not experienced this first hand.
 
I think he means lower intake JJ95GTID. The 94/95 upper should bolt up to the lower on a fox. The only difference I can think of is the foxes lower is drilled and tapped for the ACT sensor. Just leave the old one in the lower to plug the hole.
 
86 had flat top pistons

87-92 had forged pistons with valve reliefs

93-95's had hyper pistons.

Really if its just to get get forged pistons I wouldnt do it. Hypers can handle a good bit of power from n2o and boost if tuned correctly. Even a good forged piston will fail from det./ping.
 
lower intake is the same more or less. My 94 actually had a left over 93 fox intake (mine is an early 94 model...IIRC its build stickers were around aug. 93). There is a plug that is/was installed since the air intake sensor was moved to the intake tubeing and removed from the lower.

The lower will bolt up otherwise directly.