My buddy is changing his head gasket on his 93 Integra. He was told Type-R pistons were in it, but they look like stock LS ones to me. Just to be sure I thought I would ask. They're flat top pistons with four valve reliefs cut into each one and are marked PR4 J. Stock LS right?

 

i do believe so

 

yup, pr4 is oem ls.

 

Ok, that's what I thought. Thanx. By the way, a Type R piston is domed right?