Well I ordered arp rod bolts for a b18b build I was gonna do, and ended up with a JDM b20b longblock and it's installed already, then my ARP rod bolts came in. So I want to now put them in the B20b since itll be boosted or vtec head will be installed not sure yet. Anyway I want them in there. Can they be installed without removing the head? Can I remove rods and pistons from underneath the car? Can the pistons be installed from the bottom? Cause the have to be pressed in so I gotta take them to the machine shop. Can this? Or has this been done? I'm trying to minimize down time and dont wanna buy a new head gasket and get the head and block machined for a flat surface.

 

No, you have to remove the head. The rods will also have to be resized after the studs are installed.