I had my Zc built, the zc uses d16a1 rods, Crower part #cr-b93726b, je makes custom pistons, i had a set made at 9.5.1 ratio, i think je has a off the shelf 9.1 pistons(srp) all the internal parts are the same as the 88-89 integra, as for headstuds, if you go with arp, dont buy the vw headstuds...