320 bhp was from my old cossie i had doo,s old rst i rebuilt it with accrilite pistons +.5 oversize fully lightened and balanced made 223bhp before rebuild was running 16psi when i had it but sold it before i got it set up you got front mount cooler as well would also suggest cossie managmet,my mate has a s1 with a 2.1 zvh running accrilite pistons standard bottom end stage 3 head and cam cossie managment with green injectors and front mount cooler 250bhp
