I have another post on here from when I first put it together. Now its running but iffy I'm lacking in power & it shifts really hard. Sometimes ittl let me go past 3000 but most of the times it just chugs as if it has a rev limiter set at 3k. The hard shifting is usualy from second into third . or vice versa. Im running the y8 head with y8 cam and gear and belt. Am I supposed to use the y8 timing belt or should I use the z6 tbelt.