Put a y8 head on my y7. I couldnt get the ignition timing right after the crank and cam were set to TDC. After doing some more research i realized that the y8 head has a z6 cam sprocket. I dont know if its a z6 cam or just a y8 cam with z6 sprocket, But i realized that this is why I cant get it in timing because the roughly 4.5 degree difference between the sprockets. I do know that the y7 and y8s use the same cam sprocket. So if I put my y7 sprocket on the cam would this fix my problem?

 

Add y7 cam gear, reset timing. Check to see if it is correct, thats prety much the only way to know for sure.