Thanks,our class lets us do pretty much anything bar remove the airbox.The main things i was worried about was losing comp or changing the timing via higher or lower porting.So i will keep the cylinders which are stamped A.But they gave me unmarked pistons so wrong pistons if the chart on tyga is right.I'am off now to change the pistons.Once i'am done i will post my dynos and update you guys on the racing[though its now heading into winter over here it wont get cold but it will rain alot].Thanks Bruno.