i understand that i will be limiting its power, head is being built by a head shop, all shims are being taken care of by them, i just bought all the parts and did the porting myself, its gonna be a dedicated track car and towed to all events, and when the bottom end gives way, then i will build a fkn tough bottom end, i know that the powerband will be very high in the rev range, but until i have a tough bottom end, i wont be using 100% of the power