I think doesn't work right is an understatement.... this may work if the engine is brand new but most certainly not with a well worn one... The stock head won't seal correctly no matter which way I place it... I was working on this with my racing friend and between us we have 30 years of nitro experience...
Basiclly, I wasted about $40us on parts which is no big deal.... I will take poor judgements advice and go with O.S.... ordering tonight and can't wait for the delivery....