ok so im building a d16 with high compression i have everything done motor in and all when i started it cylinder 3 and 4 start smoking like crazy. when the header was off there was oil drippin from the exuast port. i dont think its the piston rings cause there brand new. but i did change the valve seals and reseat the valves so i was wondering if the valve seals could pop off and if this could be my problem.