ok....i had to replace the old head on my 97 neon highline dohc.....the old head came with cam p/n 917....the new head came with cam p/n 8AA.....with the timing marks dead on, i have no compression....i followed all the procedures exactly when installing the head and new gasket. Are these cams compatable?...i am at my wits end with this motor.Been working on cars for 40 yrs and never had such a problem b4.