Hi there i was wondering if anyone out there knows about altering timing to suit a chip on an old 20xe engine? basically i have timed the engine back to factory setting after relacing the valve lifters and seem to have lost power i have read somewhere that older engines are timed slightly out to suit the chip? my question is on which cam (or maybe both) do i alter slightly? please get back to me if anyone knows what i am going on about .....cheers adam