Originally Posted by GMC boogie
I installed a 3º bushing and now my readings are:
IO 9º BTDC
IC 39º ABDC
EO 49º BBDC
EC 1º BTDC
I am within 1º of the cam card, I think I will leave it as is.
It's fine like you now have it IMO.
Two keys? Maybe for a blower hub. He's talking about changing the phasing of the cam. Cutting a new keyway does not need to be done for a simple cam timing change.