I've heard alot of opinions on how much timing to pull off. Seems like .7deg per psi is a common amount, i've heard that you can run stock timing up to 5psi then take off .7 per additional psi (7psi=-1.4) is this correct? I heard BTM has the option of starting the retarding @ up to 5psi but I see no way to do this WTF?

 

msd6btm does not have the 0-5psi timing starter option only the btm timing master has this option

 

it is the timing master