Cant bear in mind what the B is, but TDC is Leading DEAD CENTRE for for timing. All 20V's, no matter if with the coast or highveld must have a btdc of 10 deg. Meaning your inventory timing really should be set at 10. i'm right here in cape city, https://chandrao371kin8.blogaritma.com/32867825/about-4age-blacktop-for-sale