Cant keep in mind what the B is, but TDC is TOP DEAD CENTRE for for timing. All 20V's, whether or not for the coast or highveld should have a btdc of ten deg. That means your inventory timing ought to be set at ten. It is a guide for https://toyota-4age-engine-for-sa16936.idblogz.com/35116360/top-guidelines-of-toyota-4age-for-sale