Cant recall what the B is, but TDC is Best Useless CENTRE for for timing. All 20V's, no matter if for the Coastline or highveld ought to have a btdc of ten deg. That means your stock timing need to be established at 10. 4a. I would state that it https://eduardomnnki.activoblog.com/38087263/an-unbiased-view-of-4a-ge-engine-for-sale