... for a 55-58 Pontiac V8 or 55-59 GMC V8 they could part with? Part number is 518965. It is group # 0.004 in the Pontiac Master Parts Catalog and group # 8.0250 in the GMC Master Parts Book. This is the U shaped metal piece that bolts to the bottom of the timing cover and the top of the front motor mount. Mine cracked about two inches below the timing cover bolt on the passenger's side years ago. I had it welded. I was under my truck last night and noticed it has cracked again about a half inch from the weld.
