TOPNEW EN-48383 EN-46105 GM Camshaft Retaining Holding Tools Timing Tool for Vauxhall/Opel/Saab/Cadillac/Buick/Chevrolet/Pontiac by TOPNEW at Daily News Detroit. MPN: TOPNEW1129. Hurry! Limited time offer. Offer valid only while supplies last. The camshafts must be held at TDC to properly set timing, especially once the inner timing chain is set.Both camshafts on each head must be held to time either head in turn. The camshafts on the left head must be held while timing the camshafts on the right head.During this procedure, the left head camshafts are under spring pressure, and can cause the cams to turn, leading to mis-timing the engine.On the left head, EN-48383-1 is installed to hold the cams, and timing is set per published
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