EN-48383В is for 2007-Current.В Use EN-461 and older. Buy En 48383 Car Camshaft Retaining Tools Set Replace En-48383 En-46105 Compatible with Alternative, Vauxhall, Saab, Cadillac, Buick, Chevro-let, Pontiac. Failure to use EN-48383 can result in incorrect timing, leading to engine damage. Both EN-48383-1 and EN-48383-2 are slotted to allow them to be installed over the SIDI drive portion of the camshaft in future applications. When the engine is at the second timing position to set the right head chain, EN-48383-2 is installed to hold the left head cams, and EN-48383-3 is installed on the right head cams. On the left head, EN-48383-1 is installed to hold the cams, and timing is set per published service information. 6L vin 7, 2004-2006 Buick Rendezvous 3, 2007-2011 Cadillac CTS, SRX and STS, GMC Acadia, Buick Lacrosse,Camshaft Retaining Tool Set - EN-48383. During this procedure, the left head camshafts are under spring pressure, and can cause the cams to turn, leading to mis-timing the engine. The camshafts on the left head must be held while timing the camshafts on the right head. Both camshafts on each head must be held to time either head in turn. Buy Camshaft Retaining Tool Kits Set EN 48383 and EN 46105 Alternative for Vauxhall/Opel/Saab/Cadillac/Buick/Chevrolet/Pontiac/Equinox/Saturn/Holden 2.8L. The camshafts must be held at TDC to properly set timing, especially once the inner timing chain is set. See ST-118 for a Built In The USA alternative. This is a high-quality aftermarket tool set but they aren't made in the USA. Both EN-48383-1 and EN-48383-2 are slotted to allow them to be installed over the SIDI drive portion of the camshaft in future applications. Applications: High Feature V6 (2.8L, 3.0L, 3.6L)