Frame and front cross-member clearance issues have been a real problem when installing GM LS engines. We have put together a package that relocates the A/C compressor to the upper right hand (passenger side) of the engine. This package also eliminates the need for a second belt to drive the compressors and converts your drive system to a single serpentine belt driven system.
Grooved idler pulley replacement part number is GM 12609719
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