Any LS6 Chevelle required the $503 SS 454 option ... Jeff Mackay of Mackay Engines in Rochester, Illinois, handled the engine rebuild. The block, cast in November 1969, is missing the block ...

The intermediate had been available with the SS package for a few years, and the optional big-block V8 engines came with more than 350 horsepower on tap. But the LS6 took things to a whole new level.

Install was super easy and the included sheetmetal intake did well, making more peak hp than the LS6 intake on our mile 5.7L LS engine. This is a great kit for those looking to get LS engines ...