Fitting the LS1 was a bit of a challenge. In 2010, there weren't as many options as there are today, and the Edelbrock headers were the first affordable long-tube headers available for the Chevelle chassis. I picked the Autokraft baffled road-race pan, and wanted to keep the stock low-mount F-body accessories for a clean look while also keeping it all factory GM so it could be serviced with replacement parts from any parts store anywhere in the country.
With engine mounts in the stock location, I had interference of the tie rods to the pan, alternator to the steering box, and the headers hung lower than the crossmember. All of these problems were solved by raising the engine up about an inch, and offsetting it about 1/2" to the right. With the tunnel cut completely out, I had a blank slate for engine placement.
AC compressor fitment required notching the RH frame horn for clearance, and drilling one well placed hole in the crossmember to be able to feed a bolt into the back side of a bracket.
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