The 1955-2001 Chevy Generation I & II Small Block V8's are very popular for Jeep swaps. Stock Small Block series engines consist of the following displacements: 265, 283, 305, 307, 327, 350, 400. Some of the reasons for the popularity of these engines are: availability, outstanding parts interchangeability, compactness and light weight, plus the fact that these engines fit nicely in most Jeeps. These engines have been popular choices since the mid-sixties, and because they are so familiar, the information and parts required to swap them are more widely available than with any other motor.

The Generation III+ engines are creeping quickly up on the classic Small Block in popularity. However, the Chevy V8 is essentially immortal in reputation and implementation.

- The Novak Guide to Installing Chevrolet Engines in Jeep Vehicles