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california gas to diesel swap smog requirements - Pirate4x4.Com : 4x4 and Off-Road Forum

BAR's own rules book:

under section 3.1.0 for referee inspection services; a vehicle must go to a referee when "a vehicles engine has been changed to a non-replacement engine and is not equipped with a BAR referee label". if the engine was offered in that frame in that year then it is considered a replacement engine. a good example of this is the mid 80's fullsize 3/4 or 1 ton trucks. they offered small block, big block and diesel engines; a swap of any of these three is considered acceptable as long as it retains all of the associated emissions equipment that went along with the engine being installed, is from that chassis' model year or newer, that the transplant engine went in that chassis originally.

read this section on page 73 of the BAR's inspection manual, it covers engine change guidelines;
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