As most of you know, GM has used a 6.0L engine in many recent applications. These include C5 and C6 Corvettes, many trucks, Pontiac GTO, the new Pontiac G8, and others. This is the NEW 6.0L engine. It's, of course, built on the Gen III small block architecture. The bore and stroke configuration of this engine is 4.00" X 3.62" and it displaces 364 cubic inches.
However, it's not the first 6.0L engine GM has produced. The first was introduced way back in the later 60's and it was based on the Mark IV big block architecture. It was never installed in any passenger car, though; it was strictly a truck engine, although it was used in light duty, medium duty and heavy duty models. It displaced 366 cubic inches. It didn't have a bore and stroke configuration like the modern-day engine, though. It had a bore of 3.938" (just 1/8" larger than a 283) and a stroke of 3.76" (same as 396 and 427). So, unbeknown to many, there was once-upon-a-time a big block with a bore size smaller than 4".
The 366 lived for quite awhile, although I don't know just when it was officially discontinued from manufacture. I do know, though, that it did not survive into the Gen V period which began in 1991. Also, by the early 1970's, I believe the 350 cid small block displaced the 366 for most light truck applications and the 366 became more-or-less only used for MD and HD trucks.
However, it's not the first 6.0L engine GM has produced. The first was introduced way back in the later 60's and it was based on the Mark IV big block architecture. It was never installed in any passenger car, though; it was strictly a truck engine, although it was used in light duty, medium duty and heavy duty models. It displaced 366 cubic inches. It didn't have a bore and stroke configuration like the modern-day engine, though. It had a bore of 3.938" (just 1/8" larger than a 283) and a stroke of 3.76" (same as 396 and 427). So, unbeknown to many, there was once-upon-a-time a big block with a bore size smaller than 4".
The 366 lived for quite awhile, although I don't know just when it was officially discontinued from manufacture. I do know, though, that it did not survive into the Gen V period which began in 1991. Also, by the early 1970's, I believe the 350 cid small block displaced the 366 for most light truck applications and the 366 became more-or-less only used for MD and HD trucks.
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