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The Ram Jet 502 is a crate engine from GM Performance. Its basically a fuel injected ZZ-502.
There is no such thing as a Mark 6. What you are referring to is a Gen VI which is a roller cam block. Its the latest generation of big block from GM. It was available in a 454 or 502. GM dropped the Mark desigination in favor of the Gen designation ever since the Gen V came out. The first production 454 big block Chevys were called the Mark 4. The block remained esentially the same until the mid 90's when the Gen V was introduced. The Gen V had different oil passages and a one piece rear main seal. The Gen V was only out for a couple years until the Gen VI came out. Its basically the same as a Gen V but its made for a roller cam from the factory.
Ron
Last edited by rjcardinal; 08-02-2002 at 03:03 PM.
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