From CRG....
http://www.camaros.org/copo.shtml talking about ZL1 production engines vs Can Am engines.
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In production form, the engine differed from Can-Am configuration. The dry-sump oil passage was eliminated and provision for a mechanical fuel pump added. Production tooling was developed for the block (castings #3946052/53), cylinder heads (#3946074), and intake manifold (#3933198). A new aluminum water pump was to be included (and at least one and perhaps two Camaros were built with it), but last minute testing raised reliability questions.
Chevrolet continued to develop the Can-Am version of the aluminum big block for racing, progressing to a liner-less 390-alloy block buildable in displacements of 430, 441, 494 and 510 cubic inches. These did not have provision for a mechanical fuel pump. They were never used in production and few were produced.
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