09-13-2022, 01:03 AM
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Senior Member
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Join Date: Mar 2017
Location: ABQ, New Mexico
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Quote:
Perhaps the 427’s greatest improvement over the 409 was in the cylinder heads and intake manifold. Like the high-performance versions of the 409, the 427 used 2.19-inch intake and 1.72-inch exhaust valves, but the 427’s head castings were taller. This allowed the ports to be located higher for a straighter path from the intake into the combustion chamber. The dual-carburetor aluminum intake manifold was unique, too, and made in two pieces: the lower part served as the lifter valley cover and contained the water jackets, while the upper portion housed the raised intake runners. A pair of Carter AFBs topped the intake and drew air through a special cowl-induction inlet that fed the air cleaner.
Chevrolet reportedly made 57 Z-11s before GM pulled the plug on all of its racing programs. The 427 represents the pinnacle of W engine performance development and is legendary among enthusiasts of the breed today.
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Last edited by Lee Stewart; 09-13-2022 at 01:05 AM.
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