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Ed Rinke Performance

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The ZZ4 Aluminum Head

The ZZ4 Aluminum Head
The revolutionary lightweight ZZ4 aluminum cylinder head was a key
component of the highly successful Corvette L98 Small-Block V-8 engine
(1985-1990). Chevrolet Performance offers that same cylinder head as a
complete assembly, with D-shaped exhaust ports1 (they increase postcombustion
scavenging for increased power), high-velocity exhaust runners
and centrally located spark plugs2 that improve air/fuel mixture burn efficiency
for increased power potential. The ZZ4 aluminum cylinder head is ideal for a
great variety of engine applications.