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GM Performance Parts' new Vortec Bow-Tie iron cylinder heads are available in small- and large-port configurations, and available either bare or fully assembled. Assembled small-port versions carry PN# 25534421 and large-port assemblies carry PN# 25534431. Bare heads are also available.
The Iron Alternative

GM Performance Parts' new Vortec Bow-Tie iron cylinder heads are available in small- and large-port configurations, and available either bare or fully assembled. Assembled small-port versions carry PN# 25534421 and large-port assemblies carry PN# 25534431. Bare heads are also available.  View Related Article