10045007 Valve Spring Retainer For all ZZ3 series engines. When converting ZZZ, ... ZZ1 or ZZ2 engines to ZZ3 series cap, valve spring shield must be ... 12551483. 10185066 Spring Shim Used on ZZ3 series 350 HO engines. Spacer is 1.35" ... Stem Seal Seal used on LT4 heads and GM Performance Parts head assemblies P/N ...
. P/N 12370839 cannot be used on ZZ3 engines with orange valve springs. ... nuts, known as "kool nuts," are used on GM circle track engines. Package contains ...