[JDL]

12480034 Phase 3 Cast Iron Bow Tie Head
The Phase 3 Bow Tie Head Casting, PN 12480034, replaced the Phase 2 casting in 2000. This casting was only changed to add machining stock for the machined rocker cover rail. Universal spark plug seats are also provided in this head. (See chart for specifications.) (Recommended service parts: 3973416 - 3/8" rocker stud; 3921912 - 7/16" rocker stud; 39373418 - push rod guideplate.)

Technical Notes: This cylinder head does not include rocker studs or guide plates.


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12480053 Phase 2 Cast Iron Bow Tie Head
The Phase 2 Bow Tie Head Casting, PN 14011034, replaced the Phase 1 Bow Tie Head in 1991. This casting features water jacket walls thicker than production and provides metal for porting of inlet and exhaust ports and .300" thick deck material for milling of the head. Machining was changed in 2000 to provide universal spark plug seats (gasket or taper). (See chart for specifications.)

Technical Notes: This cylinder head does not include rocker studs or guide plates.



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