Description CNC-machined aluminum performance cylinder head Completely assembled with 2.000"/1.550" valves 210cc intake port, roof raised .240" 78cc D-shaped exhaust ports, raised .200" — requires Fel-Pro® exhaust gasket P/N 1470 (may require minor trimming) 62cc combustion chamber, .400" deck (can be milled up to .060") No heat riser Angled spark plugs ( 5/8" hex, 3/4" reach, tapered plugs) 1.48" valve spring seat diameter Use head gaskets with stainless steel fire ring Raised, machined rocker rails .530" maximum valve lift (without modifications) Screw-in studs ( 3/8" top, 7/16" bottom) New “time-serts” prevents oil migration through rocker studs Dual bolt patterns for perimeter-bolt and center-bolt valve covers Dual bolt patterns for Vortec and early-model intake manifolds Machined bare head Part Number 19417591 Use intake gasket Part Number 1930168
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