Small and Large Port Vortec Bowtie Heads (intake). Bare head shown. Small Port ... 146 Small and Large Port Vortec Bowtie Heads (combustion chamber) VORTEC BOWTIE ... HEADS These are GM Performance Parts most ... powerful cast iron cylinder heads designed for street or racing ... production head, they come with bigger valves, a thicker deck surface, and a 66 cc ... low-lift flow numbers. They offer you Fast Burn performance in an affordable cast ... iron head that are often used for short-track racing applications. Vortec ... Cast iron small runner or large runner heads 66 cc combustion chamber, .450" deck ... spark plugs No heat risers Machined for 2.00"/1.55" valves Hardened exhaust ... valve seats 0.530" max valve lift (without modifications) Drilled ...
Fast Burn Cylinder Head (intake) A Fast Burn Cylinder Head (combustion chamber) A ... . It makes the perfect starting point for you to build a high horsepower version ... of these engines. 12363287 LT4 Aluminum Cylinder Head Assembly (not shown) Aluminum ... Completely assembled with 2.00"/1.55" valves 195 cc intake port 54.4 cc ... hex, 3/4" reach, tapered plugs) 1.48" Valve spring seat diameter Screw-in studs ( ... following components: 12555331 Intake Valves 10212808 Valve Spring Retainers ... 12551313 Exhaust Valves 10212810 Valve Stem Seals 12551483 Valve Springs ... 10212809 Valve Spring Shims 12552126 3/8" Rocker Studs ... 24503856 Valve Locks ALUMINUM FAST BURN HEADS When it comes time to own the ... street, this is the head for you! GM Performance Parts has brought ...