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Aluminum Fast Burn Cylinder Head Assembly (19300955)

Aluminum Fast Burn Cylinder Head Assembly

Maximum bolt-on performance for serious street engines is as close as your local Chevrolet Performance dealer when you order a set of Aluminum Fast Burn Cylinder Heads. Fast Burn technology delivers more horsepower by increasing cylinder pressures, which maximizes air/fuel mixture combustion. The 62cc combustion chamber is designed for use with flat-top pistons. The Fast Burn heads require no additional porting for optimum performance, so all you need to do is bolt them on and go. These ultimate 23-degree Small-Block cylinder heads are the same ones used on Chevrolet Performance 425-horsepower ZZ383 crate engines. The heads can be used on any 4.00-inch bore Small-Block with the standard-flow coolant system.

• CNC-machined aluminum performance 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® gasket P/N 1470 (may require minor trimming)
• 62cc combustion chamber, .400" thick deck (can be milled safely .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 rings
• Raised, machined rocker rails
• 0.530" max valve lift (without modifications)
• Screw-in studs, (3/8" top, 7/16" bottom)
• Dual bolt patterns for perimeter bolt and center bolt valve covers
• Dual bolt patterns for both Vortec and early model intake manifolds
• Uses bare head P/N 12497186
• Use production intake gasket P/N 12529094 for Vortec intakes, dual bolt pattern intake gasket P/N 12497760 for early model or Vortec design manifolds (Fel-Pro® P/N 1289 and P/N 1207 may be used) NEW FAST BURN HEADS. HAS NEW BEE HIVE SPRINGS.

This head is assembled with the following components:
12555331 Intake Valves
12551313 Exhaust Valves
12551483 Valve Springs
12552126 3/8" Rocker Studs
19169661 Valve Spring Retainers
10212810 Valve Stem Seals
10212809 Valve Spring Shims
24503856 Valve Locks

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