Product Description:
Camaro/Firebird GM Performance Vortec Cylinder Head Assembly, Cast Iron, 64cc. This is for one head only.
Replaces old part # 12558060
An easy way to gain 20-40 horsepower on any 1955-and-newer Small Block Chevrolet V8 (except later LT1/LT1 Engines) is by installing a set of Vortec cylinder heads. These value priced cast iron cylinder heads use modified combustion chambers and high velocity port technology to provide improved performance. These cylinder heads are ideal for applications up to 350 horsepower, but they require Vortec-specific intake manifolds.
Cast Iron Vortec Cylinder Head Assembly
Completely assembled with 1.94/1.50 valves
Uses bare head 12529093
64cc combustion chamber
Straight spark plugs
No heat risers
Requires Vortec specific intake manifold
Camshafts with more than 0.475 lift require machining
valve guide bosses and checking valve seal to valve spring retainer clearance
Can be machined for 2.02/1.60 valves
Rocker arm studs can be pinned or drilled and tapped to 3/8
Valve spring seat diameter is 1.28
Casting number 10239906 or 12558062
This head is assembled with the following components:
10241743 Intake Valves
10241744 Valve Spring Retainer
12550909 Exhaust Valves
10212810 Intake Seals
10212811 Valve Springs
12564852 Exhaust Seals
24503856 Valve Locks
Completely assembled with 1.94/1.50 valves
Uses bare head 12529093
64cc combustion chamber
Straight spark plugs
No heat risers
Requires Vortec specific intake manifold
Camshafts with more than 0.475 lift require machining
valve guide bosses and checking valve seal to valve spring retainer clearance
Can be machined for 2.02/1.60 valves
Rocker arm studs can be pinned or drilled and tapped to 3/8
Valve spring seat diameter is 1.28
Casting number 10239906 or 12558062
This head is assembled with the following components:
10241743 Intake Valves
10241744 Valve Spring Retainer
12550909 Exhaust Valves
10212810 Intake Seals
10212811 Valve Springs
12564852 Exhaust Seals
24503856 Valve Locks
