Page 146 of GM Performance Parts 2006 Catalog by GM Parts Direct

Bare Cast Iron Cylinder Head A Cast Iron Vortec Cylinder Head (exhaust) B Cast Iron Vortec Cylinder Head (intake) B 144 Cast Iron Vortec Cylinder Head (combustion chamber) B SERVICE REPLACEMENT HEADS These heads are designed to be direct replacements for the heads that came standard on most GM V-8 small-block engines from 1987-newer. They are perfect to replace worn or damaged heads, and they are built with the same high quality standards that you have come to expect from GM. Service Replacement Head Technical Notes: Cast iron cylinder head Straight spark plugs Uses 1.94"/1-50" valves. No heat risers A. 10159552 Bare Cast Iron Cylinder Head Bare cast iron head, no additional parts 64 cc combustion chamber Center two intake bolts are at 72 angle 93438649 Cylinder Head Assembly with valves for 290 HP This cast iron cylinder head services 350/290 hp crate engine as well as Goodwrench base 350 P/N 10067353. The bare head for this assembly is P/N 93438648. 76 cc combustion chamber Standard old style 6-bolt intake pattern This head is assembled with the following components: 14075641 Intake Valves 10241744 Intake Spring Retainer 10241743 Exhaust valves 14042575 Exhaust Spring Retainer 94666580 Valve Springs 10212810 Intake Seals 24503856 Valve Locks 12564852 Exhaust Seals VORTEC CYLINDER HEADS Americas favorite high performance cast iron small-block cylinder head offers big power at an incredible value. The modified combustion chambers and high velocity port technology offer impressive power gains at an affordable price. The Vortec head significantly outflows our non-Vortec service replacement head and offers a 20-40 horsepower increase over earlier cast iron heads. They will fit 1955-and-later small-blocks except for the LT1/LT4 and LS Family of engines. Take your small-block to the 350 horsepower level with a set of Vortec cylinder heads. These heads require Vortec specific intake manifolds. B. 12558060 Cast Iron Vortec Cylinder Head Assembly Completely assembled with 1.94 /1.50 valves Uses bare head 12529093 64 cc 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 Valve spring seat diameter is 1.48" 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 12564852 Valve Locks CHEVY SMALL-BLOCK V-8

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