Page 208 of GM Performance Parts 2006 Catalog by GM Parts Direct

Bare Cast Iron Gen V VI Cylinder Head (exhaust) A Bare Cast Iron Gen V VI Cylinder Head (combustion chamber) A SERVICE REPLACEMENT HEADS These heads are designed to be direct replacements for the heads that came standard on most 454" and 502" GM V-8 big-block engines from 1990-2000. 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 Machined for 2.18"/1.88" 3/8" valves Non-adjustable rocker design Rectangular intake ports Heat risers Will not work on Mark IV cylinder blocks A. 12562925 Bare Cast Iron Gen V VI Cylinder Head Bare cast iron head 118 cc combustion chambers 7/16" accessory bolt holes 12562926 Bare Cast Iron Gen V VI Cylinder Head Bare cast iron head Machined for 2.18"/1.88" 3/8" stemmed valves 118 cc combustion chambers 3/8" accessory bolt holes (otherwise identical to P/N 12562920) 12562920 Cast Iron Gen V VI Cylinder Head Assembly Cast iron head Completely assembled with 2.18"/1.88" valves 118 cc combustion chambers Uses P/N 12562925 bare casting This head is assembled with the following components: 14097045 Intake Valves 12360874 Valve Spring Retainer Seal Kit 14097049 Exhaust valves 3947880 Valve Locks 14097002 Valve Springs 3875916 Valve Spring Shims Bare Cast Iron Gen V VI Cylinder Head (intake) A CHEVY BIG-BLOCK V-8 206

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