Page 210 of GM Performance Parts 2006 Catalog by GM Parts Direct

Bowtie Rectangular Port Aluminum Cylinder Head (intake) A Bowtie Rectangular Port Aluminum Cylinder Head (combustion chamber) A Rectangle Port Heads 12363408 Bare Bowtie Rectangular Port Aluminum Cylinder Head This head is NHRA-legal and is a replacement for 1969 L88 cylinder heads used on 1969 Camaros and 1968-1971 Corvette big-block engines. Aluminum performance head Replacement for P/N 14011076 Machined for 2.19"/1.88" valves 315 cc rectangular cast intake port 110 cc exhaust port 118 cc combustion chamber 12363410 Bowtie Rectangular Port Aluminum Cylinder Head (bare) Bare aluminum performance head Machined for 2.19"/1.88" valves 300 cc rectangular intake port 110 cc exhaust port 118 cc combustion chamber A. 12363400 Bowtie Rectangular Port Aluminum Cylinder Head Assembly Aluminum performance head Completely assembled with 2.25"/1.88" valves 300 cc rectangular intake port 110 cc exhaust port 118 cc combustion chamber Uses bare head P/N 12363410 This head is assembled with the following components: 12366987 2.25" Intake Valves 12366990 Valve Spring Retainers 12366988 Exhaust valves 12366992 Valve Locks 12462970 Valve Springs 12495690 Valve Seals 3875916 Valve Spring Shims 3921912 Rocker Arm Studs 3860038 Pushrod Guideplates B. 12499255 Bowtie 572/620 Cylinder Head Assembly Aluminum head assembly Used in the 572/620 GMPP crate engine Completely assembled with 2.25"/1.88" valves Valve springs for hydraulic roller cams for up to .632" lift 310 cc rectangular intake port 118 cc exhaust port raised 5/8" 118 cc combustion chamber Not recommended for engines smaller than 572 cid This head is assembled with the following components: 12366987 2.25" Intake Valves 12366990 Valve Spring Retainers 88963128 Exhaust valves 12366992 Valve Locks 88963934 Valve Springs 88963936 Valve Seals 88963937 Valve Spring Shims 3921912 Rocker Arm Studs 88963935 Valve Spring Locators 3860038 Pushrod Guideplates 88961160 Bowtie 572/720R Cylinder Head Assembly (not shown) Aluminum racing head assembly Used in the 572/720R GMPP crate engine Completely assembled with 2.25"/1.88" valves Mechanical roller valve springs not for use with hydraulic roller cams Good to .720" valve lift 310 cc rectangular intake port 118 cc exhaust port raised 5/8" 118 cc combustion chamber Not recommended for engines smaller than 572 cid This head is assembled with the following components: 12366987 2.25" Intake Valves 12366990 Valve Spring Retainers 88963128 Exhaust valves 12366992 Valve Locks 88963933 Valve Springs 88963936 Valve Seals 88963937 Valve Spring Shims 3921912 Rocker Arm Studs 88963935 Valve Spring Locators 3860038 Pushrod Guideplates Bowtie Rectangular Port Aluminum Cylinder Head (exhaust) A CHEVY BIG-BLOCK V-8 208

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