Page 232 of GM Performance Parts 2006 Catalog by GM Parts Direct

Intake Manifold, Oval Port (iron) A High-Rise Intake Manifold, Rectangular Port B High-Rise Intake Manifold, Oval Port C CHEVY BIG-BLOCK V-8 230 Intake Manifold, Oval Port (Holley Carburetors) D NOTE: NOTE: NOTE: INTAKE MANIFOLDS, GASKETS COMPONENTS A. 14097092 Intake Manifold, Oval Port (iron) This economical iron four-barrel intake manifold will fit all 396-502 engines with large oval port heads. Use oil splash shield P/N 346243 (if required). B. 19131359 High-Rise Intake Manifold, Rectangular Port Aluminum, dual-plane manifold can be used with high performance cast iron or aluminum rectangular port heads and is the same as used on 454 HO and 502 HO engine assemblies. Ports do not match Bowtie cylinder heads P/N 14044861 and P/N 14044862, or symmetrical port heads P/N 10051128 and P/N 10051129. C. 12363420 High-Rise Intake Manifold, Oval Port This manifold is designed for all 396-502 engines with GM aluminum heads (1975 and earlier) and large oval port iron heads. It has a dual-plane design with spread bore flange and a dual bolt pattern. It has no provisions for a hot air choke, but will accept a divorced choke or electric choke. It accepts air conditioning and alternator brackets. Use intake manifold gasket P/N 12366985 and bolt kit P/N 12367959. May not fit on many Corvette models. Manifold height is 6" at the rear and 4.5" in front. Check for hood clearance before ordering. 12363421 High-Rise CNC-Port-Matched Intake Manifold, Oval Port Similar manifold design as P/N 12363420 (see above), but it is CNC port-matched to GMPP oval port aluminum cylinder heads. D. 12363406 Intake Manifold, Oval Port (Holley carburetors) Same as manifold P/N 12363420 (see above), but it is designed for use with a Holley carburetor. The dual-plane design requires bolt kit P/N 12367959, which includes 16 bolts (8740 chrome moly 3/8-16 x 1.5" with 3/8" hex head and 16 5/8" O.D. washers), and manifold gasket kit P/N 12366985. It accepts air conditioning and alternator brackets and a latemodel water neck. Will not fit production Corvettes, and may not fit Chevelles. Manifold carb flange height is 4.45". E. 12363407 CNC-Port-Matched Intake Manifold, Oval Port (Holley carburetors) This manifold is the same as P/N 12363406 (see above), except it has been CNC port-matched for GM aluminum oval port heads with large oval port heads (1975-and-older), and all aluminum heads with oval ports. F. 88961161 Intake Manifold, ZZ572/620 engine This aluminum single plane intake manifold is used on the ZZ572/620 engine. The carburetor flange is for a 4150-style carburetor. Use intake gasket P/N 88962213. For tall-deck blocks. G. 88962218 Intake Manifold, ZZ572/720R engine This aluminum single plane intake manifold is used on the ZZ572/720R engine. The carburetor flange is for a Dominatorstyle carburetor. Use intake gasket P/N 88962213. For talldeck blocks.

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