Page 182 of GM Performance Parts 2006 Catalog by GM Parts Direct

CHEVY SMALL-BLOCK V-8 180 NOTE: Intake Manifold, 18 Competition Intake Manifold, 18 Updated Design B Intake Manifold, Spider Design, 18 Design C Intake Manifolds, Gaskets Components Continued Bowtie Competition Manifolds A. 24502481 Intake Manifold, 18 Competition Developed for NASCARs shorter tracks and works well on Trans-Am-series engines. It features smaller runners and less plenum volume than the P/N 10185053 (see below), which enhances mid-range torque. Aluminum intake fits 18 heads casting P/N 10134363 and P/N24502569. This manifold is ideal for 310-cubic-inch road racing and 358-cubic-inch short track engines. 24502579 Lightweight Intake Manifold, 18 Competition (not shown) Same design as the P/N 24502481 (see above), but 10 pounds lighter. B. 24502487 Intake Manifold, 18 Updated Design This is a revised version of the original Bowtie manifold that enhances mid-to-high rpm power. Material was removed from the outer walls of the four middle runners for an improved line of sight path to the cylinder heads. Aluminum also was added to the walls to permit porting. C. 24502653 Intake Manifold, Spider Design A two-piece dry aluminum manifold spider consisting of the runners and plenum only. The runners, called the spider assembly by racers, along with valley plate assembly the common term for the bottom section of the intake P/N 24502654 (see below), is designed for use with the 18 cylinder heads with a date code of June 1996 or newer. D. 24502654 Valley Plate Assembly This universal aluminum valley plate is designed for use with 18 cylinder heads. It can be used with dedicated twopiece manifold spiders, existing one-piece intake manifolds which have been properly machined for use as a dry manifold, or fabricated manifold designs. The valley plate assembly consists of: the valley plate P/N 24502652, the inspection cover P/N 24502651, O-ring material, and eight retaining bolts. The valley plate has cast-in integral passages to equalize coolant flow from the front and the rear of the cylinder heads. It fits heads dated June 1996 and later. Important information about gasket matching: Gasket flanges are machined to provide the proper port alignment with standard runner locations; runners in heads and manifold must be matched by engine builder. Often the gasket will line up with the top of the port, so removal is required at the bottom of the port. Gaskets that can be used with this manifold are: FEI-PRO P/N 1205 and P/N 1206, and Mr. Gasket P/N 102. Always match the gasket to the cylinder head you plan to use to ensure a correct fit. Valley Plate Assembly D A

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