Page 183 of GM Performance Parts 2006 Catalog by GM Parts Direct

Intake Manifold, spider restrictor design SB2.2 E Intake Manifold, spider design SB2.2 F Intake Manifold, spider design SB2.2 G 181 Valley Plate Assembly, SB2.2 H NASCAR Intake Manifolds E. 12480096 Intake Manifold, spider restrictor design SB2.2 This aluminum manifold has more material in the runners and plenum to accept more flexibility in porting. It is designed for NASCAR restrictor plate racing and is used with Valley Cover Assembly P/N 12370840 (see below). F. 88958617 NEW Intake Manifold, spider design SB2.2 Designed for NASCAR-style racing and high-rpm engines. Additional aluminum in the runners and plenum allows more flexibility in porting. This manifold must be used with valley plate P/N 12370840 or P/N 88958659. G. 88958691 NEW Intake Manifold, spider design SB2.2 This manifold is closer to net shape for 390-cfm carburetor applications. This casting is thinner in plenum area and the runner cross sections are closer to finish shape of the current P/N 88958617 manifold used in NASCAR Grand National and Truck series racing. It has the same carb height and plenum floor as P/N 88958617. This manifold must be used with valley plate P/N 12370840 or P/N 88958659. 12370840 Valley Plate Assembly, SB2.2 Aluminum valley cover is used with manifold runners P/N 12480096 and P/N 88958617 on SB2.2 cylinder heads for NASCAR racing. H. 88958659 NEW Valley Plate Assembly, SB2.2 Aluminum valley cover is used with manifold runners P/N 12480096, P/N 88958617 and P/N 88958691. This valley cover does not incorporate an inspection cover, but has revised integral water passage for improved coolant flow from the front and rear of the cylinder heads. 88958666 NEW Intake Manifold, ROX Spider Design Fits P/N 88958667 ROX heads. 88958670 NEW Valley Plate Assembly, ROX Fits ROX manifold P/N 88958666 and ROX head P/N 88958667. Part Weight Volume Notes Number 24502481 22.5 lbs 2700 cc Smaller cross-section for short tracks, (620 cc, small-displacement engines, square plenum opening) 24502487 21 lbs 3000 cc Revised version of 10185053, (700 cc improved "line of sight" path, thicker walls, plenum) with square plenum opening 24502579 11.5 lbs 2700 cc Smaller cross-section (620 cc, small displacement engines, square plenum opening), for short track racing applications This chart illustrates the differences in some of the Bowtie Competition Manifolds. These single plane manifolds fit 18 cylinder heads and are designed with air gaps underneath the runners to insulate the intake charge from engine heat. Manifold flanges are 0.59" thick to promote a good gasket seal. An auxiliary water line boss at the rear of the casting improves water flow. Both P/N 24502481 and P/N 24502487 have square bore carburetor flange openings to match the spacers specified by NASCAR. NEW NEW NEW BOWTIE COMPETITION MANIFOLDS

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