| All GM LS Gen I & II engines equipped with LS1/LS2/LS6 style cathedral port cylinder head.
 Features
 
•1500-6500 RPM power band
 •4150 Square bore flange
 •Optimized runner layout and constant cross sectional area - broad torque curve, best vehicle performance from 1500-6500 RPM
 •Minimum carb flange height - fit in vehicles with minimum hood modifications
 •Cast aluminum construction - great manifold for carbureted or throttle body EFI street applications
 •Efficient casting design - lightweight, consistent wall thicknesses, improved casting quality
 •Height (front) - 5.07"
 •Height (rear) - 6.14" to the lifter valley cover flange at the engine block front flange and bellhousing flange
 •Port size - 2.454" height x 1.09" wide
 •Mounting flange gasket type - o-ring
 • Includes Viton® o-rings - Viton® is a registered trademark of DuPont Performance Elastomers
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