Chevrolet Performance Aluminum Cylinder Head - Assembled - 2.165 / 1.590 in Valves - 260 cc Intake - GM LS-Series 89504 3/4 in Center Hole

3/4 in Center Hole

6 mm Thick Wall

Firebird's exhaust system to bolt up

snaps right in

The rear eyelet is bare and requires factory bushings or optional UMI 2625 (poly) or 2626 (Delrin) bushing and shackle kit

Chevrolet Performance Aluminum Cylinder Head - Assembled - 2.165 / 1.590 in Valves - 260 cc Intake - GM LS-Series 89504 3/4 in Center HoleProduct Description: Cylinder Head Assembled 2. 165 1. 590 in Valves 260 cc Intake 68. 4 cc Chamber 1. 290 in Springs GM LS Series Chevrolet Performance has a wide selection of performance upgrade parts specifically for GM vehicles, as well as crate engines, you can add proven performance to stock vehicles. Looking to personalize your vehicle? Chevrolet Performance is the place. Inside youll discover a complete portfolio of Chevrolet, Buick, GMC and