Weiand 8018 Features: High Rise/Dual Plane Design For Maximum Torque Fully CNC Machined For A Perfect Fit Square Bore Carburetor Flange Exhaust Crossover For Improved Street Drivability Permanent Mold Casting Process Lighter/Smoother/Better Looking More Consistent Castings Height: 6.88 Width: 11.50 Length: 23.00 Weight: 24.20 lbs Fitment: 1989/GMC/V3500/Sierra Classic Standard Cab Pickup 2-Door/7.4L 454Cu. In. V8 GAS OHV Naturally Aspirated::LowerLegal Only For Off-Highway Use Or Racing^^1989/GMC/V3500/Sierra Classic Crew Cab Pickup 4-Door/7.4L 454Cu. In. V8 GAS OHV Naturally Aspirated::LowerLegal Only For Off-Highway Use Or Racing^^1989/GMC/V3500/Sierra Classic Cab & Chassis 4-Door/7.4L 454Cu. In. V8 GAS OHV Naturally Aspirated::LowerLegal Only For Off-Highway Use Or Racing^^1989/GMC/V3500/Sierra Classic Cab & Chassis 2-...