Spectre Performance Water Neck Features: Polished Billet Aluminum Height: 3.50 Width: 3.50 Length: 5.00 Weight: 1.00 lbs Fitment: 1981/GMC/K3500/Sierra Grande Standard Cab Pickup 2-Door/7.4L 454Cu. In. V8 GAS OHV Naturally Aspirated^^1981/GMC/K3500/Sierra Grande Standard Cab Pickup 2-Door/5.7L 350Cu. In. V8 GAS OHV Naturally Aspirated^^1981/GMC/K3500/Sierra Grande Crew Cab Pickup 4-Door/7.4L 454Cu. In. V8 GAS OHV Naturally Aspirated^^1981/GMC/K3500/Sierra Grande Crew Cab Pickup 4-Door/5.7L 350Cu. In. V8 GAS OHV Naturally Aspirated^^1981/GMC/K3500/Sierra Grande Cab & Chassis 4-Door/7.4L 454Cu. In. V8 GAS OHV Naturally Aspirated^^1981/GMC/K3500/Sierra Grande Cab & Chassis 4-Door/5.7L 350Cu. In. V8 GAS OHV Naturally Aspirated^^1981/GMC/K3500/Sierra Grande Cab & Chassis 2-Door/7.4L 454Cu. In. V8 GAS OHV Naturally Aspirated^^1981/GMC/K3500/Sierra Gran...