Auto Specialties 549920 - Auto Specialties Underdrive Street Pulley Sets Compare Pulley Set, Harmonic Damper, Nitride, Overdrive Alternator, Chevy/GMC, Pickup, 4.8L/5.3L/6.0L, Kit

Product description. BBK Aluminum Under drive Pulley Kit for GM Truck 4.3/5.0/5.7L - 3 Piece is made from aircraft quality aluminum alloy. These BBK under drive front accessory pulley kits are one of the easiest ways to free up an average of 8-15 horsepower in under 30 minutes. Engine VIN Code Z (1) Engine Version Chevrolet (1) Pulley Set Style Performance ratio (7) Power and amp series ratio (6) Standard ratio (1) Pulley Material Billet aluminum (8) Aluminum (3) Steel (3) Pulley Finish Clear powdercoated (5) Black powdercoated (3) Black anodized (2) Nitride (2) Black (1) Polished (1) Engine VIN Code Z (1) Engine Version Chevrolet (1) Pulley Set Style Performance ratio (7) Power and amp series ratio (6) Standard ratio (1) Pulley Material Billet aluminum (8) Aluminum (3) Steel (3) Pulley Finish Clear powdercoated (5) Black powdercoated (3) Black anodized (2) Nitride (2) Black (1) Polished (1) Engine VIN Code Z (1) Engine Version Chevrolet (1) Pulley Set Style Performance ratio (7) Power and amp series ratio (6) Standard ratio (1) Pulley Material Billet aluminum (8) Aluminum (3) Steel (3) Pulley Finish Clear powdercoated (5) Black powdercoated (3) Black anodized (2) Nitride (2) Black (1) Polished (1) Product description. BBK Aluminum Under drive Pulley Kit for GM Truck 4.3/5.0/5.7L - 3 Piece is made from aircraft quality aluminum alloy. These BBK under drive front accessory pulley kits are one of the easiest ways to free up an average of 8-15 horsepower in under 30 minutes. An underdrive pulley is a replacement pulley that bolts up the same as stock, but has a different size (ratio) and material specifications intended to free up lost horsepower. By increasing the diameter of each accessory pulley and decreasing the size of the crank pulley, the speed at which the accessories are turning relative to engine RPM decreases.

Most underdrive pulley kits only underdrive the crank pulley and they compensate for that by overdriving the accesories with a lighter weight pulley. That's where the hosepower is saved. The weight, not the size of the pulley.

An underdrive pulley is a replacement pulley that bolts up the same as stock, but has a different size (ratio) and material specifications intended to free up lost horsepower. By increasing the diameter of each accessory pulley and decreasing the size of the crank pulley, the speed at which the accessories are turning relative to engine RPM decreases. An underdrive pulley is a replacement pulley that bolts up the same as stock, but has a different size (ratio) and material specifications intended to free up lost horsepower. By increasing the diameter of each accessory pulley and decreasing the size of the crank pulley, the speed at which the accessories are turning relative to engine RPM decreases.

BBK Performance underdrive pulley kits are built from aircraft-quality, computer-machined steel or aluminum alloy. By reducing the speed of the accessories, these underdrive pulleys free up an average of 8-15 hp, while retaining full cooling and charging characteristics. Most pulley kits can be bolted on in less than 30 minutes. BBK Performance underdrive pulley kits are built from aircraft-quality, computer-machined steel or aluminum alloy. By reducing the speed of the accessories, these underdrive pulleys free up an average of 8-15 hp, while retaining full cooling and charging characteristics. Most pulley kits can be bolted on in less than 30 minutes. Engine VIN Code Z (1) Engine Version Chevrolet (1) Pulley Set Style Performance ratio (7) Power and amp series ratio (6) Standard ratio (1) Pulley Material Billet aluminum (8) Aluminum (3) Steel (3) Pulley Finish Clear powdercoated (5) Black powdercoated (3) Black anodized (2) Nitride (2) Black (1) Polished (1)

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Product description. BBK Aluminum Under drive Pulley Kit for GM Truck 4.3/5.0/5.7L - 3 Piece is made from aircraft quality aluminum alloy. These BBK under drive front accessory pulley kits are one of the easiest ways to free up an average of 8-15 horsepower in under 30 minutes. An underdrive pulley is a replacement pulley that bolts up the same as stock, but has a different size (ratio) and material specifications intended to free up lost horsepower. By increasing the diameter of each accessory pulley and decreasing the size of the crank pulley, the speed at which the accessories are turning relative to engine RPM decreases. An underdrive pulley is a replacement pulley that bolts up the same as stock, but has a different size (ratio) and material specifications intended to free up lost horsepower. By increasing the diameter of each accessory pulley and decreasing the size of the crank pulley, the speed at which the accessories are turning relative to engine RPM decreases. Engine VIN Code Z (1) Engine Version Chevrolet (1) Pulley Set Style Performance ratio (7) Power and amp series ratio (6) Standard ratio (1) Pulley Material Billet aluminum (8) Aluminum (3) Steel (3) Pulley Finish Clear powdercoated (5) Black powdercoated (3) Black anodized (2) Nitride (2) Black (1) Polished (1) An underdrive pulley is a replacement pulley that bolts up the same as stock, but has a different size (ratio) and material specifications intended to free up lost horsepower. By increasing the diameter of each accessory pulley and decreasing the size of the crank pulley, the speed at which the accessories are turning relative to engine RPM decreases.

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Product description. BBK Aluminum Under drive Pulley Kit for GM Truck 4.3/5.0/5.7L - 3 Piece is made from aircraft quality aluminum alloy. These BBK under drive front accessory pulley kits are one of the easiest ways to free up an average of 8-15 horsepower in under 30 minutes. Auto Specialties 549920 - Auto Specialties Underdrive Street Pulley Sets Compare Pulley Set, Harmonic Damper, Nitride, Overdrive Alternator, Chevy/GMC, Pickup, 4.8L/5.3L/6.0L, Kit