GSTP Alternator Bracket Kit for Chevy Small-Block SBC 265-350 Driver Side Short Water Pump, Adjustable Black

This kit includes the upper arm, slider bracket and header bracket engineered to fit 265–350 small-block Chevy engines configured with short water pumps. Designed for the left (driver) side of the engine, the set provides adjustable tensioning and multiple mounting points so you can position and align the alternator precisely. Finished in black for a clean appearance, the components are made to simplify installation and restore reliable belt alignment on classic and resto-mod engines.

How does this bracket kit adapt to different small-block Chevy engines?

The GSTP kit accommodates common small-block Chevy displacements (265, 283, 305, 327, 350) that use short water pump setups. Slots and multiple bolt holes allow for lateral and vertical adjustment so the alternator can be aligned with various pulleys. The parts are designed to work with factory-style and many aftermarket accessories.

• Fits Chevy SB engines with short water pumps: 265–350 series
• Upper bracket length 14" with a 4" adjustment slot for fine alignment
• Multiple mounting holes for vertical position and angle tuning
• Works with standard alternator sizes and most pulley setups

What’s included and what are the key measurements I should check?

The package delivers three steel components: an upper alternator arm, an alternator slider bracket and a header bracket. The upper arm is approximately 14 inches long and 1 inch wide, with an adjustment slot measuring about 4 inches; small measurement variances may occur due to manual measuring. Confirm your engine’s accessory layout and bolt locations before ordering to ensure compatibility.

• Components: upper arm, slider bracket, header bracket — ready to mount
• Upper arm nominal size: 14" length × 1" width, 4" adjustment slot
• Designed for the left (driver) side installation
• Black finish for corrosion resistance and visual consistency

How difficult is installation and what tools will I need?

This kit is intended for straightforward installation by a home mechanic or professional shop familiar with small-block engines. Typical installation involves removing the old bracketry, positioning the header bracket, attaching the upper arm and sliding the alternator into the adjustment slot to set belt tension. Most steps require common hand tools and basic mechanical experience.

• Installation: bolt-on pieces designed for quick mounting
• Tools commonly needed: ratchet set, wrenches, torque wrench, alignment check tool
• Adjustable slot provides easy belt tensioning without custom fabrication
• 24-hour customer support from GSTP if you run into issues

Will this bracket work with aftermarket headers or accessories?

The GSTP bracket set was engineered to clear many header designs, but fitment can vary depending on the specific aftermarket parts used. Because of the different header tube orientations and accessory sizes, verify physical clearances before final installation. If your setup uses unusually large headers or non-standard accessories, measure mounting points and compare to your engine bay dimensions.

• Designed for compatibility with a broad range of header configurations
• Measure for clearance if using oversized aftermarket components
• Adjustability helps avoid interference with nearby accessories
• Contact GSTP support for fitment troubleshooting and guidance

Who is this for: The GSTP Alternator Bracket Kit is aimed at car restorers, hot-rod builders and DIY mechanics working on Chevy small-block engines with short water pumps who need a sturdy, adjustable driver-side alternator mount. If you want reliable alignment, straightforward installation and a black-finished kit that fits popular SBC applications (265–350), this bracket set provides the core hardware to get your alternator mounted and tensioned correctly.