1in x 5 1/8in A/C Riser

The 1in x 5 1/8in A/C Riser by TRANS-DAPT is a critical spacer component designed to reposition your air conditioning compressor bracket away from the engine block. This riser solves clearance conflicts that arise when installing larger displacement engines, aftermarket intake manifolds, or high-rise cylinder heads in tight engine compartments. Whether you're building a restomod, upgrading to a more aggressive cam profile, or retrofitting a modern powertrain into a classic chassis, A/C riser blocks prevent costly interference issues while maintaining proper compressor mounting and belt alignment.

Engineered by TRANS-DAPT, a trusted name in engine bay solutions, this riser provides a precise 1-inch vertical offset with a robust 5 1/8-inch mounting face to distribute compressor load safely across the engine block. The compact footprint (weighing only 0.21 lbs) ensures minimal mass penalty while maintaining structural rigidity under the vibrational stress of engine operation. The standardized bolt pattern accommodates most universal A/C compressor brackets, and the riser's thickness is calculated to prevent compressor-to-intake or compressor-to-head interference without requiring additional belt routing modifications or idler pulley adjustments.

This riser is essential for engine builders, custom automotive technicians, and enthusiasts tackling engine swaps or significant modifications. It pairs seamlessly with performance cylinder head conversions, big-block to small-block downsizing projects, and turbo or supercharger installations where underhood real estate is at a premium. Compatible with most domestic and import platforms, the TRANS-DAPT 1in x 5 1/8in A/C Riser ensures your climate control system remains functional and secure—a non-negotiable detail for reliable street or track machines. Proper installation requires retorquing all fasteners after initial break-in to maintain compressor alignment and prevent premature bearing wear.