Outopakkle AC Compressor Adapter for GM R4 — CNC 6061-T6 Straight #8 (3/4-16) & #10 (7/8-14) Male Fittings

Outopakkle's CNC-machined 6061-T6 aluminum adapter converts a GM R4 AC compressor port into two straight male A/C line fittings (#8 3/4-16 and #10 7/8-14) without any compressor modification.

This precision adapter block is engineered to provide the correct clearance and thread geometry for LS GM R4 air conditioning compressors, letting you attach standard male A/C lines in a compact, straight configuration. Machined from billet 6061-T6 and finished by CNC cutting, the unit focuses on durability, accurate fitment and corrosion resistance while simplifying plumbing on engine swaps, aftermarket setups, or repairs where the OEM ports don't match available hoses.

How does this adapter fit GM R4 compressors?

The adapter is shaped specifically to clear the R4 compressor housing and align precisely with factory port locations so no trimming or modification of the compressor is required. The block replaces the original port interface with two male-threaded outlet ports sized for common A/C lines.

• Direct fit for GM R4 compressor port geometry
• Provides two male fittings: #8 (3/4-16) and #10 (7/8-14)
• No compressor modification needed—drop-in installation

What materials and finish protect the adapter?

Constructed from 6061-T6 billet aluminum, the adapter balances strength and light weight while resisting corrosion in automotive environments. CNC machining provides tight tolerances and a consistent surface finish that aids sealing and long-term reliability.

• 6061-T6 billet aluminum body for strength and low weight
• CNC-machined surface for precise thread alignment and mating faces
• Durable finish that reduces galling and improves longevity

What fittings and thread sizes are provided?

The block converts the GM R4 compressor interface to two male A/C line fittings commonly used in aftermarket and OE hose assemblies. This lets you attach braided hoses, aftermarket hard lines, or service adapters that accept #8 and #10 male fittings.

• #8 male fitting: 3/4-16 thread
• #10 male fitting: 7/8-14 thread
• Clear, straight routing reduces hose bends and potential leak points

How straightforward is installation and serviceability?

Installation is intended to be bolt-on for R4 compressors when the port orientation matches the adapter. Because the adapter creates straight male outlets, attaching and removing service hoses is simpler and faster, reducing labor time for swaps and repairs.

• Drop-in design for common R4 port layouts—no cutting required
• Straight outlets improve hose routing and access for servicing
• Backed with warranty support from Outopakkle for product issues

Who is this for? Technicians, DIY enthusiasts and performance builders working on LS engine swaps or aftermarket A/C conversions will appreciate this adapter. If you need a reliable, precision-machined way to convert a GM R4 compressor port to standard #8 and #10 male fittings for cleaner hose runs, easier service access, and a robust aluminum construction, this Outopakkle adapter is designed for that purpose.