Product Description

ARP 900-0750 PISTON RING COMPRESSOR — 4.075" BORE — 2001–2016 GM 6.6L DURAMAX

Build faster and cleaner with the ARP 900-0750 tapered piston ring compressor for 4.075" (.020 over) bores. This pro-grade tool is CNC-machined from 6061-T6 billet, hard anodized, and engraved for instant size ID—perfect for Duramax LB7/LLY/LBZ/LMM/LML builds where precision and repeatability matter. Hidden high-impact tags: ARP 900-0750, 4.075 bore ring compressor, Duramax 6.6 piston installation tool, tapered ring compressor, CNC 6061-T6, diesel engine build tools.

• True-radius taper guides the piston/rings squarely into the cylinder for quick, damage-free installs.
• Relieved to clear wire O-rings at the deck; slick anodized finish for long life and easy cleanup.
• Engraved 3/4" size marks—grab the right compressor at a glance on busy build benches.

Fitment

• 2001–2016 GM 6.6L Duramax (LB7 2001–2004, LLY 2004.5–2005, LBZ 2006–2007, LMM 2007.5–2010, LML 2011–2016) with 4.075" (.020 over) bores.
• Also fits any engine with a 4.075" bore requiring a tapered ring compressor.

Cross-References & Helpful ARP Pairings (CPP Links)

• ARP 900-0550 — 4.055" Standard Bore Ring Compressor
• ARP 230-4201 — Duramax Head Stud Kit (LB7–LML)
• ARP 230-5401 — Main Stud Kit (LB7/LLY)
• ARP 230-6301 — Rod Bolt Kit (LB7–LMM)
• ARP 129-2503 — Harmonic Balancer Bolt (2001–2019)
• Shop All ARP at CPP Diesel

FAQ

WHAT IS THE ACTUAL BORE SIZE THIS TOOL FITS?
The 900-0750 is sized for a 4.075" cylinder bore (.020" over common Duramax spec).

WILL THIS WORK ON STOCK (STANDARD BORE) DURAMAX?
No—use a 4.055" tool like ARP 900-0550 for standard 4.055" bores.

WHAT MATERIAL IS IT MADE FROM?
CNC-machined 6061-T6 billet aluminum with a durable Type 3 anodized finish.

CAN I USE THIS WITH DECK O-RINGS?
Yes. The body is relieved at the base to clear wire O-rings on the deck.

DOES IT REQUIRE SPECIAL LUBE?
A light oil on the taper is recommended; follow your ring manufacturer’s assembly guidance.

Specifications for ARP 900-0750