Jeeps: 4.0L Cylinder Heads

Explore the evolution of 4.0L Jeep cylinder heads from 1987-2005. Learn about casting numbers and key changes for each model year.

IAG 800 CNC Pocket Ported Competition Cylinder Heads Package for 2015-21 WRX

Cylinder Heads

Quick Hit: COMP Cams 4.0L Engine Upgrades For Jeeps

Chevrolet Performance Parts - 19419187 - LSX-LS3 Cylinder Head

PRC 220cc 15-Degree CNC Cathedral Heads w/ .660 springs – Outlaw Race Engines

JEGS 555-514222 Cylinder Heads - Cylinder Head for 1992-2002 Dodge 5.2L & 5.9L Magnum Fully Assembled - JEGS] - JEGS

1998-2006 Jeep Wrangler 4.0L Rebuilt Cylinder head casting # 0331

12711770 - Chevrolet Performance Assembled L92 Cylinder Head Assembly Chevrolet Performance Parts

Cylinder head is shot peened, magnafluxed to check for cracks. Each receive a complete 3 angle valve job. Valve seats are opened up to accommodate

Jeep 4.0L Stage 3 Ported Head w/ Oversized Valves (1991-1999)