Specifications

Why we do not recommend O-Ringing the Mopar Cylinder Heads
Cylinder heads can be o-ringed but you'll need the matching block to make sure they're aligned
properly. No production engine has perfectly aligned combustion chambers or bores so there will be
inconsistencies in the exact alignment of the heads vs. block. The best way to o-ring (when using factory
style gaskets) is either cutting a groove around the bore for a mechanical lock or using a wire - on the
block. The block is mu ch less prone to warping and won't distort slightly like cylinder heads when set at
proper torque specs. If you want to use the o-ring and receiver groove, you'll need copper gaskets or
composite gaskets that work with the o-ring and receiver grooves. Yo u also need to make sure that the o-
ring is not too close to the fire-ring on the head gasket. If it's too close, well...you can see what happens in
the pictures below (this was with only 4# boost and only 10 miles down the road - no detonation either).
(1) Passenger-Side Head Gasket: Blown cylinder (4-
5# boost) - Notice O-Ring impression - Misaligned
(2) Passenger-Side Head Gasket: #2 Cylin
der (Notice
misaligned O-Ring and partially crushed fire-ring
due to misalignment of O-Ring)
(3) Driver-Side Head Gasket: #4 (Notice the fire ring
at the top of the cylinder - ring partially distorted due
to misaligned o-ring)
(4) Same as #3 (Better View)
(5) Passenger-Side Head Gasket: #8 Blown (Fire
Ring was crushed at top of cylinder - misalignment)