Join Date: Jan 2001
Location: Georgia, USA
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When you remove material from the mating surfaces of the block or heads during resurfacing, your compression will increase and your clearances will decrease. The thicker head gaskets compensate for this issue. You'll want to do some additional research on o-rings and fire-rings and talk with some very experienced diesel engine machine shops that are familiar with the procedures. Basically, a concentric groove is cut into the block or heads (in this case your block would get the groove) and a metal ring is placed in the groove. With an o-ring set-up, you'd use non-modified gaskets, while a fire-ring set-up requires the crush-ring to be removed from the head gasket. In general, an o-ring set-up is typically preferred for the more mildly built engines and those that see daily driver duty. Fire-rings are commonly used in the most extreme engine builds, and can have longevity issues.
Hope it helps,
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