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Includes standard thickness 3.9L Cummins head gasket modified for the use of fire rings.
Requires the machining of grooves into the cylinder head or engine block for use.
6 mild steel rings included.
Detailed instructions on machine guidelines are included.
Want to read more about Fire Ringing vs O-Ringing your cylinder head? Click here!
IF YOU NEED 10 or 20 OVER STOCK THICKNESS, PLEASE ALLOW 2 WEEKS BEFORE SHIPMENT.
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