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The JE Pro Seal head gasket for Chevrolet Big Block Mark IV and Bowtie engines is specified at 4.63 in bore with 0.039 in thickness for direct-fit replacement in compatible heads and blocks. As part of JE’s Pro Seal family, it provides the stated bore and compressed thickness for engine rebuilds or head gasket replacement. Reference C5331-040 to confirm correct sizing.
JE Pro Seal Chevrolet Big Block - Mark IV & Bowtie 4.63in 0.039in Headgasket (ref C5331-040)
