When I got home and had a compression check done it showed two low cylinders. Pulled the motor apart and ha 4 cracked valve seats on the 990 heads. everything was in bad shape so I decided to rebuild the motor with all new parts and increase the cid to 496. the only thing used of the motor was the 10 quart Dooley oil pan. The four bolt mark IV block was purchased from JD marine. New merlin III heads, scat 9000 crank shaft, h beam rods, clevite bearings probe 18cc domed pistons, 850cfm holly marine carp and edlebrock airgap intake topped of the motor. Spark is provided by a dui marine 7000 distributor with dui live wires. All black red horse push lock fittings were used with black hose. V drive was rebuilt by rod at finnies, Dave at Connolly marine checked it and added two gaskets to gain a little more clearance. the velvet drive was rebuilt by bergeron everything is either new or rebuilt.
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