decked means where the heads bolt on have the block and cylinders cut down to get a better surface for the head gaskets to seal too. with your heads shaved it will run hot and plus eat starters due to raised compression. may be really hard to start when motor is warm due to the starter may not be able to turn over the motor. they do make a cylinder repair ring where you cut down the out block casting on the cylinder sleeves and you insert these rings so that your head gaskets will seal correctly. but you need new or good used heads. sell those to some poor other boater with low compression worn motor.
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1978 V20 Cuddy w/ 225 Johnson. And Several other boat's
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