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1978 23l swapt to 1981 57l

T

thorincorliss

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"I have a '78 cobia sports

"I have a '78 cobia sportster w/ 2.3L OMC and found a smoking deal on a repairable 5.7L with ALL mounting/tilt attachments. It even comes with it's own intermediate housing still attached. How much trouble am I getting into swapping these two motors? I have OMC 400 outdrive, will this handle the hp from the new engine?"
 
"you must have a 2.5, the 2.3

"you must have a 2.5, the 2.3 first appeared in a boat in about 1987. The 400 outdrive is only good to 150HP and the gear ratio is specific to a certain HP range. so, no."
 
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