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Mercruiser 454 Gen 4 block with Gen 6 heads

mopwr2

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Does anyone know if the gen 6

Does anyone know if the gen 6 square port heads will work on a gen 4 chevy 454 block? My rebuilt engine was stolen from Roadway shipping company which was the 370hp motor from mercruiser. Now I'm looking for a replacement. Since these parts are becoming harder and harder to find. A Marine engine builder said that I could use a set of gen 6 heads on my gen 4 block. They say the only difference is the bolt sizes on the front a rear of the heads for bracket mounting. Anyone have any ideas?? Thanks
 
The water passages on the mark

The water passages on the mark IV 454 and the gen 5 heads are different and require some adaptation. I am usure about gen 6 but think it is the same as gen 5. Check very carefully before using.
 
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