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Fairly certain its same engine just rebranded....look under some of the GS20 threads, one i remember specifically addresses this question. Hope this gets you in right direction.
Thanx Guntersville230, I did follow the discussions. In my opinion there are only rumors. Also Nautique says 400hp for the GS20 vs 409 at the ZR6. Unfortunately there is no data sheet available...
It's really interesting. The 2017 websides of nautique and PCM show no info to the ZR4. Also my dealer only knew only the rumors like no closed cooling and similar to the ZR6. Also interesting that all GS20 owners ordered an engine without any data...
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