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Search: Posts Made By: Steve Ownby
Forum: Newmar Owner's Forum 05-19-2013, 04:39 PM
Replies: 7
Views: 945
Posted By Steve Ownby
The old ISM, which I have, was 10.8 and maxed at...

The old ISM, which I have, was 10.8 and maxed at 500 hp.
The Small version of the ISX was first 12.9. Then they re designed that engine and it was reintroduced as the ISX13. These were both 500 hp...
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