i can tell you 2000 hours was a standard test time for automotive fuel system parts...it would eqaul roughly 100,000 miles
but an automobile doesnt run over 4000 rpm when cruising and isnt run at 1000 rpm all day trolling..people tend to run boat motors at extreme rpms either high or low .....really depends on price ....a 350 chevy is cheap to rebuild
2000 hrs isn't a ton and still has plenty more if it's been taken care of. But, that hr mark is about the time for a valve Job for a boat that has been trolled. Guy on my dock has 7000-8000 hrs on his Twins. He's finally gonna re-power this yr.
I think I would run a compression check ,I think it is about a time for a rebuild ..pull the plugs and look for oil valve guides may be warn ..It has been my experience that many neglect the oil changes I use to change oil every 100 hrs, I was a pain but I felt it needed to be done
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