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500EFI Thermostat to Headers plugged

Old 08-10-2020, 10:42 AM
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Default 500EFI Thermostat to Headers plugged

Looking at a boat with 500efi's that have been rebuilt and have Hardin Marine 500 EFI Flame Arrestor Upgrade Kits. The tubes running from the thermostat housing to the headers have been plugged. Owner doesn't know why and I am having a hard time finding any information on why it would be done. Benefits/drawbacks? Purpose?

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Old 08-10-2020, 11:07 AM
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so there plugged at both ends ? or the T stat doesnt have the ports
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Old 08-10-2020, 11:10 AM
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Heading down this afternoon to review and water test. This is from the pictures I have.
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Old 08-10-2020, 11:12 AM
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I can see the air cleaner being the issue ( over sized ) interfered with the routing of the hoses ?
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Old 08-10-2020, 11:27 AM
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Hard to tell from the pics but id venture to say the flame aresstors are so big that they were hitting the "T" fitting at the top of the thermostat and it was removed to make room...but in doing that they had to plug the hoses off that were going to the headers. I find that strange cause if memory serves me right i thought there was a plug on the front of the housing you could take out to move that "T" fitting to the front and still keep the hose plumbing....unless the one i remember see was drilled and tapped for the "T" after the fact.......hmmm puzzled
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Last edited by Wally; 08-10-2020 at 11:27 AM. Reason: spelling
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Old 08-10-2020, 11:45 AM
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I was thinking the same thing on the housing. I'll know more this afternoon. Didn't know why someone would do this.
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