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7.4 Thermostat housing old or new??

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7.4 Thermostat housing old or new??

Old 04-22-2014, 02:35 PM
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Default 7.4 Thermostat housing old or new??

Please help my thermostat housing got lost in a move and refurbish. I have a 1988 Chaparrel Villian 111 with a 7.4 Mercruiser Bravo1 and cant figure out if my housing was the old design or new. This has been a 5 year project and planned on getting in the water this year (so please don't judge me for not knowing, I cant remember ha ) The model # on the valve cover is worn off so not sure on model #

Thanks for the help
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Old 04-23-2014, 08:28 AM
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Ayuh,.... You can use the old style, Or the new style, so long as ya plumb yer manifolds to match,...

I imagine the original was the old style, with the check-balls,...
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Old 04-23-2014, 10:31 PM
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The second one looks like a raw water cooled thermostat.
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