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Old 08-30-2024, 09:29 PM   #1
Luke87gt
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Thermostat Change on 250 i6. Thread sealer on bolts?

Hi guys, I will be swapping the thermostat on the 1969 250 i6

Question: Do the two thermostat housing bolts require thread sealer? I don’t recall if water has access into those two threads.

If thread sealer is needed, which loctite do you recommend?

Thank you!
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Old 08-31-2024, 03:18 AM   #2
lil hoodlum
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Re: Thermostat Change on 250 i6. Thread sealer on bolts?

Sorry, I don't know about inline 6's, but on a small block it isn't necessary.

For thread sealer, I like to use teflone tape.



Hopefully, someone more knowledgable on inline 6's will post the information you're looking for.
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1968 C20 327, 4 speed manual, LWB stock height custom camper with heavy duty leaf springs rear, 50th anniversary edition. Hoping to press into daily drive status soon.
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Old 08-31-2024, 04:10 PM   #3
'68OrangeSunshine
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Re: Thermostat Change on 250 i6. Thread sealer on bolts?

Thread Sealer isn't necessary on L6 T-Stat housings.
The Thermostat Housing is on an assembly that bolts onto the front of the block. No contact with the water jacket.
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Old 08-31-2024, 09:27 PM   #4
Luke87gt
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Re: Thermostat Change on 250 i6. Thread sealer on bolts?

Thank you for the confirmation
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Old 08-31-2024, 10:10 PM   #5
'68OrangeSunshine
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Re: Thermostat Change on 250 i6. Thread sealer on bolts?

Sure
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