Thermostat Change on 250 i6. Thread sealer on bolts? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Luke87gt · 08-30-2024, 09:29 PM

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!

lil hoodlum · 08-31-2024, 03:18 AM

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.

**'68OrangeSunshine** · 08-31-2024, 04:10 PM

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.

Luke87gt · 08-31-2024, 09:27 PM

Thank you for the confirmation

**'68OrangeSunshine** · 08-31-2024, 10:10 PM

Sure

08-30-2024, 09:29 PM	#1
Luke87gt Registered User Join Date: Feb 2024 Location: Pleasanton CA Posts: 470	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! __________________ 1969 C10 Shortbed

08-31-2024, 03:18 AM	#2
lil hoodlum Registered User Join Date: Oct 2009 Location: Denton, Texas Posts: 1,801	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. __________________ 1968 C10 327, 3 speed manual, LWB stock height daily driver. 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.

08-31-2024, 04:10 PM	#3
'68OrangeSunshine Senior Member Join Date: Feb 2002 Location: Tucson, AZ USA Posts: 8,118	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. __________________ Every 25 years I like to rebuild that 292, whether it needs it or not.

08-31-2024, 09:27 PM	#4
Luke87gt Registered User Join Date: Feb 2024 Location: Pleasanton CA Posts: 470	Re: Thermostat Change on 250 i6. Thread sealer on bolts? Thank you for the confirmation __________________ 1969 C10 Shortbed

08-31-2024, 10:10 PM	#5
'68OrangeSunshine Senior Member Join Date: Feb 2002 Location: Tucson, AZ USA Posts: 8,118	Re: Thermostat Change on 250 i6. Thread sealer on bolts? Sure __________________ Every 25 years I like to rebuild that 292, whether it needs it or not.



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