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Old 11-17-2019, 09:43 AM   #1
mrlaser
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Default Thread sealant

I am about to replace the original cast iron heads on an 8ba V8. I have a question regarding which thread sealant to use. I have both of the pictured products on hand. I also have read some of the prior posts on thread sealants. I am not necessarily asking which is the superior product, I am only inquiring whether both are satisfactory for this use. Thanks for any input.
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Old 11-17-2019, 10:01 AM   #2
36rgtop
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Default Re: Thread sealant

I have primarily used the #2 non-hardening the other has teflon in it but either one will be satisfactory.
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Old 11-17-2019, 10:19 AM   #3
marko39
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Default Re: Thread sealant

Along with applying to the bolts I also smear the threads in the block as much of the sealant from the bolts will be left on top of the block when you screw them in.
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Old 11-17-2019, 10:38 AM   #4
19Fordy
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Default Re: Thread sealant

This works great also for head bolt and studs threads.
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Old 11-17-2019, 11:56 AM   #5
mrlaser
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Default Re: Thread sealant

Thank you for your responses.
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Old 11-17-2019, 05:11 PM   #6
flatjack9
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Default Re: Thread sealant

I use the pipe thread sealant in all my builds. Probably 30 - 40 engines with no problems.
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Old 11-18-2019, 07:20 AM   #7
Bored&Stroked
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Default Re: Thread sealant

Me, I'd use the thread sealant with PTFE. Also, put a good amount of anti-seize on the sides of the bolts and a little bit of moly-lube/grease under the heads to help with more accurate torque readings.

Also, no matter which sealer you use - let the engine sit for at least a day before you fire it up . . . helps stuff harden a bit.
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Old 11-18-2019, 07:27 AM   #8
mrlaser
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Default Re: Thread sealant

Thanks again for all the input.
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Old 11-18-2019, 05:26 PM   #9
Ford Freak
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Default Re: Thread sealant

Thread sealant for me .......
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