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.

Re: Thread sealant
 

I have primarily used the #2 non-hardening the other has teflon in it but either one will be satisfactory.

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.

Re: Thread sealant
 

This works great also for head bolt and studs threads.

Re: Thread sealant
 

Thank you for your responses.

Re: Thread sealant
 

I use the pipe thread sealant in all my builds. Probably 30 - 40 engines with no problems.

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.

Re: Thread sealant
 

Thanks again for all the input.

Re: Thread sealant
 

Thread sealant for me .......