thread sealing compound

[teardrop puller]

Hey guys

I hijacked another thread with this question and did not get an answer, so I will ask again.

I put cast iron headers and an Offy intake on, now when I run the engine there is a little water leakage that drips on the headers. What is the sealing stuff I should buy,for the bolts, when I go to the States next week.

Which bolts pass through the water jackets. I guess there is no need to put the sealing stuff on the other threads. This is the first flat 6 that I have ever worked on. I think I am going to love this car when it is on the road in a month or so.

thanks

kai

[Young Ed]

We've always used the non hardening black permatex.

[Normspeed]

Same here, non hardening permatex or NAPA has a thread sealant in a tube, it's white like pipe dope. I think I prefer the soft permatex. I don't recall which ones go all the way into the water jacket. I sealed all of them. Figured it couldn't hurt.

[james curl]

I used the white teflon pipe dope in a tube and did all of the head bolts except the three over the intake ports, the water pump bolts, and all other bolts that went into or through the water jacket. In 1000 miles no leaks.

[Don Coatney]

If teflon tape dope fails to work I break out the big guns.

[bob westphal]

If you get leakage through threads after appling proper torque, it is because the threads are deteriorating either on the the stud/bolt or the block. A good thread won't leak. That's why I clean all threads either with a die, tap or wire brushing. A sealer will help stop laeks but does nothing for the actual prtoblem. Deteriorated threads will fail sometime in the future. That's why they make Heli Coils and new bolts/studs.

[teardrop puller]

Thanks for all the great answers.

kai