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Discussion Starter · #1 ·
I'm getting ready to put the heads on my 402 block, but want to be sure I'm using the correct sealant on the bolts. On this site it says to use sealant on the water jacket bolts. I have some Permatex high temperature thread sealant. Is this what I need?

Another dumb question, but how do I determine which are the water jacket bolt holes? Just put sealant on all of them? How clean should these bolts be? I cleaned them up, but still not looking to clean
 

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Discussion Starter · #2 ·
I was also wondering about the head gasket. Why is the water hole in the gasket so small compared to the hole in the block and heads? I attached the photo, since I'm sure I'm not making sense.

This is the gasket covering the hole



Gasket moved to show larger hole

 

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Go to your local GM dealer and get a tube of PN 12346004 teflon liquid pipe/thread sealant. It will do 6-8 engines worth of head bolts. IMHO this is the best stuff. The anaerobic sealant is designed for flat surfaces where there is no gasket used, not threads.
 

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I've always used the brush on brown Permatex aircraft sealer, don't know the # offhand.
 

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I used ARP moly sealer/lube on all head bolts. Seals the water jacket bolts and provides lubrication so all bolts are evenly torqued.
 

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I saw a chart somewhere showing how dry, versus, oil, versus sealers affected the amount of torque needed to create a given clamping force. There was quite a difference and you could be very easily over torquing a bolt when using some compounds. Anyone seen this chart? Might just explain why guys strip out head bolts. Just did a Google search for "Fastener torque charts".
Lots of stuff there.
 

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The 518 is like a heavy sticky grease, I bet it would require a higher torque value. When I worked on small engines (Rotax, etc) the 518 was spec'd for the cases and the threads of the case bolts.
 
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I'm going to come off as a smart-as- and I'm meaning to!

Again.

"Good old Permatex, "Indianhead Shellac Gasket Cement" is made for this stuff!

"I've" used it for darn near everything down through the years!

Messy but works great by me."

Do yourself a favor and use it..

And I've been called on, "My way or the Highway", but NOT here b/c the darned messy stuff is made for this application!!

End of conversation so if you don't want to use it BUY a MORE expensive product so you FEEL GOOD!

pdq67

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Is Indian Head hardening or non-hardening anybody know?
 

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Is Indian Head hardening or non-hardening anybody know?
I am sure we all have our tricks on engine building but I use Indian Head Sealer on head bolts and then I dip each bolt in motor oil right before I install them and I have never blown a head gasket over the years.
 

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Discussion Starter · #16 ·
Now I'm really getting confused. I want to make sure I do it right. I picked up some 518 tonight (small tube was $6. You are right Paul, it is expensive) and am planning on installing heads tomorrow. I guess since I have it, might as well use it. Torque is 75 long bolts and 65 short, correct?
 

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#2 Permatex. Be careful about lubricating threads. If the torque specified is for clean dry threads and you use some anti-seize...well...
 

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Discussion Starter · #19 ·
Sorry if I came off like a dick, but the darn messy stuff flat works.

I've even used it on .020" shim headgaskets, single and two stacked together fine!!

But it's also a mess ta clean off.

pdq67
Didn't think that at all Paul :beers: I just now finished, using that little tube of 518 stuff. Sure didn't seem like enough for 32 bolts, but I'm done.

Now another problem, figured while I was torquing the heads, I'd do cam sprocket, 20 ft-lbs. Snapped a bolt. I think my new torque wrench is off, so now to hunt for another bolt. Took me a while to track down a snapped rod bolt :mad:
 

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#2 Permatex. Be careful about lubricating threads. If the torque specified is for clean dry threads and you use some anti-seize...well...
True, ARP provided torque specs for the bolts, dry, lube with motor oil, and lubed with their moly lube sealer. About 15lbs less than dry I think if you use the moly lube. Even permatex will lube some, not the same as dry metal to metal.
 
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