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head bolt sealant???

60K views 22 replies 20 participants last post by  67RAT 
#1 ·
blue rvt on head bolts into water jackets????what do you people use????

rth
 
#9 ·
#10 ·
RTV is the ABSOLUTE LAST product I'd use. I would use my own snot before I installed RTV as a head bolt sealer.

Loctite Pipe Sealant with Teflon was used by several OEMs, including Chevrolet.
Note the initials PST!

My first choice is either of these two Loctite formulations:
Loctite 592

j

or Loctite 567



Either product--592 or 567--is superior to the Loctite/Permatex thread sealer pictured in a previous post. (But that sealer is superior to RTV!)
 
#11 ·
I've been using RTV on Chevy head bolts since I found out it existed back in the olden days. No problems that I know of. I never use that cheapie blue stuff though. Always one of the Ultra products.

For instance, the 400 block in my DD Chevelle has 6 cracks from the steam holes to the adjacent head bolt holes. Installed studs with RTV, that was in 2001. Seems to be working OK so far. :)

Never any shortage of perspectives here at Chevelles.com.....
 
#13 ·
I have used the liquid K&W Copper Coat for 30 years and it works good. But all the thread sealant mentioned works good too. The problem that I have seen when using RTV is over application. Most people have a tendaency to use too much, all the excess has to go somewhere and that is what will cause a problem.
 
#14 ·
I've been using the Permatex thread sealant w/teflon (pictured above) for more years than I can remember (I didn't realize that it is now owned by Loctite).
I've tried others over the years and keep coming back to it (back to stay now).
I buy the large bottle and just dip head bolts into the bottle.
Before assembly, I use brake cleaner to flush any oil out of the block threads (then dry the threaded holes with compressed air) so that the sealant isn't compromised in making a good thread seal. :thumbsup:
 
#17 ·
I've used Ultra Copper in the past with no issues at all. However, on the last one I put together, I used the Loctite thread sealent. Just seemed like a better idea.

For small blocks, GMPP sells a nice head bolt kit for cheap, and the bolts have a sealant patch pre-applied.
 
#19 ·
Pipe thread sealant with teflon here also from my plumbing bucket. Little heavy/thick...hope it doesnt throw off the torque readings. Then again, Permatex 2 is even thicker and nastier, and it works. That stuff is too dirty/messy for me anymore.
 
#23 ·
hope I have no leaks,my old motor had nothing for sealant,my old shop installed the heads-
they didnt use anything...they will never do anything for me again-they also honed it to 4.312-should have been sleeved or overbored to 70 over-lets drill the customer!!!!!crooks!!!
was same shop that built for freddy raimer,and billy pauch---dirt track winners!!

time will tell how the thread sealant works out--

rth
 
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