SBC head bolts, RTV or OIL???? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 02-04-2009, 12:32 PM
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SBC head bolts, RTV or OIL????

what are you guys using on the threads of SBC head bolts? I have always used RTV because they hit water but for some reason I forgot to use it last time and I put just oil, the engine has not been fired yet but I'm worried about this issue, I will hate me if I have to remove the heads to clean the oil and put RTV on them threads.

Augusto.

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Old 02-04-2009, 12:35 PM
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I always use ARP thread sealer.
I would be nervous to run it if you didn't put something on there.
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Old 02-04-2009, 12:57 PM
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Quote:
Originally Posted by Augusto
what are you guys using on the threads of SBC head bolts? I have always used RTV because they hit water but for some reason I forgot to use it last time and I put just oil, the engine has not been fired yet but I'm worried about this issue, I will hate me if I have to remove the heads to clean the oil and put RTV on them threads.

Augusto.
I use TPF filled paste plumbers thread sealant on every head bolt and any other bolt that penetrates into areas of coolant or lubricating oil. This stuff has close to the thread lubricating qualities as oil so the OEM torque values can be followed without going off into unknown places.

Bogie
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Old 02-04-2009, 05:21 PM
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I always use Permatex Black. Not an RTV, but a quality thread sealant.

Trees
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Old 02-04-2009, 05:29 PM
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I have been using permatex Teflon paste in a brush plastic can, my zz4 crate engine had the now common g.m. one time torque to yield head bolts (that I replaced on the balance and blueprint,) and they had this sealant on the bolts from the factory,and on the replacement bolt kit as well. I used this on the intake and waterpump bolts that were into liquid or vacuum also. I have had no problems in 2 years with this sealant
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Old 02-04-2009, 05:49 PM
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is there a chance that water would seep out if I don't put any sealer?

Augusto
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Old 02-04-2009, 06:14 PM
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Absolutely!

Quote:
Originally Posted by Augusto
is there a chance that water would seep out if I don't put any sealer?

Augusto
Not only that, but if we are talking about an iron block, it will eventually take out the threads in the block. Sometimes (but not usually) the rotted out threads can be repaired. However, a good sealant prevents all such unhappiness.

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Old 02-04-2009, 06:49 PM
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I just used oil a few years ago when i removed and reinstalled the heads on a 350 i had. I never had any problems with it. It didnt last long before i spun a rod bearing in it, but that had nothing to do with the heads or bolts.
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Old 02-04-2009, 07:54 PM
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they will leak as they are... sealer on the threads that enter the block... lube on the threads or head of the bolt/washer on top....
I had a problem with the teflon thread sealer on the head studs i used, I replaced one fastener at a time and used a permatex thread sealer...
good luck
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