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Username Post: Paste, Teflon tape or ? For head bolts        (Topic#374785)
Posts: 37

Reg: 03-03-22
04-02-24 01:43 PM - Post#2868535    

I'm trying to figure out what type of sealent to use on my new head bolts.Some say tape is the best, others say the stuff in a tube or bottle. Some say both tape and liquid. I ran a bolt chaser numerous times, Used both air and vacuum on the bolt holes. I only want to do this once and reading positive and negative on a product is confusing. Can you guys help me.


Valued Contributor
Posts: 3337

Loc: Lake George, NY
Reg: 11-11-15
04-02-24 01:49 PM - Post#2868537    
    In response to Dans55

Why anything unless they go into the water jacket.

Senior Member
Posts: 1075
Loc: Buffalo, NY
Reg: 06-13-06
04-04-24 09:02 AM - Post#2868568    
    In response to Dans55

I'm not an expert, but used loctite brand thread Teflon thread sealer paste about 3/8 " from the end of each bolt, and dipped the tip in oil to torque down the heads.

The block is a '207' cast from an '84 corvette, every head bolt hole was into the water jacket, I checked with a small screwdriver.

'56 Chevy 4dr 210 327ci
'97 GMC K1500 Suburban 6.5TD

"6th Year" Gold Supporting Member
Posts: 4629
Loc: Fairfax, Va
Reg: 12-21-00
04-04-24 02:32 PM - Post#2868575    
    In response to tmsnyder

FWIW, the only thread sealer ARP suggests is their paste, or "a high temperature thread sealer". You don't want to use anything that will have an adverse impact on bolt torque. Hard to imagine that teflon tape would be an issue with torque by why gamble. Tape also runs the risk of a piece coming off and ending up somewhere you don't want it.


If I recall correctly my memory is excellent. My ability to access it is not.

Member #409
Posts: 28112
Loc: Katy, Tx, USA
Reg: 07-06-00
04-04-24 07:17 PM - Post#2868591    
    In response to ss3964spd

Teflon tape is not a sealer, it is a lubricant for pipe threads. You shouldn't use it on head bolts.

Some of the teflon pastes are also lubricant only; others are sealants. Read the label or otherwise check the product out.

Silicone is generally not advised, but it does work. It's also a mess to clean up if you tear down the engine in the future.

Valued Contributor
Posts: 4057

Reg: 04-15-05
04-05-24 02:07 PM - Post#2868610    
    In response to Dans55

Use the goo, not the tape

Super Senior Member
Posts: 6607

Loc: paradise
Reg: 09-05-03
04-07-24 11:56 AM - Post#2868671    
    In response to Dans55

i like thread sealer on all the bolts to get the same torque drag. also put some oil under the head of the bolts. stock head bolts suck, they dont have a good load bearing surface and can damage the top of the hole in the head. adding washers will decrease thread engagement too much.

70 L camino, grampa engine, g-force 5 spd, road rage suspension. Pray first before all else fails.


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