Trunnion bolt question
Team Owner
Joined: May 2001
Posts: 87,367
Likes: 1,593
From: Western NY
I know that the OE bolts that I removed from my heads, when I did the trunnion "upgrade", had some sort of red substance on them, but I don't know if it was for the purpose of sealing something, or as a thread locker. The bolts that came with the kit(s) that I bought, were bare, socket head bolts, and that's how I installed them.
Race Director
Joined: Oct 2004
Posts: 12,864
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It's been awhile since I've looked at an LS1/LS6 head, but iirc, the thread on the intake side does extend into the port. Exhaust won't matter. Also, iirc, I did put a small amount of thread sealer on the threads. I'm sure someone will come on here with a more recent experience than I. Hope this helps.
Team Owner
Joined: May 2001
Posts: 87,367
Likes: 1,593
From: Western NY
This discussion got me curious. After working on my trunnions, and replacing the OE bolts with the ones that came with the CompCams kit, which I initially installed, I kept the OE bolts, and tossed them in my "spare hardware" cabinet. I just went downstairs and took a look at them. I'm kind of surprised at what I found. The OE bolts are formed with a "lip" under the hex head, for lack of a better description. The "sealant", or whatever it is, appears to have been a dap that was applied to the lip, but not the threads.
How this would provide any sealing of the threaded holes, if that was the intention, is beyond me.........
How this would provide any sealing of the threaded holes, if that was the intention, is beyond me.........
Burning Brakes
Joined: Feb 2019
Posts: 1,028
Likes: 377
From: SW Ohio
Many use a small amount if RTV on the threads on the bolts that enter the chamber. I doubt any air enters the runner after they are torqued, but better safe than sorry if the rebuilding books suggest it.
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Team Owner
Joined: May 2001
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From: Western NY
My OE rocker arm bolts.... note, the threads are clean.
Le Mans Master
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Le Mans Master
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From: Florida
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Race Director
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BTW, I don't know if the filter elements of the Z06 and base models are the same or not. Do you know? I'm guessing they are.
Le Mans Master
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Pro
Joined: Apr 2018
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From: Montgomery City, MO
The sealant is to prevent oil from seeping past the threads and into the intake port. Whoever assembled the engine in mine (long before I owned it) omitted this, and the #1 and #8 plugs were badly fouled. When I pulled the intake so I could clean the threads the engine hadn't been running in 12+ hours, but oil was still slowly oozing down the port onto the back of the valves.