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Username Post: What is the right or best sealant for lower intake manifold bolts        (Topic#365480)
2000 4x4 GMC 
"6th Year" Gold Supporting Member
Posts: 81
2000 4x4 GMC
Loc: MS
Reg: 03-02-15
06-10-21 12:06 AM - Post#2821426    

After changing cam & lifters 25,000 miles ago, the lower intake manifold is leaking antifreeze. What is the best or correct sealant to use on the bolts that go through to water jackets? Also the best to use on the gaskets & around water jackets on a 2000 454 or 7.4 l? I’ve seen a man on YouTube rebuilding 454 & using a white sealant from GM. Don’t know the name of the sealant but looked like it might work? Really don’t like having to go back and reseal lower intake due to wrong sealant or my mistake. Wouldn’t be to bad if there was more room to work in.



 
rcr3 
Site Ambassador -"17th Year" Silver Supporting Member
Posts: 3475
rcr3
Age: 69
Loc: MANHEIM PA. U.S.A.
Reg: 11-24-02
06-10-21 03:09 AM - Post#2821429    
    In response to 2000 4x4 GMC

That sealant is a Teflon based product, I was a GM parts guy,and we always used it in the shop.

'67 Camaro survivor
'06 Z71 Sierra Ex Cab
'37 Chevy cp.SOLD!!6/7/14
'00 S10 Ex Cab BUILT FOR EVERYDAY,NOT JUST THE HOLIDAYS
'73 Nova pro-street project
'17 Chevy Trax LT







 
2000 4x4 GMC 
"6th Year" Gold Supporting Member
Posts: 81
2000 4x4 GMC
Loc: MS
Reg: 03-02-15
06-10-21 05:17 AM - Post#2821430    
    In response to rcr3

Thank you. I’ll ask the parts man if they have any in stock. The permatex white stuff didn’t hold up long.



 
rcr3 
Site Ambassador -"17th Year" Silver Supporting Member
Posts: 3475
rcr3
Age: 69
Loc: MANHEIM PA. U.S.A.
Reg: 11-24-02
06-11-21 02:53 AM - Post#2821467    
    In response to 2000 4x4 GMC

GM Pt. # 12346004 on an old tube I have.May have superceded by now.


'67 Camaro survivor
'06 Z71 Sierra Ex Cab
'37 Chevy cp.SOLD!!6/7/14
'00 S10 Ex Cab BUILT FOR EVERYDAY,NOT JUST THE HOLIDAYS
'73 Nova pro-street project
'17 Chevy Trax LT







 
2000 4x4 GMC 
"6th Year" Gold Supporting Member
Posts: 81
2000 4x4 GMC
Loc: MS
Reg: 03-02-15
06-11-21 05:08 AM - Post#2821472    
    In response to rcr3

I have a number to go by. Thanks. Have a good day.



 
454cid 
Valued Contributor
Posts: 3209

Age: 48
Loc: West Michigan
Reg: 02-18-12
06-22-21 02:41 PM - Post#2821959    
    In response to 2000 4x4 GMC

I don't believe the lower intake bolts go into the waterjackets. The GM manual gives a part number, and when I looked it up years ago, I was reading that it was blue Loctite..... a thread locker, not a sealant.

My intake didn't take long to leak after paying to have it done, either..... the mechanic used some sort of black goop, and I found the bolt on the front corner backing out. I still haven't fixed it myself, as it mostly leaks to the outside, and I've either been short on time, money, workspace, or needed to drive it.

99 K3500 RCLB


Edited by 454cid on 06-22-21 02:42 PM. Reason for edit: No reason given.

 
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