Exhaust manifold bolts in alum heads?? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

daddybooz · 08-30-2018, 10:36 AM

Guys,

Would like to inquire your thoughts on what to use on manifold bolts into alum heads. The obvious choice is anti-seize but that will vaporize at what +/- 900 degrees? Is a nickle based anti-seize a better choice?

Cant find any info on AC/Delco P/N 5613695 what they use on O2 sensors with glass beads in it?

Getting there, next stop, exhaust and get this finally driving!

Thanks for your input!

cleszkie · 08-30-2018, 12:49 PM

I have always had good performance from the regular Loc-Tite brand anti-seize on steel manifold bolts in my Dart aluminum heads. Have never had a bolt seize or gall. I use the same stuff on my spark plugs with equally good results.

**HO455** · 08-30-2018, 03:24 PM

The regular anti-seize will be fine. If the bolt threads on a N/A small block get to 900 degrees you will have lots more problems than bolts gauling their threads. There are high temperature varieties that would be called for in turbo applications.

Custom 68 · 08-30-2018, 05:32 PM

I have used anti-seize with copper (I believe) with good results. Just what the local parts store carries.
Dave

mike16 · 08-30-2018, 05:36 PM

no bolts. studs only, glue them in and try never to remove them. Coated stainless lubed with bee's wax on installation to avoid galling.

daddybooz · 08-31-2018, 08:32 AM

Thanks for replies. Motor builder says anti-seize will work just fine, guess I was over thinking it!

Jrainman · 08-31-2018, 12:35 PM

I was told a long time ago by some old time engine builders the best thing to use is Malox antacid liquid form yes ant acid you get from CVS /Wallgreens

Ive been using it for years on my cars, trucks and motorcyle exhaust. they built race engines and told me it has a higher heat tolorance then anti-seiz.

I just pulled off my motorcycle exhaust after 5 years that had aluminium heads and stainless studs and nuts and they came off with ease was it malox dono but it still had it on the threads after 5 years.

dirtyjim · 09-02-2018, 11:05 AM

Quote:

Originally Posted by Jrainman

I was told a long time ago by some old time engine builders the best thing to use is Malox antacid liquid form yes ant acid you get from CVS /Wallgreens

Ive been using it for years on my cars, trucks and motorcyle exhaust. they built race engines and told me it has a higher heat tolorance then anti-seiz.

I just pulled off my motorcycle exhaust after 5 years that had aluminium heads and stainless studs and nuts and they came off with ease was it malox dono but it still had it on the threads after 5 years.

yep Maalox or Milk of Magnesia have been used in high heat situations for a long time. put it on the bolt and let it dry then break off the excess

suprachrgd82 · 08-31-2018, 05:46 PM

Quote:

Originally Posted by mike16

no bolts. studs only, glue them in and try never to remove them. Coated stainless lubed with bee's wax on installation to avoid galling.

Yup. Studs with brass nuts. No bolts.

08-30-2018, 10:36 AM	#1
daddybooz Registered User Join Date: Feb 2010 Location: Fort Atkinson, WI Posts: 39	Exhaust manifold bolts in alum heads?? Guys, Would like to inquire your thoughts on what to use on manifold bolts into alum heads. The obvious choice is anti-seize but that will vaporize at what +/- 900 degrees? Is a nickle based anti-seize a better choice? Cant find any info on AC/Delco P/N 5613695 what they use on O2 sensors with glass beads in it? Getting there, next stop, exhaust and get this finally driving! Thanks for your input! Attached Images __________________ DaddyBooz '68 C10 LWB KCP 406; 400 small block, 30 over, alum heads built by Kurt Clapper Ceramic center dumps, custom 2 1/2" SS all the way back w/MagnaFlows 2"/4" drop on 15's

08-30-2018, 12:49 PM	#2
cleszkie Registered User Join Date: Feb 2003 Location: Santa Ana, CA Posts: 2,191	Re: Exhaust manifold bolts in alum heads?? I have always had good performance from the regular Loc-Tite brand anti-seize on steel manifold bolts in my Dart aluminum heads. Have never had a bolt seize or gall. I use the same stuff on my spark plugs with equally good results.

08-30-2018, 03:24 PM	#3
HO455 Post Whore Join Date: Feb 2016 Location: Portland Oregon Posts: 11,409	Re: Exhaust manifold bolts in alum heads?? The regular anti-seize will be fine. If the bolt threads on a N/A small block get to 900 degrees you will have lots more problems than bolts gauling their threads. There are high temperature varieties that would be called for in turbo applications. __________________ Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help. RIP Bob Parks. 1967 Burban (the WMB),1988 S10 Blazer (the Stink10 II),1969 GTO (the Goat), 1970 Javelin, 1952 F2 Ford OHC six 4X4, 29 Model A, 72 Firebird (the DBP Bird). 85 Alfa Romeo If it breaks I didn't want it in the first place The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377

08-30-2018, 05:32 PM	#4
Custom 68 Registered User Join Date: Nov 2001 Location: Springfield, MO Posts: 2,939	Re: Exhaust manifold bolts in alum heads?? I have used anti-seize with copper (I believe) with good results. Just what the local parts store carries. Dave __________________ Dave 1968 Custom Chevy with turbo charged 5.3 gen III 4l80e swap 1967-71 GMC 3/4 ton long step 4x4 (not sure what year exactly?) "A good friend will bail you out of jail...but a true friend will be sitting next to you saying "that was frekin awesome". "If it doesn't fit force it...If it breaks then it needed to be replaced anyway!"

08-30-2018, 05:36 PM	#5
mike16 Registered User Join Date: Dec 2009 Location: bisbee, arizona Posts: 1,530	Re: Exhaust manifold bolts in alum heads?? no bolts. studs only, glue them in and try never to remove them. Coated stainless lubed with bee's wax on installation to avoid galling.

08-31-2018, 08:32 AM	#6
daddybooz Registered User Join Date: Feb 2010 Location: Fort Atkinson, WI Posts: 39	Re: Exhaust manifold bolts in alum heads?? Thanks for replies. Motor builder says anti-seize will work just fine, guess I was over thinking it! __________________ DaddyBooz '68 C10 LWB KCP 406; 400 small block, 30 over, alum heads built by Kurt Clapper Ceramic center dumps, custom 2 1/2" SS all the way back w/MagnaFlows 2"/4" drop on 15's

08-31-2018, 12:35 PM	#7
Jrainman Registered User Join Date: Jul 2015 Location: North East PA Posts: 684	Re: Exhaust manifold bolts in alum heads?? I was told a long time ago by some old time engine builders the best thing to use is Malox antacid liquid form yes ant acid you get from CVS /Wallgreens Ive been using it for years on my cars, trucks and motorcyle exhaust. they built race engines and told me it has a higher heat tolorance then anti-seiz. I just pulled off my motorcycle exhaust after 5 years that had aluminium heads and stainless studs and nuts and they came off with ease was it malox dono but it still had it on the threads after 5 years.



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