Intake manifold install question
Thread Starter
Drifting
Joined: Apr 2004
Posts: 1,717
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From: North Central Wisconsin & Shitcago
Intake manifold install question
I am installing the correct bolts on the intake manifold on my 67 L79. Should I use anything on the threads such as Lock Tite (if so, red or blue?) or maybe even anti seizing compound?
TIA, Joe
TIA, Joe
Melting Slicks
Joined: Nov 2004
Posts: 2,302
Likes: 26
From: Cave Creek AZ
Originally Posted by Joemac8
I am installing the correct bolts on the intake manifold on my 67 L79. Should I use anything on the threads such as Lock Tite (if so, red or blue?) or maybe even anti seizing compound?
TIA, Joe
TIA, Joe
Roy
Le Mans Master
Joined: Feb 2006
Posts: 6,048
Likes: 5
From: "cutesy" TN
Originally Posted by Joemac8
I am installing the correct bolts on the intake manifold on my 67 L79. Should I use anything on the threads such as Lock Tite (if so, red or blue?) or maybe even anti seizing compound?
TIA, Joe
TIA, Joe
Just my .02
Safety Car
Joined: Mar 2002
Posts: 3,780
Likes: 442
From: Southwest MI
Originally Posted by 67-427ci
Joe: Use a good quality thread sealer.......
i use ARP, but your local parts store will have Permatex.
and don't over torque :-)
Last edited by 66427-450; Oct 2, 2006 at 09:38 PM.
Melting Slicks
Joined: Jul 2000
Posts: 2,097
Likes: 99
From: Boston MA
All the intake manifold bolts, except the 4 corner ones, go into the valley between the heads. Oil will migrate up some of those bolt threads onto the manifold. Usually the 2 per side that straddle the carb. You've seen lots of cars that have little puddles of oil there. You solve that problem by coating the intake manifold bolt threads with thread sealer - that white goop in a tube that plumbers use. The threads need to be clean for this to work. The bolts are new, so those threads are clean. The threads in the heads can be cleaned with a solvent (brake cleaner, lacquer thinner, mineral spirits) and Q-tips.
You don't want Loctite since you want to get the bolts out someday. You don't need anti-seize because those bolts go into an oily place.
Although incorrect, consider putting AN washers under the bolts. All the hot rod stores sell them for htis purpose. They'll keep the bolt heads from marking up the manifold. They're small, so they don't stick out from under the bolt head. You can see them, if you look. But they're not prominent.
You don't want Loctite since you want to get the bolts out someday. You don't need anti-seize because those bolts go into an oily place.
Although incorrect, consider putting AN washers under the bolts. All the hot rod stores sell them for htis purpose. They'll keep the bolt heads from marking up the manifold. They're small, so they don't stick out from under the bolt head. You can see them, if you look. But they're not prominent.
Le Mans Master
Joined: Mar 2005
Posts: 7,631
Likes: 11
From: Rocklin California
Originally Posted by chris ritchie
All the intake manifold bolts, except the 4 corner ones, go into the valley between the heads. Oil will migrate up some of those bolt threads onto the manifold. Usually the 2 per side that straddle the carb. You've seen lots of cars that have little puddles of oil there. You solve that problem by coating the intake manifold bolt threads with thread sealer - that white goop in a tube that plumbers use. The threads need to be clean for this to work. The bolts are new, so those threads are clean. The threads in the heads can be cleaned with a solvent (brake cleaner, lacquer thinner, mineral spirits) and Q-tips.
You don't want Loctite since you want to get the bolts out someday. You don't need anti-seize because those bolts go into an oily place.
Although incorrect, consider putting AN washers under the bolts. All the hot rod stores sell them for htis purpose. They'll keep the bolt heads from marking up the manifold. They're small, so they don't stick out from under the bolt head. You can see them, if you look. But they're not prominent.
You don't want Loctite since you want to get the bolts out someday. You don't need anti-seize because those bolts go into an oily place.
Although incorrect, consider putting AN washers under the bolts. All the hot rod stores sell them for htis purpose. They'll keep the bolt heads from marking up the manifold. They're small, so they don't stick out from under the bolt head. You can see them, if you look. But they're not prominent.
Exactly
Tech Contributor
Joined: Aug 1999
Posts: 14,382
Likes: 6,401
From: At my Bar drinking and wrenching in Lafayette Colorado
Use a little Ultra Black sealant on the threads to keep engine oil in the lifter galley from migrating up the bolts and puddling on your intake - as noted above. Don't use LocTite. Just torque to spec.
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Tech Contributor
Joined: Aug 1999
Posts: 14,382
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From: At my Bar drinking and wrenching in Lafayette Colorado
"AN" washers are a miltary spec washers - it stands for "Army-Navy." They're available through McMaster-Carr, but you don't need them with original bolts - just seal the bolt threads. The AN washers fit a little tighter on the bolt than SAE washers (.406" ID versus .438").
I prefer the Ultra Black for both manifold bolts and head bolts (and the ends of the manifold in place of the gaskets) - it works well, and the bolts are easily removable if you have to pull them back out.
I prefer the Ultra Black for both manifold bolts and head bolts (and the ends of the manifold in place of the gaskets) - it works well, and the bolts are easily removable if you have to pull them back out.
Melting Slicks
Joined: Jul 2000
Posts: 2,097
Likes: 99
From: Boston MA
The AN washers are not for sealing. The thread sealer will do that. The AN washers are to keep the aluminum intake from getting chewed up by the bolts.
They're available at any hot rod store. About $5. McMaster Carr, Fastenal, and Granger would probably have them. Jegs has them -
http://www.jegs.com/webapp/wcs/store...tegoryId=10645
Summit does too.
They're available at any hot rod store. About $5. McMaster Carr, Fastenal, and Granger would probably have them. Jegs has them -
http://www.jegs.com/webapp/wcs/store...tegoryId=10645
Summit does too.
Melting Slicks
Joined: Nov 2004
Posts: 2,302
Likes: 26
From: Cave Creek AZ
with Lars. The correct intake manifold bolts have a round shoulder (like a built-in washer) that keeps it from digging in to the manifold. I used them on my Jerry MacNiesh repaired intake this spring.Roy
