Bolt tightening pattern for 390 intake?
FTE Leadership Emeritus
Joined: Jul 2002
Posts: 42,561
Likes: 423
From: Long Island USA
My Motor's shows (looking from the front)
5-4
10-7
1-2
8-9
3-6
I would, however, do it in three steps incrementing the torque a little each time.
Bear, I wonder, any way the difference in techniques might contribute or lessen intake gasket failure? (as in, your method being better)
5-4
10-7
1-2
8-9
3-6
I would, however, do it in three steps incrementing the torque a little each time.
Bear, I wonder, any way the difference in techniques might contribute or lessen intake gasket failure? (as in, your method being better)
Post Fiend
Joined: Mar 2004
Posts: 6,056
Likes: 8
From: Union, Washington
My Motor's shows (looking from the front)
5-4
10-7
1-2
8-9
3-6
I would, however, do it in three steps incrementing the torque a little each time.
Bear, I wonder, any way the difference in techniques might contribute or lessen intake gasket failure? (as in, your method being better)
5-4
10-7
1-2
8-9
3-6
I would, however, do it in three steps incrementing the torque a little each time.
Bear, I wonder, any way the difference in techniques might contribute or lessen intake gasket failure? (as in, your method being better)
Senior User
Joined: Feb 2006
Posts: 355
Likes: 1
Most important thing is temporarily stabbing the distributor in before any bolts - just as a locating tool. Next is to start all the bolts before tightening any of them. I usually check for intake flange alignment to the heads and port alignment before putting things together "for keeps". I tend to think that the FE intake is so large and so flexible that either pattern will work.
FTE Leadership Emeritus
Joined: Jul 2002
Posts: 42,561
Likes: 423
From: Long Island USA
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Senior User
Joined: Sep 2007
Posts: 248
Likes: 0
From: Beldenville, WI
Guys, thanks for all the feedback. I asked the question because I am suddenly getting oil in my anti-freeze and figured the intake manifold may simply need tightening, since it's only got 15k on it since installation. I discovered that 6 of the 10 bolts took about an 1/8th turn to seat again. However, after flushing the system the problem still exists. Other than this issue the engine runs just fine with no other symptoms of trouble, and anti-freeze is not getting into the oil. So, I suspect all it needs is new manifold gaskets to solve the problem and not a head gasket...would you agree??
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Cargo Master
Joined: Apr 2004
Posts: 2,574
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From: Golden, CO
I'm gonna say no to the gasket question. There is no pressurized oil at the intake to push it's way into the cooling system. Off with the heads!
I hope it is a gasket leaking because of under tighteneing. Anything after that gets expensive.
I hope it is a gasket leaking because of under tighteneing. Anything after that gets expensive.
Senior User
Joined: Jun 2005
Posts: 126
Likes: 1
I hate to rain on you're parade But..... It sounds like the oil passages in the block have either rusted thru or have cracked. Very very common on FEs. You'll get oil it the coolant but won't get coolant in the oil. There is a fix for this problem. It's not too difficult.
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Senior User
Joined: Sep 2007
Posts: 248
Likes: 0
From: Beldenville, WI
I hate to rain on you're parade But..... It sounds like the oil passages in the block have either rusted thru or have cracked. Very very common on FEs. You'll get oil it the coolant but won't get coolant in the oil. There is a fix for this problem. It's not too difficult.