Intake Manifold Bolt Torque - Vintage Mustang Forums
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post #1 of 25 (permalink) Old 05-21-2019, 12:57 PM Thread Starter
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Intake Manifold Bolt Torque

I have had coolant leaks a few times in the past. I have a 351W, AFR 205 heads, Edlebrock intake, ARP stainless Bolts. Previously I torqued the bolts to 17-lbs. The bolts loosen up over time and then it leaks. This time I am changed the gaskets to the steel core 1262s-3. I am going to use Heico-wedge lock washers. I plan to clean the bolt holes out and use Locktite 242. Next is the bolt torque. AFR will not provide any bolt torque. But said the aluminum should be considered for the bolt torque. ARP said the optimum torques for the bolts is 24 Ft-lbs. The ford book says 23-25 ft-lbs. Has anyone torqued the bolt to the ford spec with AFR or other aluminum heads? Alan
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post #2 of 25 (permalink) Old 05-21-2019, 01:38 PM
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I have factory heads and aluminum intake. I have to use the Mr.Gasket 210 to seal up around the water ports. I also add that sticky brown Peratex form-a-gasket with the cap brush on both sides of the gasket at the water ports. Properly lube the ARP bolts and torque all 16 intake bolts down to 22 ft lbs in 5 lb increments and let set over night. Next day you have to re-torque. Works for me, not sure what might change with aluminum heads.

Ford spec of 25 ft lbs is for the cast iron intake.



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post #3 of 25 (permalink) Old 05-21-2019, 02:16 PM
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I use 24 ft lbs on intake bolts. You should also use RTV around the ports and water passages. Most all intake gaskets will relax after the initial install. I usually check and re-tighten the bolts for two or three days to insure they are holding the torque.

John

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post #4 of 25 (permalink) Old 05-21-2019, 02:35 PM Thread Starter
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Fel-Pro says do not use sealant around coolant ports. These are steel core with printoseal for the intake side. My worry is 24 ft lbs is too much torque for Al.
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post #5 of 25 (permalink) Old 05-21-2019, 02:59 PM
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I can't use Fel Pro gaskets as my water ports (on the intake) are too close to the "cut" that they added to their gaskets. The Mr.Gasket 210 gaskets do not have that cut and seal my water ports.
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post #6 of 25 (permalink) Old 05-21-2019, 03:00 PM
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Last time I used one, the Printo-seal is only on one side. The smear of RTV will prevent oil and water leaks because it seals the manifold to the head.

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post #7 of 25 (permalink) Old 05-21-2019, 03:08 PM Thread Starter
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Quote:
Originally Posted by 69GT350H View Post
I can't use Fel Pro gaskets as my water ports (on the intake) are too close to the "cut" that they added to their gaskets. The Mr.Gasket 210 gaskets do not have that cut and seal my water ports.
What bolt torque do you use with your aluminum heads?
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post #8 of 25 (permalink) Old 05-21-2019, 03:23 PM
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Originally Posted by 69GT350H View Post
I have factory heads and aluminum intake. ... Properly lube the ARP bolts and torque all 16 intake bolts down to 22 ft lbs in 5 lb increments and let set over night. Next day you have to re-torque. Works for me, not sure what might change with aluminum heads.

Ford spec of 25 ft lbs is for the cast iron intake.



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I can not find a Ford spec for the aluminum intake, so used the lower end (22 ft lbs) for my use.

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post #9 of 25 (permalink) Old 05-21-2019, 03:27 PM
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I always use sealer on both sides and 20 ft lbs. retorque after a couple of heat cycles.
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post #10 of 25 (permalink) Old 05-21-2019, 03:32 PM
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I had to go around a few times as the gasket compressed. I think I went around almost five times, the last two being mostly just checks.

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post #11 of 25 (permalink) Old 05-21-2019, 04:35 PM Thread Starter
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I always use sealer on both sides and 20 ft lbs. retorque after a couple of heat cycles.
Was this with Alum heads? Funny.... everyone says use sealer around the coolant ports and felpro say not to use it.
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post #12 of 25 (permalink) Old 05-21-2019, 05:42 PM
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Quote:
Originally Posted by 69GT350H View Post
I can't use Fel Pro gaskets as my water ports (on the intake) are too close to the "cut" that they added to their gaskets. The Mr.Gasket 210 gaskets do not have that cut and seal my water ports.
I think that cut is used to vent any seepage to the outside and not into the engine.

John

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post #13 of 25 (permalink) Old 05-21-2019, 05:45 PM
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Quote:
Originally Posted by Alan _MacDougall View Post
Was this with Alum heads? Funny.... everyone says use sealer around the coolant ports and felpro say not to use it.
Yes, I have aluminum heads. Felpro also wants you to use those POS cork pieces in the valley, but most throw those away too.
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post #14 of 25 (permalink) Old 05-21-2019, 05:46 PM
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I think that cut is used to vent any seepage to the outside and not into the engine.
Correct, but my 1969 aluminum intake has corroded a bit and when using the Fel Pro gaskets, it will not stop seeping.


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post #15 of 25 (permalink) Old 05-22-2019, 02:42 AM
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Im running AFR heads and a weiand intake, 20-22 is fine. Let the rtv cure, a good 20 min. Big bead front and back, and another around the jackets. Set the intake in place and let it set up for 20 min, then torque in stages. The other question, did you mill your block? If this is an repeat prob, is your intake flush with your head? I've seen scenarios where the intake is cut at one angle but the head is cut at a different angle causing longstanding problems.
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