351M intake install tips
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351M intake install tips
Just got a aluminum intake for my 351 and was wondering if I need to buy a new Valley pan gasket or are they reusable? Also should I just use silicone for the ends or use the rubber gaskets? Any other tips are appreciated thanks
Fleet Owner
Joined: Dec 2009
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From: NorCal
But I'd just use RTV on the ends... ya might wannaa dimple the end rails so the RTV have some "feet" to grab onto unlike a straight smooth surface.
When applying the RTV, it's not a straight bead.. rather it's daub-lift-daub-lift.... try to make it look like a string of nice TIG welds. Wait for about 10 minutes for it to skin over and then place the manifold straight down. It doesn't hurt to pre-fit the intake to determine how tall the RTV has to be.
Have fun!
Cargo Master
Joined: Apr 2010
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From: Billings, MT
Ditch the leak-prone valley pan. They usually don't seal well with aftermarket intakes.
Use the paper gaskets from Mr. Gasket or Fel-pro and silicone on the end rails, make sure to overlap the gasket a little and use the torque sequence!
The inner bolts will loosen as you tighten others so keep repeating the pattern until they all stay snug.
Use the paper gaskets from Mr. Gasket or Fel-pro and silicone on the end rails, make sure to overlap the gasket a little and use the torque sequence!
The inner bolts will loosen as you tighten others so keep repeating the pattern until they all stay snug.
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From: S/W Missouri, Polk county
Permatex Ultra Copper Max temp IMO...
Permatex Ultra Copper Maximum Temperature RTV Silicone Gasket Maker (3 oz) - Permatex 81878 | FCP Euro
Permatex Ultra Copper Maximum Temperature RTV Silicone Gasket Maker (3 oz) - Permatex 81878 | FCP Euro
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Fleet Owner
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From: NorCal
Below is an example of dimpled China walls. A broad punch and hammer gets the job done. You can also go the extra mile and dimple the underside of the intake too.
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thanks for the picture I will make sure to do this
Postmaster
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From: Taxachusetts
Those cake pans should not be re-used if you want a good seal.
Pre- bend the pan a bit and test fit on the block and check how the intake fits. Hopefully, you still have those little nubbies on each head - they help hold the pan in place while fitting the intake if you don't bend it.
Silicon/RTV the china walls and up the sides a bit first....while that's "breathing" or tacking over, RTV both sides of the pan, around every opening with a light layer. A thicker layer should go on the pan's top "S" ends and up the sides a bit.
Install intake and torque to specs/sequence.
Pre- bend the pan a bit and test fit on the block and check how the intake fits. Hopefully, you still have those little nubbies on each head - they help hold the pan in place while fitting the intake if you don't bend it.
Silicon/RTV the china walls and up the sides a bit first....while that's "breathing" or tacking over, RTV both sides of the pan, around every opening with a light layer. A thicker layer should go on the pan's top "S" ends and up the sides a bit.
Install intake and torque to specs/sequence.
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Those cake pans should not be re-used if you want a good seal. Pre- bend the pan a bit and test fit on the block and check how the intake fits. Hopefully, you still have those little nubbies on each head - they help hold the pan in place while fitting the intake if you don't bend it. Silicon/RTV the china walls and up the sides a bit first....while that's "breathing" or tacking over, RTV both sides of the pan, around every opening with a light layer. A thicker layer should go on the pan's top "S" ends and up the sides a bit. Install intake and torque to specs/sequence.
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