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73-87 Chevy _ GMC Trucks => 73-87 Chevy & GMC Trucks => Topic started by: cwest on April 29, 2014, 05:22:36 pm

Title: What do I torque exhaust manifold bolts to with an alum gasket?
Post by: cwest on April 29, 2014, 05:22:36 pm

I just put new exhaust manifolds on my stock 350.  Per suggestions from the forum I got aluminum gaskets.  The alum gaskets are thicker than normal gaskets and seem to squash down as I torque the manifold bolts.  I assume this is normal, but is there a specific torque spec for those type of gaskets?

Title: Re: What do I torque exhaust manifold bolts to with an alum gasket?
Post by: bake74 on April 29, 2014, 06:00:39 pm

     That is hard to say to an exact amount.  Each manufacture states a little different.  Look through this torque spec sheet from Fel-Pro (http://www.felpro-only.com/tec_notes/Fel-Pro_Torque-Guide.pdf), it should give you a idea.
     I would venture to say that when it starts to compress, then go a little more and you are good.

Title: Re: What do I torque exhaust manifold bolts to with an alum gasket?
Post by: cwest on April 30, 2014, 06:41:36 pm

I couldn't find the specs on Mr Gasket website or anywhere else, so guess I just reasonably tighten them and see how it goes!

Title: Re: What do I torque exhaust manifold bolts to with an alum gasket?
Post by: bake74 on April 30, 2014, 07:19:27 pm

     In our tech section, there is our truck manuals (http://forum.73-87chevytrucks.com/smforum/index.php?topic=25639.0), in your corresponding year of truck it should give you the torque value of the exhaust manifolds.  A generic Chevy engine spec is 25 ft lbs, which I found on the boxwrench (http://boxwrench.net/specs/chevy_sb.htm) site for torque specs for a small block Chevy engine.