Re: exhaust manifold nuts 1928 526 6 cyl

Posted by Owen_Dyneto On 2014/12/27 11:11:04

Torque specifications didn't really begin to arrive until the late 30s. Prior to that what you'll often find comments such as "use a 6 inch wrench and tighten snugly", or similar.

The most important things to remember on exhaust manifolds is that, as Tim points out, exhaust gas pressures are quite low and the manifold expands more than the cylinder block and thus needs to be tight enough to prevent leaks but not so tight it can't "walk" thru the expansion/contraction cycles. I don't use a torque wrench on manifolds but rather do it by feel, if I did I'd think something like 7-10 ft.-lbs would be quite adequate assuming the manifold surfaces are flat and conform well to the block. As to sequence, common sense says to start in the center and work towards the ends but I rather doubt it's all that important.