Is there any correlation between valve adjustment and...

[zliminator]

the temperature on each exhaust header? As far as I can tell there is. I just went threw adjusting them all. (see http://www.hampleman.com/z-car.htm) I loosened until they started clicking, then tightened until it stopped, then turned them in 1/2 turn. I measured temps and got most around 350 some as low as 300 and 1 or 2 as high as just under 500. I think that's too hot. The engine temp at the sensor (using infared thermometer) is around 170 - 180. As far as I know there are no leaks on the intake manifold. I haven't checked that yet.

 

Dan

[Guest Nic-Rebel450CA]

I may be wrong, but I think the temp that you are getting is going to be more related to the wall thickness of the primary itself. Different spots that you measure at the wall is going to be slightly thinner and will transfer more heat to the surface.

The temp variation is also going to be affected by fuel mixture at the time of combustion. Unless you have a MPFI setup, your cylinders are not going to run equal. I am not sure what temps are too hot, but if you suspect that you are running too hot, then you are probably too lean.

[A. G. Olphart]

Your link didn't work this evening, but assuming you are running hydraulic lifters on a Chevy and did this warm, you should now have a satisfactory street adjustment- good almost forever.

 

To answer your question- I don't know of any correlation as long as the valves are seating and sealing. Generally cylinder to cylinder temperature variations are laid off by the magazines to differences in filling by the carb & manifold. (A good intake manifold has very little variation). Some stock carbs used to be built with little tabs sticking off the outside of the boost venturi to compensate for uneven distribution by the factory manifold.

[hanomon]

If you are running mpfi injection, the hotter exh ports would likely be an indication of lean firing, thus a fouled injector.