After performing much needed maintenance on my rail (1641+dual port) this winter its running rough as a cob. Rebuilt/rejetted carb, new intake manifold gaskets/boots, new exhaust,new 009 distributer( one advance spring removed), new plugs, along with replacing the gen with an alternator. Won't idle smooth below 1600rpms and one side ie cylinders 3&4 are running hot compared to cylinders 1&2. Valve clearances are .004. I can't find any manifold/exhaust leaks. I have not checked compression yet. Any suggestions guys?

JSWIFT

what carb? got the timing right?

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"IT IS WHAT IT IS"

Yep, timed 15deg btdc on idle/ 32 deg btdc max at high rpms. Carb is a rejetted Solex 34PICT3. New plugs, wires, choke wired open. I don't understand why two cylinders on one side are running hot. I guess its going to come down to a compression check when I can get my guage back.
JSWIFT

Just spitballin, but might have 2 plug wires crossed? Doubt it though.

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15 deg seems way high at idle. I would try maybe putting the other advance spring back in, retiming it to 32 degrees at 3500 and see if it'll drop the timing somewhere between 5 and 10 btdc at idle.

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Want me hold your purse so you can use the skinny pedal like a man?

Triple checked the firing order on the plugs. Yea, the idle timming is high but thats how we run them around here. I'll swap out the distributer with a mild one I have laying around and see what happens.
JSWIFT

.004 is too tight on the valves...set em on a snug .006 and see if that helps

i had similar trouble with my new motor getting hot on one side..could hold your hand on one valve cover and cook a hotdog on the other. once i done the valve geometry and "tuned' the motor, it took care of that problem

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I'm betting it has a vacuum leak somewhere. If it has any valve lash at all thats not the problem. In fact if you are running steel pushrods they should be set at a loose zero. You have already checked the firing order so thats out

Im with Aaron set the valves on zero.

I'm having the condition Reno desribes. I'll recheck for intake leaks and reset my valve clearances which are now at .004-.005. (with steel pushrods) this weekend.

JSWIFT