I was pondering the same. I don't have any suggestions here but I don't think changing spark plugs is the solution here
What is interesting to me is that on a carb setup the four corners are showing fat and the center four are showing lean which I find to be opposite of what most get. Runners on the corners are longer so they tend to get less fuel. This is of course as long as the ignition system is working like it should.
Compression check is good.Have you run compression tests on all the cylinders? Would be really odd for all of the corners to be lower than the centers but it’s worth a check.
That's a valid point, compare the rotational order of the fat cylinders, are they next to each other in order? look for spark skatter inside the cap, check for a crack.What are the odds of the distributor being wonky on one whole side of the motor?
Open.Definitely a distribution issue rather than spark in my opinion.
The possibility of a bad distributor cap causing a weak spark on those cylinders,
I need to look and see what the floor of that intake looks like, is the spacer open or a 4 hole unit?
Definitely a distribution issue rather than spark in my opinion.
open spacer.The issue lies on the 4 corners, not bank to bank.
I second the notion of the carb spacer type, open or 4 hole?
The possibility of a bad distributor cap causing a weak spark on those cylinders,
I need to look and see what the floor of that intake looks like, is the spacer open or a 4 hole unit?
yes years ago, was good then.What were the results and were the cylinders balanced? Have you done a leak down test? Just trying to rule out any mechanical issues.
open spacer.The issue lies on the 4 corners, not bank to bank.
I second the notion of the carb spacer type, open or 4 hole?
So has this problem been there the whole time or is it recent? If it’s recent you may want to do it again.yes years ago, was good then.
I have had the problem the whole time, been on the road for about 5 years. I do not have any complaints as to how it runs, it runs great.So has this problem been there the whole time or is it recent? If it’s recent you may want to do it again.
I was told that is as good as it gets to not have drive ability issues, I am unable to do it myself.Lean it out. That is a tuning issue.
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