Allan, I don't often disagree with your diagnostics but in this case I would make an argument for the exhaust causing the problem rather than an intake valve.
An exhaust valve not opening or one that does stay open for the proper duration will cause a more pronounced popping in the intake manifold than a problem with an intake valve. An engine can have good compression in a cylinder with a non functioning exhaust valve because air can enter through the intake but will pop when the intake opens because the compressed air is still in the cylinder when the valve opens. An intake problem will cause a loss of compression in the cylinder making it less likely to make a sharp popping noise.
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Today's Featured Article - Tractor Profile: Allis-Chalmers WD45 (Gas Version) - by Staff. Beginning production in 1953, the WD45 had the same general look as the WD tractor which was produced earlier - but was much more powerful. This was due to the new 4-cylinder "Power Crater" gasoline engine with a 4 x 4-1/2 inch bore and stroke. Some people feel this was one of the most significant tractors offered by Allis-Chalmers in those days. Nothing in its weight or power class could match its performance. In 1954 they began offering the WD45 with the new "Snap-Coupler&quo
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