Jack L

With the vacuum gauge bouncing around at idle like that, you might want to peruse the info at this link... https://www.motor.com/magazine-summary/mastering-the-basics-reading-a-vacuum-gauge

Manufactures wanted the coil polarity such that the plug would fire from the center electrode to the ground. Later systems , HE, waste spark, etc., had enough "snap" that firing polarity was not a concern. As Sniper stated, there are times when you wouldn't notice it if wire incorrectly.

I was entertaining thoughts of picking up a set of, supposedly, NOS rods. Although the rods I was looking at are identified as 954428, the same as my current set, they are lacking the hole in the small end. A different application? A running change? An earlier, or later configuration? Or, what was referred to in the aircraft engine industry, a "suspected unapproved part" Thanks

51 thru mid 54 331s had the extended block. I know the Dodge and Desoto hemis were smaller blocks than the Chryslers, but am not positive about the block lengths. There's a few Hemi info sites that has any needed particulars. Hotheads comes to mind.

I remember them well, the body started rusting before it was time for spark plugs.

These Chrysler training series are corny, but there's good info n them.

Makes sense, didn't think of that. I'll assume that it's "non-stock".

I'm sure there's someone, or maybe everyone, in the group that knows what the function is of the circled device on the firewall. I don't . thanks

I think that's a Pratt & Whitney 28 cylinder

. The reason for the question was that I have a 25" engine that's a "transplant" in my 50 Windsor and there's no signs that the timing pointer was ever there. The identifying stamping on the block is pretty much obliterated, but was told that it was a truck engine. I've also seen pictures of some engines that appear to have never had it. There's obviously ways of timing it without the pointer, but I was just curious. Thanks. One of the attached is an industrial engine, and the other I'll assume is a military engine, being 24 volt.

I tried searching, to no avail, for any info about which engines used timing chain covers without timing pointers. I'm assuming industrial, and or truck engines? Thanks