Re[2]: {Chrysler 300} We don't have

The photo clearly shows that 63-64 J/RamK style exhaust headers were used on the '62 405 HP package, with the exhaust heat blocked off (i.e. no heat pipes) so that water heat could be used on the rams. This makes sense because '62 was a short wheelbase car. The 60-61 exhaust headers differed in style, were thicker, and probably just wouldn't fit a short wheelbase 300 (especially driver's side - would not clear steering box or torsion bar). Using the 63-64 headers, why didn't they just use exhaust heat for the rams rather than water heat? Maybe because it sounds like they wanted the ability to "turn the heat off" for racing, and they simply shut off the water flow to the rams.

I found this 'comprehensive article' online. Sounds legit, but may have some errors.
https://over-drive-magazine.com/wp-content/uploads/2023/10/1962-01-HPC-Engines-MOPAR-413-1-6.pdf

On Fri, Jun 20, 2025 at 7:16 AM Bob Merritt <bob@xxxxxxxxxxxxx> wrote:
As far as I can tell,

we don't have much on the 405 horse ram option H.

I came across something that says the H short rams

are shorter than the J short rams. Really?

Short short rams, I've never heard of that.

Other questions come to mind:

Did it have a special cam?

What did they do for exhaust manifolds?

How did they get the 11/1 compression ratio?

If this was a dealer installed option, just how much did

they have to change -- seems like an unreasonably big job.

If you have information, please send it to me so I can

assemble an article.

Bob

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