Hi Brian;
I've been beating my own brain trying to recall if the Hudson blocks were "Chrome alloy" or "Chrome-moly". Both sound the same when speaking, but are very different. I found this link, which points to "Chrome alloy". As I understand it, the added chrome gives the block corrosion resistance, but not extra strength. Anyway, this has lots of info on your 308 cu in.; http://wildaboutcarsonline.com/cgi-bin/pub9990262549620.cgi?categoryid=9990481656451&action=viewad&itemid=9990481661744
cheers,
Andrew

Thank you Andrew,
from what I have read the engine block material is harder than cast iron, and I guess the intention was to reduce bore wear by using a harder material. I have read in different places that the block had high Chromium or high Nickel content. I am trying to get a crack repaired and need to provide the repairers with some more specific information.
Best Regards, Brian.

Hi Brian; I forgot to mention that Chrome-moly is Steel alloyed with Chromium and Molybdenum.
The Chromium for corrosion resistance, and Molybdenum for strength.
I checked my 'History of Hudson' book (Don Butler), and could find no more info on the alloy.
I imagine that Hudson didn't want it's competitors to know the 'recipe', and so didn't print much info about it.
Try calling these guys. Sadly Bill passed away a couple years ago, but the shop is still going, and
I'm sure these guys have repaired a block at some point. http://www.albrightcars.com/section/service.htm
-Good luck,
Andrew

[quote="Andrew Pejack" post=19272]Hi Brian;
I've been beating my own brain trying to recall if the Hudson blocks were "Chrome alloy" or "Chrome-moly". Both sound the same when speaking, but are very different. I found this link, which points to "Chrome alloy". As I understand it, the added chrome gives the block corrosion resistance, but not extra strength. Anyway, this has lots of info on your 308 cu in.; http://wildaboutcarsonline.com/cgi-bin/pub9990262549620.cgi?categoryid=9990481656451&action=viewad&itemid=9990481661744
cheers,
Andrew

Great article - addresses a source of questions about the 308 in particular. I copied the material and will put it on the online library, eventually. At least until somebody jumps on my case about it. I couldn't find any way to contact the author of the article.

Hudsonly,
Alex B.

I found this on page 23 of my "Mechanical Procedures" manual, for my '54 Hudson.
ENGINE, GENERAL CONSTRUCTION;
"Crankcase and cylinder block are integral, made of chrome alloy iron to
provide maximum strength with minimum cylinder
wear and weight."
-A

Hi Alex;
I'm off on a tangent here, but couldn't figure out how to send you a message.
I noticed that our library does not include a "Mechanical Procedures Manual" for the Hudson Jet.
There are originals as well as copies ($25 ppd) on ebay. I'd be happy to buy one and
mail it to ? for scanning and posting. I have a hard copy for my own use.
Whaddya think?
-Andrew