I just picked up this motor today and am not real familiar with the early stuff. Based on the casting number 1852029-2 and the attached image of the pad stampings can anyone tell me more about this motor? Thanks, Trent

It should have the casting "AAQA" on the driver's side front. "Google" Max Wedge block pictures.

Valve reliefs in the top of the bores as well...

It's NOT a Max Wedge block.
Wrong "Font" engine stampings, on the id pad.
Just a standard 413 hp engine block, nothing special about it.

41 - 413
S - 1962

That's the correct casting number though it's not unique to the MW engine and my info says the block was only notched on the exhaust side.

As for the HP stamp (low compression version), it's either got that or the HPHC (high compression version) stamp as well. With the fonts being different, looks like it could be one.

It does. I have not pulled the heads yet though. Thoughts?

Not sure what your plans are, but don't give up on it until you read the short thread in the truck section titled "413 motorhome engine rebuild."

Real '62 MW. The OP's block is not one.

Another...

FYI
AAQA is not unique to a Max Wedge engine.
Doesn't help much, one way or another in identifying a standard block or Max wedge.

Agree.
NOT Max Wedge.

Yes, notches only on exhaust side of the bores.

The block castings for Max Wedges were also used in other 413 applications, that stamping is typical of a HP street application such as a police car might have. I agree, not a Max Wedge. Bore notches can be added to any block so its a clue not a "clincher".

Thanks for the input guys. As I mentioned, I'm not real familiar with the early stuff and actually bought the motor for a parts donor so no worries about Max Wedge origin either way. I did pull the heads tonight and after looking it over a bit closer it looks like someone rebuilt it years ago and never actually ran it. I'm hopeful I can tear it apart and measure everything and if all goes well, throw it back together and beat on it for awhile although that wasn't my plan when I bought it. I'll probably start soaking things to get it freed up for disassembly this weekend and I'll report back with my findings when I do. Thanks again guys! -Trent

Looks like you scored a nice set of rockers and pushrods in the deal too.

When you work on the engine check the passenger side rocker shaft - rear - in your picture it looks like the soft plug might be missing. There is a black spot that looks like the bolt hole is visible.

Should be one in each end of each shaft. Could also be that the builder hammered them in past the bolt hole too.

What diameter are the exhaust valves? What about head casting numbers?
All the Chrysler 300 motors before 1962 had solid lifters and those type adjustable rocker arms. All the letter series 300 motors had them until 1964 also I think the 1964 300 letter cars used the six bolt valve covers and the later style rocker arm pedestals cast into the heads also
You may have gotten very lucky

No they did not. 1960 and 1961 standard 375 horsepower engines had stamped rocker arms and hydraulic lifters. The optional engines had solids.

It doesn't look like it was run after the last rebuild. Top of the pistons are clean and it looks like new exhaust valves. Score!

I've never seen or heard of any Chrysler 300 Letter cars made before 1962 that didn't come standard with 2x4 barrels carbs and solid lifters, 375 HP or not
Mopar decided to add the non letter 300 cars in 1962 including 4 door hardtops with 383 motors

You never heard of it? OK so that makes it so? "Every human is wrong sometimes" just caught up with cab.

Well look it up, ok I did that for you, read this. Or just read the factory service manual. 375 horse had hydraulic lifters, optional engine shad solid lifters. It's true, and it's OK.

https://www.allpar.com/cars/chrysler/300C/300F.html