Max Wedge Block?

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

Thanks for the link to read up on the Letter Cars, great reading.

Haven't had much time to get into things yet but I did take a moment to check the heads over briefly. They are casting #2206324 with 2.08 / 1.60 valves. Looks like when they did the valve job they installed new TRW exhaust valves and topped them off with aluminum retainers which don't seem to have a great following from what I've heard. Valve springs were about 140# at 1.750" and about 260# at 1.250". I'll keep you posted as I get into things. Still have the cylinders and lifter bores soaking for disassembly. Fingers crossed it comes apart fairly easily without killing anything.

Also, I did check for plugs in the rocker shafts. They are installed just after the first set of bolts. Good looking out guys.

Springs have serious rust so I would discard them - and the retainers should follow the springs into the garbage can too. I’ve seen a few engines drop valves because the aluminum retainers allowed the locks to pull through.

The heads are very early B heads. I have a set with 1.74” exhaust valves, they are miserable on flow.

So other than the bore notches, is there any "real" difference between a MW block and a 413 out of a New Yorker, or is it like a 440HP, same block, different application?

Kevin

Might be 62 Chrysler 300 Sport.

That is correct.

62 MW blocks, ive seen there are also 2 bosses at the rear of the intake area, look similiar to water pump housing bosses, but of course not open. only HD blocks had those from what im told

I've not seen a lot of original 413 M.W. blocks but I'm going to say none of them used the H.D. industrial blocks to start with
I have used a 413 H.D. block to replace a original 413 passenger car block in a original 1962 Dodge M.W. Dart, the original 413 block in that car(not sure if it was the original proper block or not either) was already bored to 4.240 and it did not sonic test well either
I had the 413 H.D. block bored too 4.250 and had Diamond make a set of reverse domed pistons to make 9.4 to 1 compression ratio so the customer could drive it on the street with CA pump swill back a long time ago in the mid 1990s
I am using a 1972 413 H.D. truck block in my 1963 Fury to mess with some of the local car show expert crowd
I'll tell them a story like I know what I'm talking about
I'm going to tell them it was a rare factory option police pursuit car or something similar, it has a set of 440 Source heads painted the Mopar green and a 4.150 stroke crankshaft with a little over 10.3 to 1 compression so I'm hoping it will make north of 525 HP

LOL!

My story/tech card changes depending on my mood. Sometimes the 505" with ported Stealths is a Poly 318, other times it is a low compression RV 440. The "RAMCHARGER 426" valvecover decals are always played off as B.S.