What does everyone think of this 440

[mopar0166]

the numbers are 4-S-75 and below them are 400663-440-4

looks to be a mid to late 70s 440  rb

[bull]

I'm not as excited about these engines as I am the older ones but they're still a lot of fun.

[Musicman]

4006630 is the casting number for a 1975-1978, 440 block... Like any 440, it's a good block 

Mid 70's and later castings were made of a "slightly" weaker metal than their earlier counterparts, but they make up for it with heavier walls and stronger support ribbing so it's a wash... ones is as good as the other. Personally, I'll take one of the later 70's blocks over an earlier casting any day of the week... but others would argue that the early castings are a better choice.

Either way... no worries, it's a good block

[daves68]

After comparing the numbers to mine,I think your casting date code is probably 4-6- or 4-8- 75.  The 440 denotes size and the 4 has something to do with the mold for the casting cores and core shift.  I've heard that lower numbers are better but my "10" ( 4006630-440-10   11-15-74) cleaned up fine.
Dave

[mopar0166]

thanks for all the great info! Im going to go and look it over this weekend.  But for now Ill continue to run my small block. 


thanks everyone!

[Chatt69chgr]

Read the nice article on the 440Source website about blocks.  The 4006630 block as stated was the last run of 440 blocks.  They were produced in mid 1975 model year and ran until end of production.  According to what I have read, the nickel content of these was a little less than earlier blocks and so are not quite as hard by maybe 10% which means they could possibly wear a little faster in the bores than the earlier ones did.  They do have the figure 8 water passages leading to the heads which some think provide for better cooling and they have the improved engine mounting lower ear that has a nasty habit of breaking off on the earlier blocks (usually on the passenger side).  Some Chrysler literature said that these were thin wall blocks that could only be bored 20 thousandths.  That is a bunch of bull.  There were never any such things as thin wall castings.  Any wall in any block could potentially be thin wall.  It all depends on how much core shift, if any, happened during casting.  You can only find this out by having the walls sonic tested.  Folks that are only going 30 over don't ususally worry about this.  As you get increasingly larger up towards 55 and 60 over, it's probably a good idea to get the block sonic checked.  Otherwise, these are good blocks and will make fine engines for your Charger.  Also note that some of these blocks had larger bottom end castings which is also detailed in the 440source article.  I think they call them superblocks.  That couldn't hurt if you had one of those but for a regular street engine it really shouldn't matter.