440's that were scrapped becausr of myths!

[Chryco69]

I wonder how many 440s were scrapped because of the thin wall myth? Hmmmmmmm......

 

[68GTX4SPEED]

32

 

[Richard Cranium]

Not to sound ignant, but am I the only one wondering what the thin myth is?

 

[wedge69]

the bore walls are thought to be to thin .

 

[Chryco69]

32? That's all?

 

[440+6]

I think he is talking about the early blocks that didn't have the thick reinforcement ridge on the outside of the casting

 

[Propwash]

32

Really? I heard 56, but that might have been just in Vermont and Nebraska alone.




No clue, sounds like a waste though.

 

[kiwigtx]

Really? I heard 56, but that might have been just in Vermont and Nebraska alone.




No clue, sounds like a waste though.

I heard it was more like 58 ...fairly reliable source.

 

[Propwash]

I heard it was more like 58 ...fairly reliable source.

LOL.. Always pays to know the right folks.

 

[kellycom]

Not to sound ignant, but am I the only one wondering what the thin myth is?

I thought this was about Thin Mints. yum!!!!

 

[Budnicks]

I highly doubt very many were scraped because of it, unless over-bored, but there are better castings than each other too {440 source had a really good write up on the debate}, but core shift is the biggest problem, especially on the trust/outside of the cylinder walls in direction of rotation, if you have a hi-rpm/hi-hp & especially Blown combo, a sonic test will & is still be a great idea, 99% of the time it's the webbing support by the mains that cracks in RB 413-426w-440's, not so much in 350-361-383-400 low-decks B-series because of the smaller main journal diameters & not the cylinder walls "usually", but some core shifted blocks do have one side thinner in the block than others, but you can always sleeve them too, try to get a block if your making big power especially, that has little to no core shift {A Monday block, instead of a Friday after break-time block, so to speak, when the plug for casting has pretty much gone thru it's life cycle} if you think the sonic test shows that they are too thin, in the middle upper section of the cylinder on the thrust side, but it's mainly related to big boost &/or big N20 hits...

not really a myth if you bore it too far & it cracks under a hard load or hi-rpm

 

[Cranky]

Chrysler was supposed to go to thin wall casting in the early 70's but never really did. All blocks were supposed to be limited to a .040 over bore because of the thin wall casting technique but it was actually more expensive to make sure the molds were on the money to do this (no core shift or minimal shift) and the costs didn't offset the savings in materials. Core shift was a problem due to lousy quality control but mom's blocks were usually cast of high quality cast iron and the 'mix' was always good. If you've ever hung around an automotive machine shop, you can hear the way the cutters sound when boring a GM vs Ford vs Chrysler. GM was usually quiet (ie soft material) and Ford was usually the loudest but wasn't always a consistent sound even in the same block. Chrysler was usually in the middle of both but the cutter made a consistent sound during the cut. Anyone that has machined a good amount of cast iron can attest to the sounds. The harder the cast iran, the louder the sound.....and damn, iran is still around.

 

[Deleted member 214]

42... simultaneously.

 

[Meep-Meep]

42... simultaneously.

Ha! I was going to say 42 because it's the answer to the ultimate question.

 

[kiwigtx]

Not to sound ignant, but am I the only one wondering what the thin myth is?

Something like this RC....

...unlike Cranky's post pre-Mod status

 

[Cranky]

Something like this RC....

...unlike Cranky's post pre-Mod status

LOL Not sure what one is worse lol

 

[Richard Cranium]

Someone please give that woman a sammich or 10!

 

[Chryco69]

http://440source.com/blockinfo.htm

 

[Deleted member 214]

Ha! I was going to say 42 because it's the answer to the ultimate question.

Another Hitchhiker fan, I see...