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Bronco cranks? 

 

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Posted: Sat Nov 29, 2008 1:44 pm 
Getting Side Ways
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what exactly is the difference between the 2 cranks and why is the mab crank better?

 

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Posted: Sat Nov 29, 2008 2:07 pm 
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4mab has a higher nodular iron content which make them stronger, and is sought after by performance engine builders. mainly used in 4v clevelands, originally designed/cast for the 71 boss 351 mustangs
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Posted: Sat Nov 29, 2008 2:49 pm 
Smokin em up
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I think also used in Homvees in 1991 Iraq war - when the vehicles were scrapped the cranks were much sought after.

Richie

 

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Posted: Sun Nov 30, 2008 12:55 am 
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Its the Brinell testing mark...
May not necessarily be stronger than normal untested crank..
The high output cranks from 72 where all tested..
& stamped 4MA...

 

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Posted: Sun Nov 30, 2008 11:34 am 
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EBXR is correct....the nodularity of the iron is the same so no crank is stronger than any other.
The Aussie "351" marked cranks are likely better than any of the earlier U.S. cranks due to improved manufacturing processes...of course 4MA and B cranks were also made here before they changed any tooling because the the tooling was shipped as is from the U.S.
It's luck of the draw which cranks appear in Aussie engines but generally a Bronco from the 80's has an ARD 351 crank.
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Posted: Mon Dec 01, 2008 3:21 pm 
Oompa Loompa
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elf100capri wrote:
4mab has a higher nodular iron content which make them stronger, and is sought after by performance engine builders. mainly used in 4v clevelands, originally designed/cast for the 71 boss 351 mustangs


very good advice! ask any crankshaft grinder they will tell you the spark pattern is different with higher iron content....

 

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Posted: Fri Dec 05, 2008 10:57 pm 
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the higher iron content explains the weight the 4ma cranks are heavy as a elephant

 

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Posted: Fri Dec 05, 2008 11:09 pm 
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They all weigh the same because they are all made of the same nodular iron.
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