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· under thumb
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288 Posts
There are many stories regarding these stampings and the ones most heard (by me anyhow)

4MA have a certain % of NEW iron when cast ie: 15%

4MAB have more new iron ie: 25% bet I many a time have heard that these are tuftrided from the factory.

And then you have the late 351 cranks out of xd/e black motors that some say are the strongest of them all but really I dont think it matters to much as they're all tough as hell and will handle 500+ hp if preped and ballanced correctly.

No doubt some may say otherwise and I may be way off the mark but after 20yrs of hearing the same stories there must be some truth to it ;)
 

· 351 XE on LPG
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743 Posts
I haven't heard about many 351 cranks breaking, and I've seen heaps of them sing their lovely hi-revving song since 1978 when I wiped my nose, put on my "P" plates and headed down to Ravenswood Raceway for the first time and started paying attention to these wonderful lumps of iron.
 
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