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post #1 of 10 (permalink) Old 10-29-02, 09:06 PM
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4mab Crank

Hey guys, what's the main differences between the regular aussie 351C cranks and the 4mab? What price do they usually go for?

 
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post #2 of 10 (permalink) Old 10-29-02, 09:29 PM
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These cranks have a high nodular iron content for extra strength. I think they were used mainly in the 4 bolt blocks. As for pricing im not really sure but expect to pay $150 or so more than a stocker, maybe more cos there becoming a little rare.

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post #3 of 10 (permalink) Old 10-29-02, 11:27 PM
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hey can someone explain this:

A little while back I brought a crappy 351 powered Marquis (ZH fairlane). when i rebuilt the motor (2V, 2 bolt, original block) It had a 4MAB crank in it. the rest of the motor and car was stock, so i reckon it was factory. any other fairlanes come with these cranks?

BTW Ive heard the aussie crank is better, and that the 4MAB being better is a fairytale. I look at it this way, when was the last time you snapped a crankshaft ???? save your dough...
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post #4 of 10 (permalink) Old 10-29-02, 11:37 PM
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the 4MAB cranks have actually only been tested to ensure their nodularoty(if there is such a word)

I agree with 73GScoupe .. when was the last time you snapped a crank??
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post #5 of 10 (permalink) Old 10-29-02, 11:41 PM
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When I first got into the drag racing scene I was trying to get a 4MAB or at least a 4MA. As it turns out I couldn't get my hands on one. So I stayed with the 351 crank. Both motors (different cars, one being a 73 GS coupe) have had 351 cranks. No prob's.

To answer your question I doubt Ford would have put a 4MAB crank in not a 351 crank. I'd quess it has been re-built before. If you have it use it, but I wouldn't go out and buy one.

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post #6 of 10 (permalink) Old 10-30-02, 02:09 AM
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My understanding is the 4MA is the american 351 crank while the cranks with '351' cast in are the aussie version.....
It is strange though that i have seen 4ma cranks in a 73 ltd and a 75 ZG fairlane ,both of which i believed to be original ...
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post #7 of 10 (permalink) Old 10-30-02, 02:13 AM
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aussie cranks are as good as the american ones... 4MA or 4MAB ... the 4MAB cranks should have a hardness testing mark on them .. they are really all as good as each other.
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post #8 of 10 (permalink) Old 10-30-02, 02:50 AM
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Re: 4mab Crank

Quote:
Originally posted by xb351
Hey guys, what's the main differences between the regular aussie 351C cranks and the 4mab? What price do they usually go for?
If you are thinking of buying one unless you're gonna do 6000 + rpm's constantly a standard 351 crank is good enough save yourself the extra dough.
 
post #9 of 10 (permalink) Old 10-31-02, 02:53 AM
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Re: Re: 4mab Crank

Quote:
Originally posted by GTHO4
If you are thinking of buying one unless you're gonna do 6000 + rpm's constantly a standard 351 crank is good enough save yourself the extra dough.
even 7000 is OK if properly prepared.... but the emphasis is on proper preparation
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post #10 of 10 (permalink) Old 10-31-02, 06:27 AM
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Quote:
Originally posted by xa-coupe
the 4MAB cranks have actually only been tested to ensure their nodularoty(if there is such a word)

I agree with 73GScoupe .. when was the last time you snapped a crank??
Yes, All 351 cranks are actually the same. All are nodular iron. In fact I know of one particular Pro-stock 351 that regularly sees 9200rpm! The crank?; your basic garden variety ARD351 aussie cast crank.

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