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Old 01-03-2005, 03:44   #1 (permalink)
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4 ma b cranks

Hi there guys i finally got all my stuff together to begin my engine build up, - black block clevo, 351 crank and 302 rods, now the crank i pulled out of a spare engine (i got it for virtually nothing so i am not complaining) is a 4 MA B crank, what are they like? Are they ok? My engine will be spinning to about 7000 RPM and will be getting a hard time, everything will be balanced / shotpeened etc i am not taking any short cuts. What are your experiences with these cranks? Thanks in advance guys - Mark
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Old 01-03-2005, 03:52   #2 (permalink)
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Re: 4 ma b cranks

4mab crank is slightly stronger than 4ma crank & can handle 7grand but oiling system will need upgrading to oil the crank at those sort of revs talk to those who know before desaster

cheers pete
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Old 01-03-2005, 04:06   #3 (permalink)
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Re: 4 ma b cranks

Even a stock crank can handle those rpm without issues provided the oils there and your not running n2o. I don't run a 4MA or 4MAB crank. It's had a few modifications though.

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Old 01-03-2005, 04:07   #4 (permalink)
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Re: 4 ma b cranks

I have allways heard that the 4MA or 4MAB crank is better than the standard crank, which has the "351" casting on it. Well i just read an article on a comapany building 500 and more hp clevo's and they acually preferred the std 351 crank over the 4ma. Either way, i think they are both bullet proof for what you are after. The rods will be the weak link of the two. I run the standard "351" cast crank.
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Old 01-03-2005, 05:32   #5 (permalink)
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Re: 4 ma b cranks

I'll give you $20 for it

No seriously.........definitely put it in. Why not if it's supposed to be the strongest of the 3 kinds available. Good deal I say.

Get your crank nitrided too. This makes the surface metal very strong and will hold up high revs much better.
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Old 01-03-2005, 07:04   #6 (permalink)
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Re: 4 ma b cranks

That crank will go to 7 grand easy, i take my 4ma to 7800rpm, the only thing i did as far as oiling goes was get a high volume sump.
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Old 01-03-2005, 16:44   #7 (permalink)
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Thumbs up Re: 4 ma b cranks

Thats awesome guys thanks for that, now i have to send everything away to get cleaned/tested machined, balanced shotpeened etc etc then i have to buy pistons, rings, bearings, gasket set, the list goes on , i can't wait for this puppy to get running, there is going to be some fun had!!!
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Old 01-03-2005, 17:13   #8 (permalink)
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Re: 4 ma b cranks

Quote:
Originally Posted by V8_GRUNT
Thats awesome guys thanks for that, now i have to send everything away to get cleaned/tested machined, balanced shotpeened etc etc then i have to buy pistons, rings, bearings, gasket set, the list goes on , i can't wait for this puppy to get running, there is going to be some fun had!!!
I hope you buy those pistons before its balanced
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Old 01-03-2005, 23:27   #9 (permalink)
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Re: 4 ma b cranks

if you have a spare standard bearing journal crank chuck me a p.m i am starting to collect a few for prepping for racing again.
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Old 01-04-2005, 01:30   #10 (permalink)
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Re: 4 ma b cranks

Quote:
Originally Posted by falcon coupe
That crank will go to 7 grand easy, i take my 4ma to 7800rpm, the only thing i did as far as oiling goes was get a high volume sump.
That's bordering Pro-stock!..........I like it!
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