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Old 11-01-2005, 10:18 AM
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crankshaft interchangeability

Can any of you big block chevy guys tell me if a 396/402 and 427 crank are the same? I know the stroke is the same.

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Old 11-01-2005, 11:06 AM
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Info here.

http://www.mortec.com/

Vince
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Old 11-01-2005, 02:15 PM
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all big block chevys...366-396-402-427-454 use the same bearings , the later model 454's are a diferent piece rear main, but for the most part the answear is yes..a 396 crank will fit a 454 block. 454 crank will fit a 396 block and so on
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Old 11-01-2005, 02:32 PM
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Poor man's 427

My buddy used to put 396 cranks in 454 blocks to make 427's for his drag boat, which he blew up with great regularity. He said the balance was wrong since the 427 pistons were heavier than the 396, but it was good enough. Those were cast crank motors that usually let a rod out of formation around 7200 rpm. Have it balanced it will probably work fine
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Old 11-01-2005, 02:56 PM
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Yep, as was said, balance is the only issue to worry about. Their were many combinations of pistons that were possible with these engines, especially if you include the truck engines. That can make quite a difference in the bobweight.

tom
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Old 11-01-2005, 05:40 PM
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You can use it as most have said but as all that know have said the bob weight is different so have it balanced and it will live longer for sure...


ARP bolts and balanceing are the cheapest form of insurance for any engine...
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Old 11-02-2005, 05:33 AM
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Thanks ya'll I was planning on a new set of rods to go with it and having it balanced professionally. It is a #6223 forged steel unit. Do you think she'll be good to 7000 with some H beams? I also plan on studding it because of 2bolt main.
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Old 11-02-2005, 09:00 AM
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You will be in great shape with the studs and those rods. Back in my drag racing days. I used to shift at 72-7500 every run, with good bolts in 3/8" rods. Never had a rod failure.
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