How can you tell the diff between a 400 SBC crank and a 305-350 sbc crank?????

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MY MOUSE MOTOR EATS MOPARS, FORDS AND EVERY ONCE IN AWHILE... A BIG BLOCK OR 2!!!!
~Bobby

if you have a way to measure the main journals

400 is 2.65"
305/350 are 2.45"
both have 2.10" rod jornals

You can also look up the casting numbers on Mortec.com

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Ray in Bama
78z,355 roller on the sauce!!

[This message has been edited by BIGBADBOWTIE (edited August 11, 2005).]

Also, the obvious- the throw on a 350 is 3.48", on a 400 it's 3.75".

If the crank's out of the block, the 400 crank main journal is larger than the rear main seal journal, and measures 2.650 approx. It also has the front rod pin drilled with a lightening hole (uncommon with 305/350 cranks) and will have a dowel on the flywheel flange.

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Custom Auto, your source for quality machine work, cores and new parts at competetive pricing right here in British Columbia 1-888-563-4050
A Canadian, EH? (with a 10 second street car)

Thanks guys!!!! i will pull the pan and check.
I'm having problems with the Ballancer fitting.

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MY MOUSE MOTOR EATS MOPARS, FORDS AND EVERY ONCE IN AWHILE... A BIG BLOCK OR 2!!!!
~Bobby

400 Crank
http://img.photobucket.com/albums/v306/chevy79/400Crank01.jpg
http://img.photobucket.com/albums/v306/chevy79/400Crank02.jpg

Uhhh, the snout of ALL the Chev small blocks are the same size, (blueprints anyways) what do you have going on?

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Custom Auto, your source for quality machine work, cores and new parts at competetive pricing right here in British Columbia 1-888-563-4050
A Canadian, EH? (with a 10 second street car)

The ballancer is not fitting on all the way.

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MY MOUSE MOTOR EATS MOPARS, FORDS AND EVERY ONCE IN AWHILE... A BIG BLOCK OR 2!!!!
~Bobby

He, He!! It is just flat bigger!!

pdq67