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bbc cranks

General engine tech -- Drag Racing to Circle Track

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prairiehotrodder
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bbc cranks

Post by prairiehotrodder » Tue Dec 03, 2019 11:54 am

i have 3 BBC forged cranks that i'm sure are all the 366, 396, 427 variety but they are all a bit different. One is drilled through the front throw, one is not drilled and one is half drilled. One is a 6223 and the other is 622 with the last number missing and one is just 6 and no other numbers. Any help knowing what i have ?
thanks
Brian
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mag2555
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Re: bbc cranks

Post by mag2555 » Tue Dec 03, 2019 12:13 pm

You mean crossdrilled thru the number 1 main, because it sounds like your taking about the rod throw?

prairiehotrodder
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Re: bbc cranks

Post by prairiehotrodder » Tue Dec 03, 2019 12:29 pm

a lightening hole on the rod throw.
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Kevin Johnson
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Re: bbc cranks

Post by Kevin Johnson » Tue Dec 03, 2019 2:09 pm

https://www.mortec.com/cranks.htm

6223 is straight forward.

Best bet is to post up several pics of each one for people to ponder. WAG is that the other two are aftermarket.

Ron Miller
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Re: bbc cranks

Post by Ron Miller » Tue Dec 03, 2019 4:51 pm

All three cranks you have should have different counterweight shapes-profiles. I handpicked two 396-427 steel cranks awhile back. When I got them home, I looked them over side by side. I noticed both cranks had different counterweight shapes and thicknesses. One crank is 2 lbs lighter than the other. I don't really know what the actual application is for each crank. Hell, one might be a tall deck 427 crank. I'm gonna use them in a few 427 builds.
Ron Miller

mag2555
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Re: bbc cranks

Post by mag2555 » Wed Dec 04, 2019 6:56 am

Did the Zl1 427 motors use a non twisted forging unlike all the other motors?

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