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Old 11-19-2012, 01:40 PM   #16
jmantle
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Join Date: Feb 2008
Location: Black Creek, BC Canada
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Default Re: Aftermarket Cranks

Quote:
Originally Posted by SSDiv6 View Post
That should take care of the group 19 AMC stuff.
Before the parts were approved for the AMC, similar parts have been approved for Chevy, Ford and Mopar. Such as a Chevy 327 intake on 283 engines; Boss 351 using a Holley in lieu of the Motorcraft carburetor, 4BBL Hemi Nascar engine and more...

It has been going on for years; you can even buy an OEM light crankshaft from Crower for Chevy engines.



How did you calculate the weight loss when you do not have an idea of the material density removed? The crankshaft journal size change was dictated by the NHRA approved rod, the same as other engine makes such as the Oldsmobile small block and Chevy.[/QUOTE]

I fully acknowledge this stuff has been going on for years, just pointing out that some of us don't agree with it, especially in stock.
NHRA could have published separate approved rod lists for stock and SS and kept stock journal sizes in stock, never understood why they didn't.
As far as the weight of the cranks goes, steel weighs .283 lbs per cubic inch, ductile iron a little less depending on the grade.

Jim Mantle U/V/SA 6632
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