Aftermarket Cranks

[SSDiv6]

Originally Posted by jmantle

Larry, I thought your post was right on before it disappeared.

I just read the whole stock section in the new 2013 rulebook about a dozen times, didn't want to miss anything. Found the following,

"Any special equipment export kit
(superchargers, dealer-installed options, etc.) automatically
disqualifies car."

That should take care of the group 19 AMC stuff.[/QUOTE]

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...

Originally Posted by jmantle

"Lightening of crankshaft other than normal balance job prohibited."

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

Originally Posted by jmantle

How can turning a 2.437 journal down to 2.200 not be considered lightening the crank?
That's almost 2 lbs.
Jim Mantle U/V/SA 6632

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.