s/s legal crankshafts
 

hi,
is there a NHRA approved crankshaft list? The rules seem to be a little bit vague.
thanks,
shawn

Re: s/s legal crankshafts
 

The rules are not vague...the problem is people get too creative. ;)

Nevertheless, this is a link for specifics on SS crankshafts:

http://www.nhra.com/content/sportsma...9848&zoneid=85

Re: s/s legal crankshafts
 

When I bought my Scat the standrard deal had a knife edge. Getting one like it without the knife edge was going to cost another $500.00 because it would be a custom order. Wesley says it is OK to grind the knife edge off, and form a radius like the rule permits. Much cheaper. I wish I had ordered one now, so I could get the small journals and .010" or .013" added stroke. If I have this one reworked I'll likely have more than the cost of a custom shaft.

You might talk to John at Bullett cams. He stopped to visit at Memphis and told me he was doing cranks also. If I had known I would have gone to him first time. I think I read where Woodro used him also. John knows what is and isn't allowed. The price he gave me was $100.00 less than I paid for the one I have. Hindsight, right? :D

Re: s/s legal crankshafts
 

Ed, yes i have been using Johns Cranks ever since he got into the Crank Buisness. Never had problem one!

Re: s/s legal crankshafts
 

Awesome. Thanks guys. SInce I was considering have John do the cam,too, i'll ask him about the cranks. Make it a onestopshop!
thanks,
shawn

Re: s/s legal crankshafts
 

I agree:

Can additional weight, such as heavy mallory, be installed in the counterweights? (YES, BUT only in amounts relative to a "normal balance job". A normal balance job on a Super Stock engine such as a SBC 350 may involve turning down the counterweights to balance up with the "lighter than stock" piston/pin/rod assembly.)

What is considered a "normal balance job"? Is 1 inch off the diameter of the counterweights considered normal to balance a "lighter than stock" piston rod assembly? Or is it 1 1/2 inches? Or 1/2 inch? Which one of these dosen't "look right" in tech? How many holes drilled in the counterweights parallel to the crank centerline are allowed?