CN vs Nak vs Billet crankshaft
#2
Both "CN" and "N" cranks are nodular iron and are the same. A steel billet crank is far stronger and more expensive. For a street-driven car that might see only occasional track use, the nodular is more that adequate.
#4
Can't recall how many we ended up boring the backs for the pilot bushings, probably done a few dozen over my years in business??
Thanks, Gary in N.Y.
P.S. Wishing all here a Happy New Year!
#5
Most Olds cranks are NOT drilled for 4 speed use. The machinist I use charges $150 for the service. If you are concerned about strength then search out a '68 455 crank. Most are forged. Only '68. There is a notch on the rear flange that identifies them for sure. For street use and only occasional track use any factory crank will be fine.
#6
i got another one from him that looks good but I talked to a machine shop we've used for 25 years and a testing lab. Both say they have never heard of 5340 steel so I'm not going to use it for my build. It's probably fine but I'm going to sell it. A member on here has a N ak crank and a CN crank that need turning priced right. I'm very tempted to buy the billet crank though now that I know more about it.
#7
For comparison, the nodular cast iron used in the factory cranks has a tensile yield (depending on the specific nodule size in the casting) of between 47,000 and 95,000 psi and a tensile ultimate of between 67,000 psi and 130.000 psi.
#8
I believe you Joe
but from all the bad things I've heard about this Lynn guy I am not confident it really is what he claims. Is it possible that a crank containing military grade stainless would only cost 600.00? Maybe and very well could so if it is what he says whoever buys it from me is going to get a good deal. Just haven't got around to posting it yet.
#9
but from all the bad things I've heard about this Lynn guy I am not confident it really is what he claims. Is it possible that a crank containing military grade stainless would only cost 600.00? Maybe and very well could so if it is what he says whoever buys it from me is going to get a good deal. Just haven't got around to posting it yet.
#10
It's probably OK for an automatic application
Bet if I looked through the box it came in I'd find some newspaper packing w/Chinese writing on it. I walked past it with an egg roll the other day and I could swear it moved.
It should be fine for an automatic car.
It should be fine for an automatic car.
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