[Fastest65]

I have 7115 forged 396/427 crank. The key way for the
harmonic balancer is 1/4". Where can I find a stepped key
that goes from 1/4" to 1/8" for the balancer? the timing gear
key is good. This crank was on a blower motor and the 1/8"
OE key way was modified to 1/4", now I need to go back to
1/8". I have seen them before. it is just a regular 1/4" that
steps down to 1/8" one piece.
Help.
Thanks

[OHD]

Applied technologies has the step keys, lots easier and stronger to just have the crank gear broached to 1/4

[CNC-Dude]

Your crank formerly being out of a Blown BBC, you need to have it magged! Don't take the sellers word that he had it done or its OK. You might be sending it back to him and getting a refund.....

[OHD]

You know he had that done when it was turned to check straightness and tighten up the clearances then rebalanced for his components..

[CNC-Dude]

Originally Posted by OHD

You know he had that done when it was turned to check straightness and tighten up the clearances then rebalanced for his components..

Have a couple questions...if you smarter than an old guy like me.
Just this second ago (1/2 hour) I bought a Z-16, L-88/ZL-1
5140 std/std crank. Did the tuning ring test on her and it is stamped
"7115". Apparently this is cross-drilled, tuffrided with 7/16" bolts.
Plus this thing has the chamfered oil journels and chamfered mains, rods.
Suppose to use Clevitt chamfered bearings.
Does the 7/16" mean that the main caps have 7/16" bolts? Anything more you
could tell me would be great. This is for my 396 cast #3855962 block
4-bolt. She is a rare one. I was planning on boring out to 4.25" and making
me a 427 with the L-88 solid cam for my 65 Malibu.
Things to look out for in my build etc.. would be great. Plus this crank has been magged. I spent $500 cash. Think I got a great deal since they go for
more twice that much when you can find them. The is one on Ebay right now for $1800.
Anyway your knowledge/experience would be great.
Thanks....

I think he was only emphasizing the crank had been magged prior to his purchase of $500.00! After answering on many of his previous posts in the past, you get a feel for how a person conveys thoughts and expresses himself in speech and text. His statement of "I spent $500 cash", seemed to almost be an afterthought of the fact it had been magged as well as costing him $500.00....Many people will tell you what you want to hear when it comes to selling things, im sure you will agree! Just because the seller said so, and the fact that it was used in a blower application would raise a red flag for me and make me want to confirm that suspicion before I proceeded any farther. He also didn't have the crank rebalanced,from any statements that I read, he at first thought that 7/16" was referring to the main caps! So at that point he would not have known he needed to rebalance. Only later was the difference between the possible weight mismatch of the 7/16" rods and 3/8" rods brought to his attention for consideration....

[OHD]

I have learned to never offer more than 50% of scrap value on anyhting until I measure and test it. NEVER

Honest guys will let you have it magged PRIOR to selling it.

I offer to buy parts and pay for the magging, prior to money changing hands. If they balk, I pass on the "deal"

I magged a "perfect NOS L-88 crank" last month that lit up the mag machine more than any crank I have ever seen.. Seller told the guy "UPS must have damaged it" it was saved my my Dad, who had died 5 years ago, so it had to be good..

With the advent of eBay 10 years or so ago lots of these "gems" are moving from one scrap pile to another, far far away, with lots of money changing hands for these door stops..