Hot Rods sbc crankshaft I.D

I just ran across something that is weird. The illustrations that show how to identify a small block chevy crankshaft by the flange end of the crank shaft has me wondering how accurate the illustrations really are. I have what i thought was a small journal 327 by the illustration. Turns out it was a large journal crankshaft. What is going on here? My crank is the center picture, but its a large journal

 

You say yours was thought to be a small journal 327. If it has a road draft tube it may very well be a 283 “cast” crank which is not listed above.

 

Yeah, don't expect 100% accuracy from pictures that are p***ed around on the internet like that. Take it apart and look....

 

It's like the casting number charts. I've found so much misinformation in them that some of them are worthless.

 

Back in the 70's I built a 400 short block with a stock crank for the race car. I had the crank internally balanced. The first problem was the crank flange. Like in the picture, it is larger than the 350 flange that it wouldn't fit in the in and out box. A little t******* with a torch fixed that. The missing metal on the crank flange didn't appear to have any effect on the engine balance.

 

Has the crank been turned at the flange??

I had trouble fitting a large journal crank into the bell on the sprint car years ago and had to turn off some flange . A large jourmal 307 will not fit either ( yea cast crank in a sprint car engine when your poor)

I had a crank balanced once and they removed material off there

Also I think the steel LG 327 crank is different on the flange than the common cast LG 327.

Is your crank forged or cast?
Forged has a wider down the crank.

 

I took it apart and it is a large journal cast crank, not a forged steel like the small journal cranks were.

 

There is also a '67 only 350 steel crank that has a 307 style flange. 2690 forging number. I have one here so I know it does exist. Gene.

 

@bangngears Since you started this and have confirmed what you have now, can you provide a picture and description?

This is a large enough group to be able to do at least as good a job as the picture in the first post.

 

its on an engine stand and back together