KB crankshaft in stock block?

Has anyone built an engine using the new KB crankshaft in a factory block? If so, how did it work out?
Any issues with fit, balancing, etc?

 

I considered that, but I thought that thread was oriented toward questions for the vendor (KB). I am interested in hearing the experiences of people who have purchased the new crankshaft and used it to build an engine.
Of course, it’s entirely possible that I got that wrong...

 

I own the first off the line crank. I've only seen pictures to date, (Only been a yr) However it will be going in the tomahawk after all the machine work is done. My understanding is all the cranks are made 3.250 mains then the ones that will go in the 3.000 blocks will be cut down. Latest projection for the completion of the short block is within the next few weeks

 

Speak of the Devil, here is that very crank in a stock block... It was the first one thru the door, so the first one used to check the fit on factory and aftermarket blocks.




I did this back early last year, after I received the crank.. Fit is just fine. no problem with clearance anywhere, .005 end play with stock bearings and no mods.

It will take up to a 2200g bobbweight with no heavy metal. With a stroker crank like this, I doubt you will ever get close to that weight, pistons skirts are pretty short in this type of motor.

Rod clerance will be no different than any 4.400 stroke billet crank motor...

Steel rods should clear

Alum rods will require notches in the cylinder bottoms and possibly the pan rail.

While I have not built a complete motor with this new crank, I can't imagine there being any issue that I have not dealt with in the 4.400 stroke billet crank engines of the past. The only thing really "new" about this crank is the pricetag..


JW

 

So did I read this right Jim that it appears with steel rods it doesn't appear there will need to be any clearancing needed on the rails or skirts........??

 

It will depend on which rod you use, For example Molnars have a very nice bolt profile, that does not hit the stock oil pan, on the 470's... but eagle rods on that same engine just barely touch the pan.. big clunky bolt heads on the Eagle rods..

But it would be nothing compared to clearancing for alum rods.

I will update the thread when I build the first iron motor with the new crank.... well, I guess it will be the second iron motor, as the first one will be rather unique

JW