Need some help Scat cranks

[Jb427]

I am having my auto built my builder wants to know the rear crank shaft sizes for converter location and flexplate i am using a scat std wt internal balanced 4340 4.250 crank pn# 4-FE-4250-6700-2200 I can't check mine as my car is running and driving

[Barry_R]

Standard FE 1.850 pilot.

(on the Scat steel cranks you need to remember to put a plug in the back - they are drilled through and that 1.250 hole will let a fair amount of oil out....)

[gdaddy01]

Barry , did you learn that the hard way ?

[Barry_R]

Is there another way?

Dyno adapter plate covers the hole up.  Pre-oils OK - no windage (hole opens to crankcase...).  Fire it up and grab a mop....

[Jb427]

Thanks Barry for that info

[gdaddy01]

thanks for the tip , will save some of us the pain .