Let's talk 318/349/390 strokers.

a 4 inch crank will fit the bottom end of a sbm with no mods...

it is your choice of rods that mades the difference....

scat i beam or eagle i beams require no grinding....

a h beam or stock rod will require MINOR grinding for the rod bolt to clear the bottom of the cylinder wall...

if you are buying new rods ....buy the scat 4340 I beam rods..

oil pans clear.....and pickup clear ...