Stroking a 318 to a 390

This project went backwards today.......So i have this crank....

Mopar Performance Heavy Duty Cast Crankshaft

Put crankshaft in last weekend ...did not have a woodruff key on the crank until today....turns ok...but somewhat tighter than i thought it should....so i read the description at mancini racing

Requires Narrow Bearings: No.......

so had used standard FM full groove main being...
today....i got the pistons in....and using CL77 cb481 rod bearing...I put the even side in...no biggie..
move over to the odd side...number one goes in and the engine will not turn....yeah....it needs narrow rod bearing...so i replace all the rod bearing with narrowed bearing...and as each odd side piston is added...it gets harder to turn...
finally after 7 piston are in...i can not turn it over...lol

so i read the description again...lol

these Mopar Performance special heavy-duty crankshafts feature radiused fillets for the small block engines......and knowing it is SCAT i go to Summit and look at cast crank
Requires Narrow Bearings:No......does not mention the radiused fillets .........

to me it looks like it has radiused fillets.....but i getting older by the day......

put big plastic bag on it and went home....

Found this out in the late '90s-LOL. Man was I impatient back then too! Had to wait another week to get the radiused Clevite bearings in. THEN it Plastigage'd a little tight, so I had to wait ANOTHER week for some .001" loose radiused bearings. Used 1/2 standard and the other 1/2 shell loose for perfect clearance. Tore down 10yrs later and they were still mint, cleaned 'em up and they went back in after a deglaze re-ring job. The weaker Eagle cast steel shaft needs 'em too! You CAN scrape the bearings, but to me that's ghetto. I did do it once on a friend's 471 with a 440Source crank, on the mains, since the B engine mains aren't readily available narrowed. Found out when IT bound-up on assembly. Knifed the edges, deburred and it worked fine. Now 440Source offers the bearings relieved by them, I don't think the bearing manufacturers are going to offer them like the Hemi/440 ones you can easily get. Here's an example of the 1/2 and 1/2 bearing trick in action:valiantWheelie.jpg valiantWheelie.jpg