i need the part number for the thicker main bearings needed to fit a large journal 327ci crank into the larger 400ci block

please dont ask why im destroking this block. I have most of the parts, and i just want to do it....with what ive got.

I dont know what bearings i need to fit the crank into the block, and i heard that the bearing spacers arent desireable for higher rpm applications....

 

Comp Cams 5620, not thick bearings but bearing spacers.

 

The bearing spacers work fine.

I haven't seen the "special" bearings in years; I haven't seen where anybody bothers with that crap any more. Everybody with any sense, takes the inches, and doesn't spend $$extra money$$ to slow themselves down. Reason being, a new 400 aftermarket crank costs less nowadays than the "special" bearings did.

Kind of like spending $2000 rebuilding a 305 because "it's free"; when for $50, you could have a 350 instead... 15% more power, for virtually free. Problem is, when you wake up from your fantasy dream, you can't go back and fix your mistake any more for $50; it's another $2000. Basically you just flush money down the toilet.

Comp still shows the spacers in their catalog.

 

I asked this for a reason

Although you are correct. Theres NO sacrifice for cubic inches, my application forces me to stay under 6 Liters. If it were a car for the street, i would definately build the 400. But I already Have the crank, and i already have the block, and I already Have my plan.


This Is the information I was looking for. Im not trying to be a dick, an ***, or a *****. Im just trying to make a point.
RB, You are probably one of the most respectable members on this board, I have nothing but respect for you.

 

That is the one circumstance remaining in which it makes sense to do that.... when class rules, or whatever, limit your CID. And as we all know, in the right application, a motor with equal inches but derived from different combinations of bore and stroke, can produce different results.

I'm not trying to be a jerk either; just offering to protect the possibly unsuspecting from the temptation to use their own money as a weapon against themselves, as is so often the case with such a plan.

Those bearing spacers were about $75 last time I checked.