I have a 283 block and heads for sale if you need..

A very good friend of mine use to run the 288 cube engine's back in the 70's he was index racing and it was weight per cubic inch .
He ran it in a Vega i will see if i can find some of the pic's and info on his engine he passed away last year . racing was all he lived for .

Year: 1972 / 1973 / 1975 (the last year of pushrod engines)
Location: Indy 500
Mechanic: Smokey Yunick
Engine: SBC 3.875 bore x 2.2 stroke
Induction: Twin Turbo
HP: 1,000 at 6,800RPM - 1,300 at 9,600 RPM
Quote from Smokey: "more mid range torque than I care to talk about"

Correct me if im wrong but I beleive that was a grumpy jenkins combo that required main bearing spacers. I still have a set of spacers new in the box for a 400 chevy block when putting a 327 crankshaft in it!

There are three main bearing sizes, and two rod bearing sizes up to 1986:

400 Main = 2.650 dia
Large Journal - 2.465 dia
Small Journal = 2.300 dia

Rods:
400 and large = 2.100 dia
small = 2.000 dia
(And the newer aftermarket Honda 1.888)

Cool, you are correct on your parts application to put a 262/267/302/305/307/327/350 large journal crank into a 400.

I don't know who started it but i've ran them forever. I have 2 GM 400 blks. 1 in my car 377" and 1 on the engine stand 406". I run the 350 crank mains because it's smaller and less friction VS the 400 mains. Another big advantage is that the bearing spacers have a full grove on the top spacer. I drill an extra hole at 45 degres on the 350 top bearing to get extra oil to the mains. I've done this for over 20 yrs and have never lost a main bearing in a 400 blk.

Zip.

Good info Zip i'll keep that in mind! I originaly had them for a combo we were trying to build if my memory serves me correct i thought we were using a oldsmobile rod with a short skirt piston. wound up scrapin the build when we closed our shop up.