You could turn down the bearing journals on a 350 crankshaft and install it in a small journal 327 block. you would then have the unicorn small journal 350. I built a 327 block with a 283 crank however the 327 block was bored .020. It ran pretty good however I didn't balance it. didn't check the deck height or cc the heads. I didn't last long. spit a rod and what was left of the piston out through the water jacket.
That reminds me If you grind a large journal 350 crank mains down off center and put it in a small journal block and have a stroker. then grind down the rod journals off center and stroke it some more. They managed to get 352 cubes from a 283 back in the late fifties. bet you could get 500 out of a 327 block and 350 offset ground crank?
This is a prime example of those times I cant' tell whether you guys are kiddin or not. Are you? I'm gonna have to take up drinkin.
I'm already drinking. That why that post made no sense. What I would like to know is how much difference is there between a '68 327 and an earlier year. not much as they both way about 465 pounds each bare block 160
Fwiw, a '67, 302 small journal Z-28 forged crank will have a round flange with a notch out of it. The 283 I finally got that was my Nephews has one in it! it started life out as a '66 283.. My old junk301 had a completely round flange and it's crank was out of a '55, 265 P/U engine.. I put it in a worn out early SJ 327 block to make my 301.. The 283 also has a good set of big valve -291 heads to boot!!!!!! The hy-cam is an old TRW TP-142 low lift jobber.. Sucker was so low compressioned that I figure that was why my Nephew ended up with it. Darn thing wouldn't pull a sick whore off the Throne!! It had .039" or so composite headgaskets instead of .020" steel shims and rebuilder .020" cast flat-top pistons that are down in the hole a bit.... Plus the -291 heads cc'ed at 66 cc's!! pdq67
Voh--sorry for the hijack, was not my intent. Finn--Apparently I was talking out my backside, seems the 67 350 crank is referred to as a medium journal crank. There is considerable discussion on a few other sites (ones that are far more anal and knowledgeable about these things then us), but there are a lot of people who do claim the 67 350 is a small journal(mains) engine, at the least they are claiming very early production. Sorry again--Doug
you mean these places...? the HAMB is 1965 -n- older but some of us KNOW all about the years that follow. John Lingenfelter on Modifying Small-Block Chevy Engines: ... https://books.google.com/books?isbn=155788238X John Lingenfelter - 1996 - Technology & Engineering These sizes refer to the main journal diameter. ... Rod journal diameters also vary, although the medium and larger main journal cranks ... SMALL JOURNAL CRANKS Engine Main Journal Diameter 283 C57-'67) 302 ('67 only) ... 327 ('68-'69) 350 C68-'85) 2.45 2.45 2.45 2.45 2.45 2.45 2.45 LARGE JOURNAL CRANKS ... 350 crank in 327 - CamaroZ28.Com Message Board www.camaroz28.com › ... › Classic Engine Tech Jul 1, 2003 - Unless you can find a 67 350 crank; I think those were small journal type. ... (I believe all 350's were medium-journal) .150 and .100 respectively. ... (In fact in 1967 the 350 was sometimes referred to as a "revised stroke 327".) 350 with small journal's??? Page1 - Chevy High Performance Forums ... forums.superchevy.com › ... › Chevrolet Tech › Car Engine Mar 18, 2013 - 12 posts - 5 authors There was only a medium journal 350 crank. 2 piece rear ... The 3.25" stroke lengthswere used on 327s from 1962 thru '67 with small journals. 327 With 350 Crank ? - Hot Rod Forum : Hotrodders Bulletin Board www.hotrodders.com › Tech Help › Engine Mar 16, 2006 - 15 posts - 8 authors A 350 could be made but, the 350 crank, main journals, would have to be turned to small journal specs. Quick reply ... Originally Posted by 67camarokid. Could i buy a ... By 1 and 2 pc. are you referring to the rear main seal? All '55-'86 .... '69 327 crank is a large (or medium size if you will) journal. You need ...
Lots of "I thinks" and "I heard" on the 350 small journal unicorns, but no links to a reputable spec and part number sheet that I could find. Full disclosure: I'm a Ford guy but I admit to having built a couple of small block Chevrolets, and have two in custody now.
Good historical fodder but for all practical purposes even if there were a few factory small journal 350s the chances of coming across one, proving it's heritage (and not a cut down crank), and the benefits are minuscule.
The answer bearing size. A second answer there weren't any small journal 350s Chevy increase the bearing size in the 350 for more journal over lap the same for the 400.
It's really funny how this went from the awesome 283 and 327 to the lay down and died 350, If my comment about the Journal sizes had anything to do with it, I have to say sorry for ruining this thread. Who really care about 350 Chevy's there a dime a dozen.
I have a 1967 283/2brl that came out of a 40,000 mile original C-30 wrecker...block #3896944 date A277...heads#3884520 date A177...suffix code WA...and the rear of the crank looks like the OP's pic...double notch.
That would be a 307 to build a 301 you use a 283 crank in a 327. ^^^^ nothing wrong with a 307 by the way, I personally don't like the bore to stroke ratio but it is a personal thing. Prior to GM coming out with the wheezer 307 motor they didn't have a bad rap at all. The flange on a 283 crank and a 327 crank are the same it is the stroke that is different. Do like Old wolf said and measure your stroke. Although I don't see that your engine size will make any difference unless you just want bragging rights. They both use the same parts, or basically the same parts. Both engines are internal balance so if you are worried about a special flex plate for one or the other or special fly wheel you have no worries.
The Jalopy Journal
