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Topic Review (Newest First)
09-10-2006 07:45 AM
CNC BLOCKS NE The main bearings required to put a small lournal crank in a 350 block would be MS-1011H Clevite as we use these bearings in a lot of engines we build using the Honda rod 283 main cranks as we try to get rid of bearing friction and the parts are a lot lighter as well.
09-08-2006 05:59 AM
IanRiordan My road cars have always run large journal cranks purely because I think a high torque/low rpm is right for longevity in a tow vehicle and I need over 350 cubes to move a car and trailer.
I have a T altered as a long term project and it will run a s/j 327 with a 6/71 and rev to the moon.No I haven't heard of a well prepared s/j crank failing either. Maybe some 'engineers' should ignore the claimed power outputs and check the times run prior to 1967 by sbc's under 340 ci and early Hemi's under 400 ci.
Btw, I just bought an 1881 build m73 rifle in 44/40. It now lives with a 1912 m92 in 25/20 (better than a 22hornet to 150 on hares, foxes etc), a 2001 build m70 in 375 H+H and a few Savage m99's.
Happy hunting, be the quarry datsuns or deer.
09-07-2006 11:52 AM
johnnya . Wag :d
09-07-2006 07:47 AM
trees Ian, you know your guns too!! I happen to own a 1963 Model 70 Winchester and it is the most accurate and best shooting gun I own. A member of the USAF rifle team and I were plinking Pararie Dogs years ago at 400+yards and he was missing on occasion and I was having a good day. He asked to try my gun and after 10 in a row, he wanted to buy it. Since it was a Christmas gift from the new bride, it was not for sale. Then he wanted to know who did the trigger work and got a blank stare since I knew nothing about "trigger work" in those days. He went on to say that was the best shooting gun he ever put to his shoulder. 45 years later, I have to agree.

My small journal 63 327 falls into the same nitch, though I do not think it is an exceptional motor as far as small journal 327s are concerned. I think the US Metalurgy was much better years ago than today even though we like to think we know more about it now (The University of Tennessee just started their Metalurgical Engineering Department in 1959 and I was in their first classes). The old time metal craftsmen that migrated to this country may not have been able to tell you why metal propertier were the way they were, but they sure could tell you how to achieve the properties you desired. That is what has been lost in this country since the "engineers" learned the trade from the books.(my opinion). I have not heard of small journal forged steel crank shafts failing and have always been noted for their strength. I think the migration to medium/large journal for higher displacement engines was more of a WAG than educated guess and once started, making them all the same size was more of a ease of manufacturing decision rather than strength/reliability based one.

09-07-2006 03:44 AM
IanRiordan Do some research, I think it was Larry Torres who ran an Opel GT and Larry Kopp who ran a king pin Corvette. Either way they both ran small journal small blocks around 287 cu in and over 11,000 rpm in the 70's.
Small journal means less heat, less weight and more rpm. Yeah maybe the metalurgy wasn't as good then but maybe not, everybody wants a pre '64 Winchester because they are beter finished and SHOOT.
09-07-2006 01:03 AM
327NUT Yes by all means have it checked out by a GOOD crank shop, and have the whole reciprocating assembly balanced if your going to run some high numbers. BUT...there is absolutely nothing wrong with forged small jrnl. cranks. The highest HP (375) small block for years was the '65 327 F.I. Vette, and it was a small jrnl.
09-06-2006 04:52 PM
Small journal crang

Leonard, I would be a little nervous about using a small journaled crank in a high rpm motor JMO and if i did i would have it checked out by a good machine shop. Again,,JMO. Perry.
09-06-2006 07:39 AM
Small journal Chevys

Thanks for all the good info, guys. I found that to put a small journal (rare) crank into a medium journal block(With the 400 being the only large journal sbc) is expensive, whereas the spacers to put a 350 (med. journal) into a 400 block (ie 377) is reasonable. By small journal I refer to 2.30 mains and 2.00 rod journals, by medium, 2.45" mains and 2.10" rods, and for the 400 2.65" mains with 2.10" rod journals. Thanks Again for all the replies!
08-26-2006 02:20 AM
IanRiordan 67 was the only s/j 302. All my68 and later small blocks are large journal - 67 was the last 283, which was replaced in 68 by the 307. Even 68/69 327s (vette only) were l/j.
08-25-2006 09:59 PM
jimfulco has them also.
08-25-2006 11:31 AM
Re: Chevy 302

Thanks a bunch, guys. All of your info/comments are appreciated! Leonard.
08-25-2006 11:03 AM
check this article out,might be helpful.jegs has the 377 c.i. thick bearings under their name for $70 speed-pro $89 i should think they can help you.
08-25-2006 10:23 AM
johnsongrass1 Childs & Albert part number MBS-327-350.

Tech line 661-295-1900.

They ain't cheap.
08-25-2006 09:29 AM
onovakind67 Why not just make a medium rpm bracket car? According to some, RPM equates to 'ruins peoples motors'.
08-25-2006 09:16 AM
53_belair [QUOTE=poncho62]moving it there.................It's my understanding that the 69 302 crank was a large journal crank.......................67-68 may have been different.....which is the same as a 283 crank.[/QUOTE

poncho62 hit the nail on the head, 69 302 crank is large journal. The 69 302 blocks were 4 bolt mains as well.
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