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Old 08-25-2006, 07:24 AM
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Small journal 302 crank into a Gen 1 350 block

Hi, I'm Leonard, (Spitfire02) and my current project is building a bracket car with an Opel GT (already tubbed & tubed) . I'm currently concentrating on building a high-rpm sbc for it! Does anyone know of a source for spacers or thick bearings to put a small-journal crank into a medium-journal block?

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Last edited by spitfire02; 08-25-2006 at 07:42 AM. Reason: clarification
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Old 08-25-2006, 08:18 AM
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Ask you question in the Engine forum and you will get more exposure.
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Old 08-25-2006, 08:28 AM
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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.
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Old 08-25-2006, 09:08 AM
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TRW, or whatever they're called nowdays, makes/made spacers for this conversion. You might want to try them. I have the part# somewhere. If I can find it, I'll let you know.
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Old 08-25-2006, 09:16 AM
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[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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Old 08-25-2006, 09:29 AM
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Why not just make a medium rpm bracket car? According to some, RPM equates to 'ruins peoples motors'.
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Old 08-25-2006, 10:23 AM
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Childs & Albert part number MBS-327-350.

Tech line 661-295-1900.

They ain't cheap.
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Old 08-25-2006, 11:03 AM
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http://airflowresearch.com/articles/...e003/A3-P4.htm
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.
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Old 08-25-2006, 11:31 AM
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Re: Chevy 302

Thanks a bunch, guys. All of your info/comments are appreciated! Leonard.
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Old 08-25-2006, 09:59 PM
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www.raceeng.com has them also.
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Old 08-26-2006, 02:20 AM
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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.
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Old 09-06-2006, 07:39 AM
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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!
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Old 09-06-2006, 04:52 PM
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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.
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Old 09-07-2006, 01:03 AM
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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.
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Old 09-07-2006, 03:44 AM
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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.
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