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Old 06-14-2013, 07:32 AM
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Chevy V8 Crankshaft Flange Outside Diameter

Does anyone have access to a print of a V8 Chevy crankshaft? We're working on a project and I need the OD of the crankshaft flange. Also, How often has this dimension changed? Is an SJ crank flange OD any different than a LJ crankshaft OD, and what about BBC's; 409s and LS motors? I called my favorite engine shop, but hes closed for Fathers Day weekend. I have a 283 crank in the shop, but I can't leave the office for the 90 minute round trip.

Help a brother out?

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Old 06-14-2013, 08:24 AM
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Are you talking about a 1 pice Rear Main Seal crank flange? The 2 pice RMS cranks had a flange that wasnt round is all. This changed for my 1986.

The bolt circle on 1985 and older cranks was 3.58, for the 1986+ 1 piece RMS cranks teh bolt circle is 3"

peace
Hog
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Old 06-14-2013, 09:07 AM
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Quote:
Originally Posted by AutoGear View Post
Does anyone have access to a print of a V8 Chevy crankshaft? We're working on a project and I need the OD of the crankshaft flange. Also, How often has this dimension changed? Is an SJ crank flange OD any different than a LJ crankshaft OD, and what about BBC's; 409s and LS motors? I called my favorite engine shop, but hes closed for Fathers Day weekend. I have a 283 crank in the shop, but I can't leave the office for the 90 minute round trip.

Help a brother out?
I have an old 2 piece RMS 350 crank at the house. If no one answers your question I can measure later today when I get home from work.
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Old 06-14-2013, 10:52 AM
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Essentially; we need to bolt a plate on the back of the engine and need a hole of sufficient diameter to attach the powertrain. Something like a 'block saver' used with a scattershield. So I need the outside diameter of the crank flange. The bolt circle definitely helps; I can throw say 5.5" on the print and just change it later...if I remember LOL
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Old 06-14-2013, 10:20 PM
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Quote:
Originally Posted by AutoGear View Post
Essentially; we need to bolt a plate on the back of the engine and need a hole of sufficient diameter to attach the powertrain. Something like a 'block saver' used with a scattershield. So I need the outside diameter of the crank flange. The bolt circle definitely helps; I can throw say 5.5" on the print and just change it later...if I remember LOL
im no longer at the shop but i have the specs on a white board. its an important number for sprint car engines, i cam get the radius but since its not round, not a diameter.
i do know it depends on what you are working on. a cast 350 crank and a stock forged 350 crank are different. let me know what it is and i should have a crank on the shelf i could measure.
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Old 06-14-2013, 10:35 PM
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GM crank, 2 piece RMS, casting number 3932442...I measured 3.25" from the center of the pilot bearing to the edge of the flange.


From Mortec
3932442..267,305,350..cast...medium journal...3.48" stroke
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