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Re: 440 Source Crankshaft journal diameters are very different.
[Re: HardcoreB]
#3211087
02/06/24 11:31 AM
02/06/24 11:31 AM
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Joined: Oct 2005
Posts: 8,871
Ontario, Canada
Stanton
Don't question me!
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Don't question me!
Joined: Oct 2005
Posts: 8,871
Ontario, Canada
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I measured an Ohio and it was pretty consistent FWIW.
I'd say less than .001 difference over all journals is pretty damn consistent !!
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Re: 440 Source Crankshaft journal diameters are very different.
[Re: Stanton]
#3211095
02/06/24 12:36 PM
02/06/24 12:36 PM
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Joined: Aug 2005
Posts: 760
Southington Ct.
turbobitt
super stock
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super stock
Joined: Aug 2005
Posts: 760
Southington Ct.
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From what I hear the crankshaft manufactures are targeting low end of the spec or even slightly below to get the clearance where most performance builders what it. Most shoot for .001" for every inch of journal diameter so in our case .0028" clearance. If the journals where at nominal diameter it would probably be way to tight of a clearance.
Same for rod journals except that chevy journal sizes have a wider selection of under and oversized bearings.
AG.
1970 Challenger w/572 Hemi street car and my pride and joy.
1986 T-Type with 272 Stage 2 Buick V6 engine - True 8 second street car. Just updated the engine and put down 928 HP @ 35# boost to the ground on chasis dyno.
1976 Cee Bee Avenger Jet Boat - 460 Ford powered.
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Re: 440 Source Crankshaft journal diameters are very different.
[Re: turbobitt]
#3211108
02/06/24 01:38 PM
02/06/24 01:38 PM
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Joined: Jan 2003
Posts: 19,363
Las Vegas
Al_Alguire
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 19,363
Las Vegas
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I doubt it will be an issue for what you are doing. AS stated send it back if you feel like it but no guarantee the next one wont be different or "better".
"I am not ashamed to confess I am ignorant of what I do not know."
"It's never wrong to do the right thing"
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Re: 440 Source Crankshaft journal diameters are very different.
[Re: 19_Dart_68]
#3211120
02/06/24 02:22 PM
02/06/24 02:22 PM
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Joined: Jan 2003
Posts: 28,067
Irving, TX
feets
Senior Management
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Senior Management
Joined: Jan 2003
Posts: 28,067
Irving, TX
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If you haven't measured your clearances you haven't found a problem.
We are brothers and sisters doing time on the planet for better or worse. I'll take the better, if you don't mind.
- Stu Harmon
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Re: 440 Source Crankshaft journal diameters are very different.
[Re: HEMI472]
#3211338
02/06/24 11:32 PM
02/06/24 11:32 PM
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Joined: Jun 2022
Posts: 31
Pennsylvania
19_Dart_68
OP
member
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OP
member
Joined: Jun 2022
Posts: 31
Pennsylvania
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So, I was very wrong to be worried...and I am very impressed.
I went back over the crankshaft and re-measured everything. Made very sure I was getting the measurements using the same amount of drag across the journals with the mic...
Main Journal Measurements:
#1 - 2.7493
#2 - 2.7494
#3 - 2.7492
#4 - 2.7493
#5 - 2.7493
only .0002" variance between all journals
I set up my dial bore gauge off of each main journal measurement and came up with the following bearing clearances:
#1 - .0024
#2 - .0024
#3 - .0020
#4 - .0028
#5 - .0028
I'm going to swap the lower bearing halves for 1 and 2 with 4 and 5 and see what happens. Ran out of time tonight.
The issue is me being rusty, not the machine work.
68 Dart - 440 Swap in Progress...please stand by
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Re: 440 Source Crankshaft journal diameters are very different.
[Re: 19_Dart_68]
#3211376
02/07/24 07:48 AM
02/07/24 07:48 AM
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Joined: Aug 2003
Posts: 43,163
Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,163
Bend,OR USA
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Last edited by Cab_Burge; 02/07/24 07:48 AM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: 440 Source Crankshaft journal diameters are very different.
[Re: Cab_Burge]
#3211478
02/07/24 01:15 PM
02/07/24 01:15 PM
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Joined: Jun 2022
Posts: 31
Pennsylvania
19_Dart_68
OP
member
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OP
member
Joined: Jun 2022
Posts: 31
Pennsylvania
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Yes sir! I also verified with a T-gauge and micrometer measurement...That was within .0002" of an inch of the direct measurements with the dial bore gauge...so definitely happy! Hoping to get the mains switched around and re-checked and get the rods done tonight as well. 
68 Dart - 440 Swap in Progress...please stand by
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