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Gribble123 
Lifetime Member
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1977 L-82 originally white/buckskin interior.
Currently undergoing a frame-off resto. and modifications.YEEHAW!!!
Joined: November 26 2003
Location: WILKES BARRE, PA - USA
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 Topic: Engine rebuild-crank question
Posted: July 29 2010 at 5:08pm |
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Hi folks. First, I want to apologize for not being on here in a while, that is a subject for another thread. For now, I have a question about my engine build.
I'm rebuilding my 350 block, 2 bolt main. I have a few cranks to choose from, all having the same cast numbers. I understand that the 305 and the 350 cranks have the same numbers, with the main differences being in the balance.
My question is...How do you tell the difference? Any input would be appreciated.
Thanks, folks.
Alan
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Adams' Apple
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Moderator
Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/
Am-Fm/map light Multiple NCRS "Top Flight"
#2-1985 Bright Red/Carmine Cp.L-98/auto
Member: NCRS, NCRS Texas, Corvette Legends of Texas
Joined: November 08 2003
Location: Duncanville, TX - USA
Posts: 14013
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Posted: July 30 2010 at 5:16am |
Good to see you back, Alan!  I never realized the cranks had the same cast #, but they certainly do. I don't know for certain how to tell which is which, but I would assume if they were side by side, the difference in the crank throws/counterbalance weights would be noticeable. Strange that GM would cast them with the same #.....
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cthulhu
Lifetime Member
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69 Conv #'s Match 427/390, TKO-600, 3.36 HD Posi, T/T, PS, PB, Leather, Comp Mag 270 & Mag Pro Roller Rockers, Edel Air-Gap RPM, SpeedDemon 750 MS, MSD 6AL+Tach Dist+ Blaster SS+Wires, Holley Blue Fuel Pump, K&N, Jet-Hot Hooker Side-Pipes,Steeroids
Joined: April 24 2004
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Posted: July 30 2010 at 7:19am |
i would imagine they are the same. once it has been balanced it will be different.
I would factor in 2 things. i would look for one that hasnt been balanced and hasnt been turned
since balancing a crank means removing material from the counter weights having more material left to remove is better. ive seen some cranks that looked like swiss cheese in all the work they tried to get a bad crank to balance.
also.. if you find one that only needs to be turned .010 rather than .040 that is preferable.
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nosal1
Gold Member
Vette(s):
1980 Corvette Torch Red with Gold metallic 370HP/350 CU.IN.Turbo 350 w/shift kit.Originally CA.Car with 305 CU.IN.
Joined: March 21 2006
Location: Dunedin, FL - USA
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Posted: July 30 2010 at 8:44am |
Good Afternoon Gribble,
I can possibly help you with the Identification of both 305 and 350 cranks...Firstly the weight of the two are different as the 350 crank is heavier..Another way to ID them is that on the front "throws"lobes, the holes drilled in them are shallow in the 350 and deep holes in the 305,thereby lighter.Hope this helps and if you have any other questions I may be able to help with,please do not hesitate to ask..
Sal C nosal1
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Gribble123
Lifetime Member
Vette(s):
1977 L-82 originally white/buckskin interior.
Currently undergoing a frame-off resto. and modifications.YEEHAW!!!
Joined: November 26 2003
Location: WILKES BARRE, PA - USA
Posts: 615
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Posted: July 30 2010 at 1:44pm |
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Thanks Joel, Ben. Good to be back.
Nosal1, thank you for the info. That is more than I found by searching for it. I will see if that helps.
Thanks guys,
Alan
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ranger3
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Joined: March 20 2004
Location: North Charleston, SC - USA
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Posted: July 31 2010 at 11:02am |
Great question and very informative answers. I learn something everytine I check in. Thanks,
Scott
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C3VR Lifetime Member #114
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Gribble123
Lifetime Member
Vette(s):
1977 L-82 originally white/buckskin interior.
Currently undergoing a frame-off resto. and modifications.YEEHAW!!!
Joined: November 26 2003
Location: WILKES BARRE, PA - USA
Posts: 615
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Posted: August 08 2010 at 8:52pm |
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Hey Ranger-how have you been. We're still driving those POS Impalas in our Dept. We even had Chevy Reps. there to address all the issues we're having with the cars...they were no help.
How's that for customer support?
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lukesvette
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Joined: May 18 2004
Location: HOWELL, NJ - USA
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Posted: August 09 2010 at 3:29am |
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Nothing further I can add here but wanted to say "what's up Alan!!!!"
welcome back!!
Paul
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Veteran of Operation Iraqi Freedeom
101st Airborne(AirAssault!)
God Bless America
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