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#1 |
Registered User
Join Date: May 2001
Location: bangor,pa usa
Posts: 29
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396/402bbc- internal/external balance ?
My beautiful machine is out again- rod bearing on #5keeps going.
Rebuilder replaced crank, bearings, rods twice. He said this motor is internally balanced, but others have told me it could be either, and others still have told me all bigblocks were external. rebuilder has no explanation for bearing wipeout. ANY INFO GREATLY APPRECIATED. I want my truck back! ![]()
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72 C10 475HP 402BBC Yes, it's fun, but gas ain't cheap! |
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#2 |
CCRider
Join Date: Feb 2000
Location: Olive Branch,MS,USA
Posts: 2,232
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I thought that 396/427 were internal and 454/502 were external
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72 GMC Sierra SWB almost finished---- 84 Softail Olive Branch MS |
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#3 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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While i don' know about the 502, I have been told that the 454 is the only externial ballanced big block.
Might be time to find a new engine guy. |
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#4 |
Senior Member
Join Date: Jul 2002
Location: Champaign, IL
Posts: 1,397
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Something is funny here...
Maybe the engine builder should be calibrating his equipment. Could it be a bent journal? How about debris in the oil passage blocking flow and starving it of oil? That has to be frustrating. I could be wrong but I thought 454's were the only externally balanced.
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Baby Blue's Build Thread: http://67-72chevytrucks.com/vboard/s...d.php?t=652776 Project 68's Build Thread: http://67-72chevytrucks.com/vboard/s...17#post8442117 www.stonecolumnclassics.com Email: Josh@stonecolumnclassics.com |
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#5 |
Registered User
Join Date: Jun 2002
Location: NW ARKANSAS
Posts: 258
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The smallblock 400 & big block 454 are externally balanced.Not sure about the 502.The crank should interchange between the 396,402,427and I think the 366.Has the block been linebored?(I think thats what they call it)Has the crank been checked for straightness?
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#6 |
Vortec 350's Suck
Join Date: Nov 2000
Location: Pickardville Alberta Canada
Posts: 544
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The only externally balanced BB I know of of is the 454( I think the 502 might be as well, but I don't know). Sounds like a good engine guy to run away from. All the cranks will interchange(366,396,427) and even a 454's can be installed if the block is clearanced and you run the external balanced accessories. Sounds like an incorrectly measured journal or a bad crank, but at any rate find a engine guy that knows something.
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69 Chev CST 10 reg cab lwb Daily Driver: 92 Chev Reg Cab LWB Silverado 4x4, K.I.A 7:51 AM 04/22/03 Will be resurrected |
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#7 |
Registered User
Join Date: Aug 2002
Location: Trenton ,Texas
Posts: 328
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the 454 is the only external motor. i should know, i have one in my 67.......rat
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#8 |
Used to have a truck
Join Date: May 2002
Location: port orchard WA
Posts: 1,552
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400 is
454 is 502 is everything else isnt
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No truck :-( |
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