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Old 03-18-2017, 07:40 PM
resto4u resto4u is offline
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Default big block chevy

Looking at crankshaft engine dampers and some say internal or external balance. What big blocks were internal balance, and what was external balance?
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Old 03-18-2017, 08:13 PM
Lee Stewart Lee Stewart is offline
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AFAIK 396s and 427s were internally balanced while the 454s was externally balanced
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Old 03-18-2017, 09:50 PM
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Concur....
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Old 03-18-2017, 11:15 PM
Unreal Unreal is offline
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You can tell as the externally balanced harmonic balancer has a counterweight cast into the back.
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Old 03-19-2017, 03:11 PM
resto4u resto4u is offline
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does anyone have some comparison pics to see the difference?
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Old 03-19-2017, 03:23 PM
Lee Stewart Lee Stewart is offline
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The one on the left is the 454 while the one on the right is the 427
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Old 03-19-2017, 04:22 PM
earntaz earntaz is online now
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Just to add concerning those pics. The crank on the left appears to be from a late model -- note the one-piece rear main seal. Earlier 454 CAN look just like the crank on the right ... markings and stroke must be verified ... TAZ
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Old 03-20-2017, 10:57 PM
resto4u resto4u is offline
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thanks guys.....
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Old 03-21-2017, 08:02 PM
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Not to question the pics but are you sure that is a 454 crank and not a newer LS crank with a reluctor ring? Maybe you posted the wrong image by accident.?...
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