big block chevy

[resto4u]

Looking at crankshaft engine dampers and some say internal or external balance. What big blocks were internal balance, and what was external balance?

[Lee Stewart]

AFAIK 396s and 427s were internally balanced while the 454s was externally balanced

[scuncio]

Concur....

[Unreal]

You can tell as the externally balanced harmonic balancer has a counterweight cast into the back.

[resto4u]

does anyone have some comparison pics to see the difference?

[Lee Stewart]

http://s26.postimg.org/m956c1m21/download.jpg (http://postimage.org/)


The one on the left is the 454 while the one on the right is the 427

[earntaz]

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

[resto4u]

thanks guys.....

[cook_dw]

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.?...