428 Cranks
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Joined: Mar 2003
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From: Green Bay Wi
428 Cranks
What is the reason the 428 crank is not a zero balance? Is it due to the wieght of the piston rod and pin?Or is it due to the wieght of the throw itself being that much further away from the center line?
The reason i ask is I'd like to run standard a 390 harmonic.Was thinking Due to the lighter pistons and pins(running 289/302 flatops) I may be able to get this thing to zero or is this a dream?
The reason i ask is I'd like to run standard a 390 harmonic.Was thinking Due to the lighter pistons and pins(running 289/302 flatops) I may be able to get this thing to zero or is this a dream?
Last edited by hotrodfeguy; Jul 17, 2003 at 02:02 PM.
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Joined: Feb 2000
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From: Brea CA
428 Cranks
The damper has nothing to do with the balance unlike the smallblock. The '68 and up 390 and 428 dampers are almost identical and fully interchangeable. When the damper on my 428CJ spun I just scrounged one off a 390, been working fine for 20 years now.
Barry
Barry
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Joined: Mar 2003
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From: Green Bay Wi
428 Cranks
Ok thanks,
Now with the lighter pistons and pins will they be able to lighten the crank?
Those Chev's are going to taste like chicken
Now with the lighter pistons and pins will they be able to lighten the crank?
Those Chev's are going to taste like chicken
Last edited by hotrodfeguy; Jul 17, 2003 at 03:20 PM.
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Joined: Nov 2002
Posts: 315
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From: Clayton CA
428 Cranks
What I've read is that the tolerances are so close with the big 428 crank that there wasn't space for the counterweights on the crank; I don't know enough about it myself to know if this is a valid explanation. The 428 is balanced on the flywheel/flexplate; the 428SCJ also has the "hachet" counterweight to acount for the heavier Lemans rods. I have seen engines listed on Ebay and other places that claim to be zero balance, plus the Scat stroker cranks are zero balance, so I'm sure it can be done.
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