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#1 |
Senior Member
![]() Join Date: Sep 2002
Location: Hampstead, NC
Posts: 8,187
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Getting ready to install my engine & trans & I have a flexplate question. I have several flexplates in my stash, however they all appear to be balanced. I say that because they have several extra drilled holes which I am assuming is for balancing.
My question is can I use 1 on the 350 engine I am installing? Seems to me that a balanced flexplate wouldn't do harm to a 350 but visa versa would be a problem (unbalanced on a 400 engine). Any input would be appreciated. We all know what happens when we assume. Thanks Scott
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1963 C10 swb fleetside 1966 GMC G1000 Handi-bus (future project) 1955 Chevy 2 dr. wagon |
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#2 |
At the body shop.
Join Date: Aug 2009
Location: Land of fruits and nuts.
Posts: 5,218
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Re: Can I use a sb400 flexplate on a sb350
No. External balance 400
internal balance 350. The 400 should have a large counter balance weight
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" That didnt make it any newer " " Dont antique the equipment " |
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#3 |
Senior Member
![]() Join Date: Sep 2002
Location: Hampstead, NC
Posts: 8,187
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Re: Can I use a sb400 flexplate on a sb350
Thanks 4 the input. The other flexplates I have do have counter weights, but this 1 only has the extra holes.
Here are a couple pics:
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1963 C10 swb fleetside 1966 GMC G1000 Handi-bus (future project) 1955 Chevy 2 dr. wagon |
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#4 |
Senior Member
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Location: Hampstead, NC
Posts: 8,187
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Re: Can I use a sb400 flexplate on a sb350
ttt
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1963 C10 swb fleetside 1966 GMC G1000 Handi-bus (future project) 1955 Chevy 2 dr. wagon |
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#5 |
Registered User
Join Date: Jun 2010
Location: Anaheim, Calif.
Posts: 361
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Re: Can I use a sb400 flexplate on a sb350
"they have several extra drilled holes which I am assuming is for balancing."
On a flex plate with weights you will actually see a chunk of metal welded on that is the weight. |
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#6 |
At the body shop.
Join Date: Aug 2009
Location: Land of fruits and nuts.
Posts: 5,218
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Re: Can I use a sb400 flexplate on a sb350
I'd buy a new one that hasn't been messed with.
100-2901 bolt kit SCAT Engine Components FP-350-SFI - Scat Flexplates
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" That didnt make it any newer " " Dont antique the equipment " |
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#7 |
Special Order
![]() ![]() Join Date: Nov 2004
Location: Mt Airy, MD
Posts: 85,859
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Re: Can I use a sb400 flexplate on a sb350
I think the holes were drilled to balance the TH350 flexplate. I mean, even with an internally balanced engine you would want the flexplate fairly balanced. The TH400 ones are "counter balanced". No weights = TH350.
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#8 |
Senior Member
![]() Join Date: Sep 2002
Location: Hampstead, NC
Posts: 8,187
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Re: Can I use a sb400 flexplate on a sb350
So, looks like I can use this 1 on a 350/350 combo?
Will probably just go buy a new 1 but would like to know incase I need it in the future. Thanks
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1963 C10 swb fleetside 1966 GMC G1000 Handi-bus (future project) 1955 Chevy 2 dr. wagon |
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