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10-14-2017, 05:35 PM
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#1 |
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Senior Member
 
Join Date: Sep 2002
Location: Hampstead, NC
Posts: 8,183
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Can I use a sb400 flexplate on a sb350
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 2008 Corvette convertible |
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10-14-2017, 05:41 PM
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#2 |
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At the body shop.
Join Date: Aug 2009
Location: Land of fruits and nuts.
Posts: 5,128
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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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10-14-2017, 06:29 PM
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#3 |
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Senior Member
Join Date: Sep 2002
Location: Hampstead, NC
Posts: 8,183
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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 2008 Corvette convertible |
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10-14-2017, 11:19 PM
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#4 |
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Senior Member
Join Date: Sep 2002
Location: Hampstead, NC
Posts: 8,183
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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 2008 Corvette convertible |
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10-15-2017, 12:40 AM
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#5 |
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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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10-15-2017, 01:06 AM
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#6 |
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At the body shop.
Join Date: Aug 2009
Location: Land of fruits and nuts.
Posts: 5,128
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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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10-15-2017, 06:51 AM
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#7 |
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Special Order
  
Join Date: Nov 2004
Location: Mt Airy, MD
Posts: 85,862
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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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"BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~ |
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10-15-2017, 03:01 PM
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#8 |
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Senior Member
Join Date: Sep 2002
Location: Hampstead, NC
Posts: 8,183
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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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