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08-28-2012, 07:06 PM
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#1 |
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Registered User
Join Date: Aug 2006
Location: Redmond, WA
Posts: 6,332
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Flex plates - all the same or is there a benefit?
My existing '70 402 flexplate has a couple of chipped teeth and a note from the machine shop that did the engine machining and balancing that says "Bad - Do Not Use", with no other explanation.
So, I figured I'd just order a new one, but I see they range from $35.99 to over $200, even within the same brand (Pioneer, in this case). Granted the really expensive ones are SFI certified which I don't need, but beyond that is there really any difference amongst them? On O'Reily's alone I have six to choose from, not sure what to look for. Thanks! Dave PS: If if matters, I'll be running a TH200-4R behind it with a smaller than stock converter, but I don't think it should matter. The original is your standard neutral-balanced, 14 inch, 168 toother.
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1970 GMC Sierra Grande Custom Camper - Built, not Bought 1969 Pontiac 2+2 427/390 4-speed Coupe 1969 Pontiac 2+2 427/390 4-speed Convertible |
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08-28-2012, 07:16 PM
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#2 |
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Sisyphus was my mentor!
 
Join Date: Sep 2002
Location: Carleton Place, Ontario CANADA
Posts: 984
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Re: Flex plates - all the same or is there a benefit?
My old GM flexplate was messed up & had gone egg-shaped. I replaced it with the cheapest sfi approved one Summit had @ $50ish bucks. As long as it's the proper balance (internal), for your type of crankshaft (2 piece seal) & the right tooth count, they are all the same...
http://www.summitracing.com/search/?...l&Ns=Price|Asc
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passthebuck  #5642 -TWO 1967 GMC 910's. One with L6/3-on-the tree and the other with 355 w/435hp & a 700r4. -a 2013 Honda Civic as my "sensible" car Last edited by passthebuck; 08-28-2012 at 10:49 PM. |
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08-28-2012, 08:08 PM
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#3 | |
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Registered User
Join Date: Aug 2011
Location: Fulton, MS
Posts: 87
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Re: Flex plates - all the same or is there a benefit?
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08-28-2012, 08:20 PM
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#4 | ||||
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"I ain't nobody, dork."
Join Date: Sep 2007
Location: Whidbey Island, Washington
Posts: 8,971
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Re: Flex plates - all the same or is there a benefit?
A lot of the higher priced flexplates have the SFI ratings so they can be used in drag racing and roundy round stuff. If you've just got a stock or warmed over 402... a lower dollar original replacement will be fine.
Gary
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'cuz chicks dig scars... My 1972 GMC 1500 Super Custom (Creeping Death) "long term" build thread. The Rebuild of Creeping Death after the wreck Quote:
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08-28-2012, 10:38 PM
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#5 |
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Registered User
Join Date: Jun 2010
Location: Upland Ca
Posts: 4,147
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Re: Flex plates - all the same or is there a benefit?
Not all the same, go with a GM flex plate or risk starter problems down the road. Just my humble opinion.
Posted via Mobile Device
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1972 C10 SWB, Air, PS, PB, 350/350THM. Second owner. 1965 Corvette roadster, 44K miles, 327/365 SHP, 4 speed, side exhaust, knockoffs, teak, second owner (bought in 1970), Have ALL numbers matching components. My frame off restoration thread: http://67-72chevytrucks.com/vboard/s...d.php?t=556703 |
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08-28-2012, 11:19 PM
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#6 | |
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Registered User
Join Date: Aug 2006
Location: Redmond, WA
Posts: 6,332
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Re: Flex plates - all the same or is there a benefit?
Quote:
Part Number Outside Diameter Year Crank Flange Bolt Pattern Converter Bolt Pattern* Starter Ring Gear Teeth Notes 471598 14" 1970-85 3.58" 10.75", 11.50" 168 For internally balanced engine with two-piece crank seal.
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1970 GMC Sierra Grande Custom Camper - Built, not Bought 1969 Pontiac 2+2 427/390 4-speed Coupe 1969 Pontiac 2+2 427/390 4-speed Convertible |
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