Flex plates - all the same or is there a benefit?

[davepl]

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.

[passthebuck]

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

[oneperfectrun]

Originally Posted by passthebuck

My old 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

^^This. If you are not gonna be spinning engine alot of rpm's it won't make any difference which one you choose.
Posted via Mobile Device

[GASoline71]

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

[Lee H]

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

[davepl]

Originally Posted by Lee H

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

Anyone know which one I'd need? My best guess is 471598:

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.