SFI flexplate mandatory in all v8s Jan 2024

[e vassar]

So..is there an expiration date?
I have an SFI flexplate on my car now that I will examine for any cracks etc..but does it make sense to take one off that has never broke,and replace with one that might?

[Pat6868]

Does each and every SFI certified product have to go through the required testing to meet the standards. Asking if someone in the know can answer, thanks.

[Steve Grady]

A representative sample of the actual product is tested. Product is then considered SFI compliant for that part number. Any changes requires retesting.

[Dave Noll]

...

[Duane Eiskant II]

Just internally balance the rotating assembly then no need to modify the SFI flexplate. Hopefully everyone sees me being a smart *** about this.

[Mark Yacavone]

Originally Posted by Duane Eiskant II

Just internally balance the rotating assembly then no need to modify the SFI flexplate. Hopefully everyone sees me being a smart *** about this.

Duane, NOT being a smart*** about this but did you ever see a 301 Pontiac crankshaft?

[Duane Eiskant II]

Mark, Nope haven't seen a 301 crank. Just adding thoughts to NHRA's thinking. Since this is opening a rabbit hole no body wants to go down

[Mark Yacavone]

Originally Posted by Duane Eiskant II

Mark, Nope haven't seen a 301 crank. Just adding thoughts to NHRA's thinking. Since this is opening a rabbit hole no body wants to go down

Okay, neither have a lot of guys here, I suspect.
It only has two opposing counterweights, front and rear.
The flex has a big balance weight on it. I wouldn't want to fool around with that bit of Pontiac engineering ;-)
TCI makes an SFI for the 400, which is the same except they are internally balanced.
This brings us to modifying an approved part. I see that this would have to be re-done every three years too. It's not gonna pass re-cert.

I seem to remember hearing that the perp in the Texas was invited to the barn for a look see. Now supposing one comes apart next year, you can bet it's coming apart too.
If they happen to find a modified SFI unit that failed, who do you suppose is going to have to pay that fine?
There are at least three of those 301 cars out there. These are 6 grand in the lights, max combos. What are they supposed to do ?

As my lawyer would say "arbitrary and capricious"

[nolongerracing]

Originally Posted by Mark Yacavone

Duane, NOT being a smart*** about this but did you ever see a 301 Pontiac crankshaft?

Here's a 301 Pontiac stocker crank internally balanced!

[Steve Grady]

Originally Posted by e vassar

So..is there an expiration date?
I have an SFI flexplate on my car now that I will examine for any cracks etc..but does it make sense to take one off that has never broke,and replace with one that might?

SFI 29.1 Flexplates have a 3 year certification time limit. Some brands will recertify if you send it in to them. Check with manufacturer.