SFI flexplate mandatory in all v8s Jan 2024

Paul Precht · 06-16-2023, 11:22 AM

There's a lot of difference between a Mopar flex plate and a GM flex plate. The Mopar is much smaller and lighter, one piece and has no ring gear welded on. I don't think its possible for a Mopar stocker to break a flex plate. They do fatigue and crack around the bolt holes but still don't come apart.

Steve Stasko · 06-16-2023, 12:07 PM

I just bought a couple different Chrysler flexplates. I bought an eBay special that had "Meets SFI standards" or something thereabout engraved/punched into it, and then I bought a PRW from Summit. The latter is about an 1/8th inch thicker, and actually has an SFI sticker on it. The PRW unfortunately does not say anywhere on it or in the instructions of where it is made, but I am assuming overseas.

I'll have to take a pic of the other one and post it tonight, but something about it just made me uneasy, so I bought the PRW. I've never had any issues with a Chrysler flexplate of any kind, and don't intend to start.

06-16-2023, 12:29 PM

My last round in 2019 the flex plate in the Coronet broke completely. Right around where all the bolts were attached. It was a Mopar performance plate that looked like a star. I couldn’t have made another round. Replaced it with a B&M piece. Much nicer and more robust. It definitely broke, probably a few years old and was through a few recerts.

Quote:

Originally Posted by Paul Precht

There's a lot of difference between a Mopar flex plate and a GM flex plate. The Mopar is much smaller and lighter, one piece and has no ring gear welded on. I don't think its possible for a Mopar stocker to break a flex plate. They do fatigue and crack around the bolt holes but still don't come apart.

Greg Reimer 7376 · 06-16-2023, 12:40 PM

Does any body have a brand name/part number, et al for the 14" replacement unit for my 327? I don't mind replacing it while I'm apart right now, just want to be sure I have the right brand and part number.

Paul Precht · 06-16-2023, 02:46 PM

Quote:

Originally Posted by Todd Hoven

My last round in 2019 the flex plate in the Coronet broke completely. Right around where all the bolts were attached. It was a Mopar performance plate that looked like a star. I couldn’t have made another round. Replaced it with a B&M piece. Much nicer and more robust. It definitely broke, probably a few years old and was through a few recerts.

I had that happen on my Cuda back in the mid 70s but it was never a dangerous situation, there's not enough mass, circumference or welded on parts to enable it to come near the danger and damage that a GM flex plate can do.

Hefler · 06-16-2023, 05:09 PM

In the early 2000s in a modified super stock car I had the ring come off of a SFI fleplate just as the car shifted into 2nd gear, it came out from under the car, hit the right wall and then back through my passenger window and into the side of my helmet! It happens really fast to say the least.

06-16-2023, 11:22 AM	#1
Paul Precht Senior Member Join Date: Dec 2001 Location: Elysburg, Pa Posts: 733 Likes: 363 Liked 327 Times in 121 Posts	Re: SFI flexplate mandatory in all v8s Jan 2024 There's a lot of difference between a Mopar flex plate and a GM flex plate. The Mopar is much smaller and lighter, one piece and has no ring gear welded on. I don't think its possible for a Mopar stocker to break a flex plate. They do fatigue and crack around the bolt holes but still don't come apart.

06-16-2023, 12:07 PM	#2
Steve Stasko Member Join Date: Jul 2011 Location: Western PA Posts: 460 Likes: 13 Liked 292 Times in 147 Posts	Re: SFI flexplate mandatory in all v8s Jan 2024 I just bought a couple different Chrysler flexplates. I bought an eBay special that had "Meets SFI standards" or something thereabout engraved/punched into it, and then I bought a PRW from Summit. The latter is about an 1/8th inch thicker, and actually has an SFI sticker on it. The PRW unfortunately does not say anywhere on it or in the instructions of where it is made, but I am assuming overseas. I'll have to take a pic of the other one and post it tonight, but something about it just made me uneasy, so I bought the PRW. I've never had any issues with a Chrysler flexplate of any kind, and don't intend to start.

06-16-2023, 12:40 PM	#4
Greg Reimer 7376 VIP Member Join Date: Nov 2008 Location: Glendora,Calif. Posts: 1,137 Likes: 172 Liked 719 Times in 220 Posts	Re: SFI flexplate mandatory in all v8s Jan 2024 Does any body have a brand name/part number, et al for the 14" replacement unit for my 327? I don't mind replacing it while I'm apart right now, just want to be sure I have the right brand and part number.

06-16-2023, 05:09 PM	#6
Hefler Junior Member Join Date: Aug 2009 Posts: 84 Likes: 3 Liked 4 Times in 3 Posts	Re: SFI flexplate mandatory in all v8s Jan 2024 In the early 2000s in a modified super stock car I had the ring come off of a SFI fleplate just as the car shifted into 2nd gear, it came out from under the car, hit the right wall and then back through my passenger window and into the side of my helmet! It happens really fast to say the least.