SFI flexplate mandatory in all v8s Jan 2024

[Mark Yacavone]

Originally Posted by Chevy55

2023 NHRA RULE AMENDMENTS

Beginning January 1, 2024, SFI 29.1 flexplate mandatory on all V-8 vehicles. Any car running quicker than 9.99, SFI 29.1 automatic transmission flexplate and SFI 30.1 flexplate shield mandatory. See General Regulations 2:12, 2:14.

Yes..Okay.
So how does that apply to U/SA 273 Mopars?

[joe huestis]

Originally Posted by Mark Yacavone

Yes..Okay.
So how does that apply to U/SA 273 Mopars?

or to a 267 chevy U/SA ?

[Paul Precht]

A Mopar flex plate barely extends a 1/2" beyond the bolt circle of the converter, if it explodes it's because the converter exploded otherwise not really possible.

[Mark Yacavone]

Billy , Just mark your tech card with the ATI 400 Pontiac model.
If anyone asks , I'll say I saw you put it in .
I'm sure you will anyway..it's only a deuce , plus re-balancing
Still not sure if you can add or take away weight on an SFI approved flex.
Anybody?

[Bob Bender]

I have always used a SFI wheel. Just thought it was a good idea.

[L.Fite]

Originally Posted by Mark Yacavone

Billy , Just mark your tech card with the ATI 400 Pontiac model.
If anyone asks , I'll say I saw you put it in .
I'm sure you will anyway..it's only a deuce , plus re-balancing
Still not sure if you can add or take away weight on an SFI approved flex.
Anybody?

You CAN...
I have in the past... (removed weight for balance)
Honestly never gave it a thought, just part of building a motor...
Will it recertify?
Don't know...
THAT is the true question...
Hmm...

[Billy Nees]

Originally Posted by L.Fite

You CAN...
I have in the past... (removed weight for balance)
Honestly never gave it a thought, just part of building a motor...
Will it recertify?
Don't know...
THAT is the true question...
Hmm...

Soooooooooooooo, "You CAN..." but can you LEGALLY?

[L.Fite]

Originally Posted by Billy Nees

Soooooooooooooo, "You CAN..." but can you LEGALLY?

Exactly!

Again, never gave it a thought, just SOP...?
I've been running SFI flexplate since it became a rule way back when.
Have always balanced according to what was needed building a motor.
Also recall having to drill the converter bolt holes to fit the converter bolts?

I can't remember anyone at any time crawling under a car to check if it was even there. Much less if it had any extra holes...

Always ran cars fast enough to require one, so always had one.
I've never seen a flexplate fail like that, (and due to the reaction I don't think it has been a particular problem) although I once saw a stock one spit the balance weight off... that alone will get your attention.

It will be something a lot of people will have to deal with in the off season, not too big a pain really just something else to put on the to do list over the off season freshen up.

[Billy Nees]

Originally Posted by Mark Yacavone

Still not sure if you can add or take away weight on an SFI approved flex.
Anybody?

From what I got out f this conversation, you can't.