Author Topic: C6 flex plate what to get  (Read 1536 times)

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Jb427

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C6 flex plate what to get
« on: January 22, 2022, 08:32:15 AM »
What is a good flexplate for a c6 fe 600 to 700 hp rating?

KMcCullah

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Re: C6 flex plate what to get
« Reply #1 on: January 22, 2022, 09:15:50 AM »
This is the one in the red truck:

https://www.summitracing.com/parts/ati-915702

It's taken quite a bit of hard use. Torque converter flashes at 5600rpm.

 https://www.youtube.com/watch?v=Kt7xTs2soBk
Kevin McCullah


Rory428

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Re: C6 flex plate what to get
« Reply #2 on: January 22, 2022, 10:28:49 AM »
Not sure wheat ET level that  NHRA mandates a SFI flexplate, as I haven`t raced an automatic transmission car in well over 20 years now, but back when I ran a C6 in my Fairmont, I used a factory 428 flexplate , and never had any issues with it. That was over 10 years of WOT transbrake launches at 5200 RPM, with low 1.4-high 1.3 60 foot times, running mid 10s in the 1/4 mile. And that flexplate was just a stock unit from one of my 428 cores, so it was likely over 30 years old at the time.
1978 Fairmont,FE 427 with 428 crank, 4 speed Jerico best of 9.972@132.54MPH 1.29 60 foot
1985 Mustang HB 331 SB Ford, 4 speed Jerico, best of 10.29@128 MPH 1.40 60 foot.
1974 F350 race car hauler 390 NP435 4 speed
1959 Ford Meteor 2 dr sedan. 428 Cobra Jet, 4 speed Toploader. 12.54@ 108 MPH

shady

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Re: C6 flex plate what to get
« Reply #3 on: January 22, 2022, 10:47:00 AM »
FTI told me that a stock Ford FP was good to go for my 550 hp 7k 390..
What goes fast doesn't go fast long'
What goes fast takes your money with it.
So I'm slow & broke, what went wrong?
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Jim Comet

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Re: C6 flex plate what to get
« Reply #4 on: January 22, 2022, 09:32:46 PM »
I'm pretty happy with my Reactor flex plate. HD aluminum, nice SFI piece. Jim

Jb427

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Re: C6 flex plate what to get
« Reply #5 on: January 22, 2022, 10:41:21 PM »
This is the one in the red truck:

https://www.summitracing.com/parts/ati-915702

It's taken quite a bit of hard use. Torque converter flashes at 5600rpm.

 https://www.youtube.com/watch?v=Kt7xTs2soBk

Dose that Ati one you listed need the adapter and ati bolts?

I'm pretty happy with my Reactor flex plate. HD aluminum, nice SFI piece. Jim

Do they do a steal one? they look nice i don't really need a light weight one for what i am doing they have no prices on there web site how much did that cost you Jim?

Cheers.




KMcCullah

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Re: C6 flex plate what to get
« Reply #6 on: January 23, 2022, 09:43:25 PM »
This is the one in the red truck:

https://www.summitracing.com/parts/ati-915702

It's taken quite a bit of hard use. Torque converter flashes at 5600rpm.

 https://www.youtube.com/watch?v=Kt7xTs2soBk

Dose that Ati one you listed need the adapter and ati bolts?

Cheers.

Yes sir forgot the adaptor flange:

https://www.summitracing.com/parts/ati-915611

I ended up using low profile ARP bolts due to torque converter interference.
Kevin McCullah


manofmerc

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Re: C6 flex plate what to get
« Reply #7 on: January 24, 2022, 04:19:43 AM »
Look into ATIs flex plate . It is a tough dude expensive but well worth it .They have one for 428s as well (external balance )Doug

Falcon67

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Re: C6 flex plate what to get
« Reply #8 on: January 24, 2022, 11:37:26 AM »
>Not sure wheat ET level that  NHRA mandates a SFI flexplate,

I only buy SFI rated flex plates, even for a 300 HP 302.  They are not that expensive, IMHO.   In the race cars of course, nothing less. 

Jim Comet

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Re: C6 flex plate what to get
« Reply #9 on: January 24, 2022, 10:56:07 PM »
The Reactor flex plate set me back about $450. I bought mine through Blair. Jim

blykins

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Re: C6 flex plate what to get
« Reply #10 on: January 25, 2022, 07:29:32 AM »
ATI, Performance Automatic, or JW.   

I have a JW flexplate for the dyno.  I've had it on 1200 hp engines.
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Jb427

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Re: C6 flex plate what to get
« Reply #11 on: January 25, 2022, 08:53:17 AM »
Thanks everyone for the help

I also need a separator plate and dust cover for c6 to fe dose anyone remake these?

thatdarncat

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Re: C6 flex plate what to get
« Reply #12 on: January 25, 2022, 01:35:36 PM »
Thanks everyone for the help

I also need a separator plate and dust cover for c6 to fe dose anyone remake these?

The C6 inspection cover/dust cover is reproduced, should be able to find it at any of the reproduction parts companies. They turn up used occasionally.

I’m not aware of a reproduction of the separator plate/spacer plate, but they are generally easy to find. You might want to run a wanted ad on the page here, or let people know your general location, they could be one local to you. I’ll send you a message.
Kevin Rolph

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