[455Darren]

Did the search only found general info. Looking to replace my 10.4' Center Force II with a 11' Dual Friction set up. Car spec is 9.3 comp, HEI, Q-jet, '70 iron intake, Doug's headers, RA VI type cam. SFI steel flywheel, M-20, 3.31 12 bolt posi, 255-60-15 Radial T/A's. Current set up has signs of some slippage and has never grabbed hard during shifts. Who has experience with the Dual Friction?

[ponchjoe]

Sounds similar t what I am getting ready to build. I'm probably going to check out the McLeod stuff. I'm going to subscribe to see what others think.

[Old Man Taylor]

The 11" CFDF is all I've been running for some time, and I've been quite happy with it.

[421-6speed]

Originally Posted by Old Man Taylor

The 11" CFDF is all I've been running for some time, and I've been quite happy with it.

Same here in my 61 and I have hammered on it and never had any issues.

[rexs73gto]

I run a RAM duel friction clutch right now on my 73 GTO with a 400 .60 over right now with a RA IV CAM E-Heads RPM intake Ram Air exhaust M-22 4spd with 373:1 rear. It grabs good I hasn't slipped onec & I also used it with my 462 & it has all the same parts as the 400.

[i82much]

on the street my ram oem-style organic disc held up fine behind my 505. i think for street only a stock clutch is adequate.

[blykins]

My recommendation would be a RAM HDX series.

However, I would check the adjustment first. If there's little to no clearance between the pressure plate fingers and the throw out bearing, it could be putting a little preload on the pressure plate.

FWIW, I've sold hundreds of clutch kits over the years and I've gotten more complaints about Centerforce clutches over everything else. Their pressure plates are no more than Sachs/Luk/Valeo pressure plates (that you can get from Autozone/Advance Auto) that have their weights added. The weights are not predictable....sometimes they add clamping force....sometimes they don't.

Not trying to solicit business (I could sell CF products if I wanted), but I would look closely at a new RAM or McLeod piece. For anything around 400-450 hp at the motor, a RAM HDX series or a McLeod with a 100 series disc will be more than adequate.

Check the adjustment first though.....

[stags]

Originally Posted by i82much

on the street my ram oem-style organic disc held up fine behind my 505. i think for street only a stock clutch is adequate.

Agree!! I finally pulled the whole setup out of my car - Hays/CenterforceII and went back to stock flywheel and clutch. All my issues went away and it holds fine when I get on it. Couple friends have +/- 500hp setups with Ram stock replacement clutch and no issues.

[455rebel]

What's wrong with the center force ?
I've had one in one of my classics (450-500HP)for about
20 years now, hammered on it a lot,lots of burn outs,
never a problem, easy on the left leg too!
Never had sticky tires on it though!

[Old Man Taylor]

Originally Posted by 455rebel

What's wrong with the center force ?
I've had one in one of my classics (450-500HP)for about
20 years now, hammered on it a lot,lots of burn outs,
never a problem, easy on the left leg too!
Never had sticky tires on it though!

I ran the CFDF on the track with 29.5"x9" slicks. I launched at 5000 RPM and ran 10.80 at 129.31. The clutch worked fine, and continued to work fine until I took the engine out for other reasons. I also had good luck with the McLeod. Your experience may vary.

[PDC]

I have CF Dual friction on both my cars. Very smooth engagement - no chatter - no slippage. I am very happy with mine.

[stickboy]

I also used the 11" CFDF for at least 10 years. It held up fine with mild clutch slip launches at the track, and a lot of street miles. I recently replaced it with a McLeod Dual Disc only because I broke the center marcel/spring part of the disc on a heavy foot upshift. This was with the current setup, it never missed a beat with the iron heads/11.70 level.

[i82much]

Originally Posted by stags

Agree!! I finally pulled the whole setup out of my car - Hays/CenterforceII and went back to stock flywheel and clutch. All my issues went away and it holds fine when I get on it. Couple friends have +/- 500hp setups with Ram stock replacement clutch and no issues.

In the old days I ran a Hays borg and beck setup that lasted a lot longer than the parts counter diaphragm remans I had been running. In retrospect, I am not sure it was the borg and beck that helped it hold up, I think it had more to do with just buying a decent quality part instead of a junk reman.

[Don 79 TA]

i too have been using CFDF's for many years with no issues, and know many others with various makes/power levels with no issues either
although any decent brand will probably suffice too
even the Brute Strength (I think from Borg Warner) Dia... setups worked well for me too
of course those were well under 500hp setups and no slicks

[455Darren]

Thanks for the replies! I do keep an eye on the throw out bearing adjustment so that didn't appear to be the cause to the slippage wear. The Center Force Dual Friction looks to be running $360. But I will check out the other brands as well. With getting older, I do like the light pedal.....

[blykins]

Most of your RAM and McLeod pressure plates will be anywhere from 1800-2200 lbs clamping force. Not enough to require leg presses.