i was told that you have to remove the large clutch pedal spring if you go with a diaphragm style (Centerforce) clutch. Apparently, over 5,000 rpm the pedal goes to the floor and won't come back???

lose the spring

Its common practice to remove that spring. Don't know about the "over 5000" thing. The point is that the diaphram clutch takes less effort to depress.

Remove it!!!

I never removed mine and havn't had any troubles in 10 years on a hemi that has no problem @ 7200 rpm.

Seems to be hit or miss on if the spring is a problem or not. They have a note in the instruction's that says if it happens to remove spring not that it's a must remove.

If you need to remove the spring expand the spring with the pedal and either put washers,pennies,or even wood shims in the stretched out space and move the pedal and it will come right off.

I had mine on for a while and never a problem.Then I remived it and its been of for at least 15 years now.The CF clutch is that old also.Still like the day it went in and it gets beat on.Rocky

second 70, thanks for the advise as to how to get the spring off; big help.

My CF clutch is 15 years old as well. Took the spring off day one. Wife drives the car. Pedal pressure is good. Raced the car as well, never an issue.
Doug

Easy way to remove is depress pedal.Install washers between the coils.Then let pedal up and it should come out pretty easy.My son did mine.Took him about 10 minutes total.Rocky

A few months back I had to make the decision whether to go with a diaphragm clutch and remove the spring or buy another B&B clutch and leave the spring in.
I have read a lot of stories on how easy it is to remove the spring using the washer method and also about the battles some people had getting the spring out.
I decided in the end not to try and remove the spring expecting a battle. So I went just bought another B&B clutch.

Look at the pictures below. At the time, they helped me make my decision to not mess with the spring.

The first one is with the pedal all the way up. The spring coils are slightly open.

The second picture is with the pedal all the way to the floor. The coils are hardly open.

I had expected that when I put the pedal all the way to the floor that the coils in the spring open up with decent gap for the washers, but that was not the case as you can see.

The reason for that is the spring kind of goes over center.

I know the idea on the spring operation. I just thought the spring would have been stretch more with the pedal on the floor then with the pedal being all the way up.
There is more pedal travel from the over center point with the pedal on the floor then there is with the pedal all the way to the top.

I added the spring to my diaphragm equipped Ebody. Cut down considerably effort to depress and hold down. Love it, makes the car civilized to drive for once.

Never does pedal stick to floor even at 6k rpm. It's all in proper adjustment for me

I posted a thread sometime back how to stretch and maintain spring so as to get the spring installed. With photos using a floor jack as an aid.

Shooting some lubricant on spring and washers will help to remove them

When you have a chance take a look at the spring midway between all the way up and down. Or just watch the gap between the coils as you go from all the way up to all the way down.

If it ever warms up a little, I will do that...