Hey all,
Im changing my springs because of overrev damage, and my new springs are the same height of the old ones+shim. All the old springs had shims..I shouldnt re-use the shims right?
Thanks

Here's how I do this..

Take the spring rate that is this..

"Pounds at max. lift-seat/seat height-max. lift = spring rate"..

And compare it to what the springs are with shims by doing this...

Seat height + (shim thickness x spring rate) at both seat and max. lift and compare the two and you will know for sure what to do..

I hope I got this right so please check me guys b/c it's late............

pdq67

Hey all,
Im changing my springs because of overrev damage, and my new springs are the same height of the old ones+shim. All the old springs had shims..I shouldnt re-use the shims right?
Thanks

If the new springs are to be installed at the same 'installed height' as the old springs, then you would most likely still need the same shims,,, if the old springs were installed correctly. Lot's of if's here and the first question is, is this a solid, hydrauluc, roller,, or what???

just a mild hydraulic, uprgrading from stock to Z28 springs.

The only way to do this RIGHT is to get a height micrometer and install the springs at the correct height,, using what shims may be necessary. Because your fighting valve float,, I'd be real critical of getting it right. Most likely what you have is correct, but you will only know if it's measured. Jeggie sells an installed height micrometer (http://www.jegs.com/webapp/wcs/stores/servlet/product2_10001_10002_753947_-1) for like $40

OR cut a finish nail and file it down until it fits and measure it using a 6" long dial caliper.

You will be real close BUT not dead-nuts on..

pdq67