the cam i will probably use has a .585 lift with 1.5 rr and it is a ex grind cam

i need to now which set of springs would be better.

987s

od............. 1.430
id.............. .700
seat load 138 lbs at 1.850
open load 325lbs at 1.250
coil bind 1.150"
rate 344lbs

or

977s

od 1.460
id .700
seat load 155lbs at 1.850
open load 419lbs at 1.250
coil bind 1.195
rate 441lbs

opinions please to me it looks like the 977s are better. but what do i know.


can some explain to me what seat load is and what open load
is and also rate. and also the coil bind number does that mean they are to .600 if not how much?

because ive never seen a cam with a 1.195 lift that would cause coil bind.

and according to the id (inside diameter) number i assume i would also have to have the heads cut for the valve springs

just trying to learn alittle more.

thanks.

 

Those springs need the heads cut. Normally you would go with CompCams recommendation on springs, give them a call. For most of the XE grinds they recommend the 987 springs.

Call me crazy but the specs you have listed for the 987 don't add up. If you crunch the numbers you get a rate of 311 lbs/in but you also list a spec that says 344

You sure you have .585" lift? Is that a higher lift lobe as compared to the "regular" XE lobes? The regular 236 lobe gives .556" lift at the valve with 1.6:1 rocker arms.

The "better" springs are the ones that meet the cams requirements. Too little spring pressure and you will get premature valvefloat, to much pressure causes valvetrain deflection, more parasitic power losses, and beats on the guides and seats more.

The coil bind number means that when the spring is compressed to a total height of 1.150" (for the 987) the spring will be stacked solid. If the spring is installed at a height of 1.850" you would need to lift the valve 1.850"-1.150"=.700" to bind the spring. This spring is good for .600" lift with an extra "safety" clearance of .100"

You need to call CompCams for their recommendations and choose a spring package based on that. If the 987's are good enough you might also want to consider CMotorsports spring package. $90 gets you the full set (springs, dampeners, chrome moly retainers, and locks... use the stock seats) that fit on stock heads and is going to be lighter than most other springs. These are brand new and I don't know of anybody using them yet but they look like a good package.

 

well the cam will probably be the 230/236xh and it has a .585 lift. or the other cam choice is the 236/244hl and it has a .575 lift. both from cmotorsports. but the cam will depend on how my heads my heads turn out.

i dont see any valvle spring on there site

could you run the 987s to to a .620 lift with out problems.

 

any other opinions


ttt

 

They have springs. Give them a call.

http://web.camaross.com/forums/showt...threadid=80883

 

im looking for a good set of springs, bcuase i dont want any valve float.

thanks again guys.

ill call cmotorsports