Well gee no wonder my car was having issues above 5500RPM. I had my valve springs measured and they were at about 85lbs at the seat. Don't know how that happened but either way Comp Cams recomended I go 145-150lbs at the seat if I go with a double spring which is what I want to do.

I'm just wondering what are you guys running with this cam. I have 1.7intake and 1.6exhaust T&D Shaft rockers by the way and those wonderful Comp-R lifters with about 6000KMS and no problems........touch wood.

 

what kind of springs do you have?

 

I'de be more worried about what kind of damage the valve float did. I would atleast pull the intake manifold and make sure the lifters are ok and try to check the cam lobes through the lifter bores.

 

Supposedly these springs ( Comp double spring ) had about 130lbs at the seat when they went in. Originally I was gonna run a Comp 305 cam so I think he sprung it with that in mind and never changed them when I decided to go for the 467.

I don't HAVE to run beehives do I?

 

They (beehives) solved my valve float that was happening with the 987s.

 

i got crane 10308's with 1.6 rr's on that cam

 

The XFI lobes are rather agressive and were designed specifically to take advantage of the beehives strengths.

The 1.7s are going to make those lobes hell to control, IMO you need to start thinking before you buy but maybe a set of 120 beehives will patch it together for now.

 

Well, my head porter measured the springs on the bench today and got 115lbs. The other measurment was on the car and although it was not as accurate, it did tell us my springs were screwed.

It's hard to believe that there is not a dual spring that would work in it's place. The Comp tech said 145-150 at the seat would do the trick but that seems a little high to me for a hydraulic lifter.

 

Did you have to shim them? If so, what seat pressure did you reach?

 

.015 but that was on lt4 heads.. i am sure it would take the same on lt1 heads. they come with the .015 shims.

 

The nature of beehives is such that they require much less pressure to control the same valvetrain motion, some estimates put it as as much as 25% less pressure.

Stock lifters will handle 140+ just fine.

IMO the 145-150lbs would be minimum on the seat pressure you need with beehives given a 1.7 rocker on XFI lobes, if you want to use a dual spring you will need to go higher yet. I look at this as setting it up a little extra stiff though for two reasons, one you can't have too much control and two the springs will lose a little something as they break in.

 

Thanks for all the responses guys. I'm gonna set them to 150 and see how she likes that and go from there. I should have them in tonight and I'll update the thread as to how they worked out.

 

You can usually go 400 to 500 more rpm with beehives.

 

UPDATE: Well I finally got a set of 987 Comp cams double springs in my car today and she FINALLY revs clean to 6700RPM which should be more than enough with the 467 XFI cam in there. They were shimmed to achieve 150lbs at the seat and I believe a little over 400lbs open.

A special thanks to all who gave me input on this.

I can now FINALLY get some dyno numbers and hit the track too!! WOOT!!

 

Let us in on the rest of your setup as well so we can see what you're making. I'm running 145 on the seat and just under 400 open with my XFI.