badazz99ss

iTrader: (16)

hey wussup guys I have some valve springs that are rated to .600 lift from texas speed. the 918 spring if im not mistaken its been a couple months that ive had them but im getting my cam put in this week. I was wondering with those spring rated to a .600 lift will me running the ms3 cam with a .603/ .609 113 lsa be safe. Thanks alot

Darkman

iTrader: (2)

I would not use the Comp 918 for that cam. I would use a PAC 1518 in a beehive of a PAC 1221 in a dual.

SweetS10V8

iTrader: (4)

I personally run 918s with .621" lift.

918s are a great spring that I use on almost every engine I build.

badazz99ss

iTrader: (16)

1. @darkman why do you say you wouldnt run that spring with that cam?
2. @sweets10 how long have you ran that spring with a cam with that size lift?

Darkman

iTrader: (2)

The only engines I build are my own. As a do-it-your selfer I try to choose components that are well within the recomended specifications even if it costs more to do so. So when the manufacturers sets a maximum lift I treat it as such. That particular cam carries very well and makes power out to 6,800 rpm - it invites high rpm operation. Since I do like changing valve springs frequently, I would choose springs with some "headroom" in the specifications.

MYSTIC-1SC

iTrader: (14)

^agreed they set spring specifications for a reason. Im sure you could prolly get away with it for a little while, but i dont think its something you should risk. Get springs that are rated to deal with the lift specs of your cam.

Z28/2002

iTrader: (27)

I used PRC .650 lift springs with my MS3

Ethan[ws6]

iTrader: (13)

I'm pretty sure that the 918's are a .625 spring, but either way, if a spring is rated to be good for a given amount, why would you even think about exceeding it?

badazz99ss

iTrader: (16)

well the story is that I bought alot of stuff from texas speed all at one time and I ordered the prc dual springs .650 lift and I got everything in the mail except for the springs retainers valve locks etc... and I called texas speed and they said they were back ordered. and about a 4 days later I get a package from them with springs that wasnt duals they were single. I didnt think too much of it because I had alot of stuff going on at the time but now that im finally putting my cam in I took a longer look at them and I knew something wasnt right and I threw the box away so I dont know if their the 921's or what and they dont say it on the spring so idk. Im not going to say their 918's because I really dont know but I was starting this thread to see worst case senario if they were 918's would they be safe. But seriously I dont know if their 921's or not and its deffinately too late to ship them back it was about 5months ago so im stuck on what too do.

vettenuts

iTrader: (4)

Once you know your installed height you can figure out the valve spring clearance to coil bind. Advertised lift really doesn't mean much.

Darkman

iTrader: (2)

The Comp 918 is a single spring, the Comp 921 is a dual spring with the same specificiations as the PAC 1221.

Edit: Additional research indicates that the Comp Cam website lists the maximum lift on its current 918s at 0.625" even though the Texas Speed website continues to list 918s as having a 0.600" maximum lift.

You might want to check with Texas Speed as to whether there is a real change in the hardware or just a different view as to their reliable limit.

badazz99ss

iTrader: (16)

yea i will give them a call monday and see if they are rated to .625 I surely hope so. Thanks guys