kidcamarosc

I picked up a set of world sr torquer heads (67cc 2.02,1.6 valves) and im just wondering with zz4 roller cam if the springs (1.25" single spring, 100# seat, 560" max lift) that are included with the heads are going to be good for the cam. (208/221 .475/ .510 112 lsa). Im doing some research trying to peice together the right parts for the 350 im building up

kfoley

I'm don't know a whole lot about roller cams, but I'm pretty sure you need bigger springs with more pressure off the seat for the faster ramp rates of the cams. If I'm wrong, please correct me.

84305HO

I don't know if the springs will be OK (which is the question at hand) but I think the combo will be excellent since the Torquers
really flow well at .450 to .500 lift. I am thinking about the comparison between the ZZ4 Al heads vs the Torquers.

Vader

KFFoley is right on it. Better springs with that kind of valve accelration rate are going to help make the best power at any kind of RPM.

You mentionecd 100# @ installed height (I think), but what is the spring rate? What kind of spring pressure at 1.20"?

kidcamarosc

i can't seem to find any info on the open load of the 1.25 springs just the seat load of 100@1.85. i'll have to email them. but the zz4 crate motor uses lt4 springs i think which are have OD of 1.32 seat load of 101@1.78 an open load of 250@1.33 coil bind at 1.22 and rate of 332