They are good for .600, how safe is it to run them at there limit. Say a cam with high 580 to mid 590 lift. Would they live long or would it be best to switch to 921's. One cam I was looking at had 595 598

 

i really don't know how long they would live at that lift. but me personally i'd rather have more in excess than live on the edge. but then again, a lot of manufacturers underrate what their product can do. so maybe 918's can handle the lift being that high all the time.

 

600 lift is coil bind at installed hieght, I checked it on a set of spair heads I have.

The closer you get to the limit the faster they wear out. I would get a set of Patriot Dual golds or something like it, just think if you break a spring you drop a valve and well you know what happens when that occurs, with duals you got an extra spring to cat the valve. I went with 918s for the 6L build since its a mid 550s lift cam and I got a damn good deal on the springs otherwise I would have a set of Patriot Dual Golds, they come with titanium retainers all for 250 which is a damn good price for what you get.

 

i have 918s and rev as high as 7k a few times. my cam is the TSP TV2 which is 232/234 595/598 112 and i have over 7k in miles since may when i put this together.


its not always about lift its about lift and duration also, and not only that but about the type of lobes youre using

 

you'll be fine with 918's with that much lift cam.

 

Thanks I just wanted to see how some other people felt about this. I pretty much feel the same way as goshawk and 1slow on this.

 

small duration+high lift=hell on small springs
large duration+high lift=not easy on small springs

There are people hitting 40K plus on 918s, me personally I wouldnt do it, its just an easy preventative maintenance thing IMO.

 

on average how long do the 918s last?
mileage wise

 

i seen combos on tech with 40 on them

 

918's get my vote on this topic