I'm boosting a 5.3 Z71, Putting a .562 lift cam in it and only running 10 lbs max just for racing. It will probably be launched on the street with all for wheels but the drivetrain is getting a big upgrade. It's a daily driver that hauls trailers occasionally and requires a lot of reliability so it's probably only getting 7lbs daily driven and even less for towing. Any suggestions for valve springs? Remember reliability is a big issue.

 

most people use Patriot duals.. but the PRC stuff seem to have a nice setup but as anyone with duals i tell people to let them warm up a little...

 

Somebody at Texas Speed tried to say that duals are hard on the valvetrain and lifters and would affect reliability. Sounds like BS to me

 

Anytime you exert more pressure on something it is gonna effect reliability. If your only going for around 10lbs, have you thought of just using LS6 yellows?

 

I have yellow LS6 springs and I run about 10-10.5 lbs with my maggie with no problems. But I do have a little less lift, but I think duals with .562 is a little overkill. Just unneeded stress on the valve train IMO.

 

What happens when they warm up? Is the valve spring integrity compromised?

TSP actually recommended the PRC duals for my new setup (.602/.605 lift, 10psi) and on stock lifters even, so yeah I don't know where thats coming from.

Not to **** on your idea here, but I wouldn't run LS6 springs at that boost level being so close to the max lift recommendation of those springs. Little too much time in boost at high RPM and this might happen...

It happens to me last weekend. So I'm going a little overkill on the springs this time around. Bad things happen when heat hits the back of an intake valve.
https://www.performancetrucks.net/fo...=479680&page=4

 

Over kill= a good thing if it's gonna last. I probably won't run 10lbs very often but when I do, It will be in a ***** out high reving war with some of my Camaro buddies

 

Yeah I wasn't thinking about the lift he was going to run. On my build I went with yellows but I am just using an LS1 cam...... That sucks about your valves.....

 

2 solid choices in my opionion. Heavy spring pressures dont really affect to much in these modern motors. the cams are solid billet like and lobes dont flatten, most setups have a stout LS7 lifter, and the rockers stock have been 1000HP. pushrod length is more critical.

First choice is the Livernois Motorsports valve springs they handle i want to say .670 or .690 lift and are made by the same company that makes pro stock valve springs.

comp cams high end LS springs. they are pricy but they do what there made for.

 

PAC Racing .600" Lift Beehive Springs should get the job done without breaking the bank. I've read that a few people with higher mileage motors have had trouble with PRC dual springs when they didn't replace the valve seats at the same time. I have no experience with the PRC's myself but I do run 7lbs of boost & .581 lift with the PAC springs.