Got a good deal on a set of heads that have patriot gold extreme 660's on them. My question is, I only plan on running a 228r cam are those high lift springs gonna be too much pressure for only .588/.588 lift? Any help would be great. I know its good to have some extra room but is that too much. Thanks

 

Its overkill. That cam doesn't need that much spring to control as the lobes aren't too harsh. What is the seat pressure on the Extremes?

 

^^^
not enough to hurt anything...
more is better until you start to crush the lobes... you have a while before that happens...

no disadvantages to running a spring with higher pressure and extra room before coil bind...
and they will typically last longer as well which means less maintainence

over time, as springs wear out, they get weaker..

as an example.....
so if you have 400lbs of seat pressure and you need a minimum of 300, then all is good...even if it drops to 350 over the course or 20,000 miles..its still good enough for your setup

 

Or you snap the rockers due to too much seat pressure...has happened on many accounts. Many threads on here about this. Just do some searching OP. ^^ Good added info Soundengineer

 

Patriot Golds do not snap stock rockers...

Patriot Gold Extreme .660" max lift (Spring Pressure Closed: 155 lbs. @ 1.800" Spring Pressure Open: 410 lbs. @ 1.140")


hell the PRC Springs...
PRC EHT .675" max lift (Spring Pressure Closed: 161 lbs. @ 1.800" Spring Pressure Open: 472 lbs. @ 1.150")...and nobody is having issues with that...

I'm running a bit more than that with no issues


typically when you snap a rocker, its because a spring broke, which causes way more stress on the rocker than the springs ever did...

there are guys making some pretty big power with way more lift and way tougher springs that are not having issues....

 

The extremes are fine on the seat pressure area, but the PRC's are pretty harsh...even the ones rated at .650 lift. The stock rockers are claimed to be able to hold 400# seat pressure reliably. Im not saying he is going to snap a rocker within the first WOT run lol. Im simply stating that it does start to wear on the rockers (tips).

 

You'll be fine with those springs, they're less than 380 lbs at .600" lift, and they'll lose some pressure over time.

Springs that are 450lbs open pressure will damage valve tips if used with stock rockers in a daily driver.

 

Use some PAC 1518s you will be better off.

 

https://ls1tech.com/forums/generatio...ough-idle.html
https://ls1tech.com/forums/generatio...ke-rocker.html

 

Wow. Thanks for all the info guys. I should mention I am not going to be using the stock rockers and would like to stay away from a beehive spring in case I decide to go bigger later.

 

Would I be better off going to a bigger cam. If so any suggestions? Don't want to lose a lot of drivability. Just a bolt on car with lightly ported 241s.

 

Also should say these springs are used so they have probly already lost some pressure.