Stud girdles a good idea?
#21
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As far as I know, there are only a handful of actual valvespring manufacturers. Most springs are relabeled . Comp cams owns crane cams. Id be willing to bet the springs are made under the same roof. The 928 spring, and the 99896 spring crane recommends for the 741, have a significant difference in pressures. Crane 99896 spring is 524lbs /in vs comp 928 at 354 lbs/in .
Spring setup is critical. Ive seen used heads with install heights all over the place. I had heads redone at a shop, and when i went and measured the install heights, I was shocked in how much variance there was. If i recall it was .050 to .100 variance among them. Of course they were not shimmed to make up the variance. So, what you end up with is different pressures all over the map. Not to mention they were setup a mile away from coil bind. The install, hardware, and overall fitment was way off. .050 doesnt sound like much, but can easily be 30lbs variance of seat pressure just from that alone.
One thing my new head guy does, is takes every spring out of the box, and puts it in the spring tester. Each one gets tested for seat pressure, open pressure, and coil bind, and records it. Heck, just brought him a set of merlin iron heads recently that were setup by another shop. No cups or locators, springs were set on top of a valve spring shim! The springs were eating the shims for lunch.
my point to all this, is spend the time setting up your springs. The best spring in the world isnt gonna save you if its installed improperly. In my case, the springs were digging into the locators, and eating away at the stem seals. The hardware needs to be a good fit. A locator with a .680 shoulder doesnt go with a spring that has a .740 inner spring ID.
#23
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Tool room series springs from isky are around 500 a set right now. The crane spring, around 230 bucks, and 160 bucks for the comps.
Pac makes some high end endurance springs, manley nextek series, howards, lunati, all have some endurance style springs.
Imo, 500 hours is alot to ask out of a set of springs , unless its a low lift low rpm bbc. Like the 502, 454 mag engines that have under .500 lift stock and turn 5200rpm max. I doubt the valve job will go 500 hours anyways.
Pac makes some high end endurance springs, manley nextek series, howards, lunati, all have some endurance style springs.
Imo, 500 hours is alot to ask out of a set of springs , unless its a low lift low rpm bbc. Like the 502, 454 mag engines that have under .500 lift stock and turn 5200rpm max. I doubt the valve job will go 500 hours anyways.
#24
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I have a set of isky 9005 springs for sale. Brand new. My cams are close to a 525 cam. The same series springs were used on my engines. Pulled to 6000 on the dyno with no problems. I have an extra set because the sizes between 2 boxes were slightly different. And while it would have been no big deal I'm kind of particular so I ordered a 3rd box and used the 2 exact ones. This is the extra box. Pm me if you're interested. Here's the specs
VALVE SPRINGS [9005] - $216.00 : ISKY Racing Cams, Do It Right, Race With The Legend
VALVE SPRINGS [9005] - $216.00 : ISKY Racing Cams, Do It Right, Race With The Legend
#25
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iTrader: (4)
As far as I know, there are only a handful of actual valvespring manufacturers. Most springs are relabeled . Comp cams owns crane cams. Id be willing to bet the springs are made under the same roof. The 928 spring, and the 99896 spring crane recommends for the 741, have a significant difference in pressures. Crane 99896 spring is 524lbs /in vs comp 928 at 354 lbs/in .
Spring setup is critical. Ive seen used heads with install heights all over the place. I had heads redone at a shop, and when i went and measured the install heights, I was shocked in how much variance there was. If i recall it was .050 to .100 variance among them. Of course they were not shimmed to make up the variance. So, what you end up with is different pressures all over the map. Not to mention they were setup a mile away from coil bind. The install, hardware, and overall fitment was way off. .050 doesnt sound like much, but can easily be 30lbs variance of seat pressure just from that alone.
One thing my new head guy does, is takes every spring out of the box, and puts it in the spring tester. Each one gets tested for seat pressure, open pressure, and coil bind, and records it. Heck, just brought him a set of merlin iron heads recently that were setup by another shop. No cups or locators, springs were set on top of a valve spring shim! The springs were eating the shims for lunch.
my point to all this, is spend the time setting up your springs. The best spring in the world isnt gonna save you if its installed improperly. In my case, the springs were digging into the locators, and eating away at the stem seals. The hardware needs to be a good fit. A locator with a .680 shoulder doesnt go with a spring that has a .740 inner spring ID.
Spring setup is critical. Ive seen used heads with install heights all over the place. I had heads redone at a shop, and when i went and measured the install heights, I was shocked in how much variance there was. If i recall it was .050 to .100 variance among them. Of course they were not shimmed to make up the variance. So, what you end up with is different pressures all over the map. Not to mention they were setup a mile away from coil bind. The install, hardware, and overall fitment was way off. .050 doesnt sound like much, but can easily be 30lbs variance of seat pressure just from that alone.
One thing my new head guy does, is takes every spring out of the box, and puts it in the spring tester. Each one gets tested for seat pressure, open pressure, and coil bind, and records it. Heck, just brought him a set of merlin iron heads recently that were setup by another shop. No cups or locators, springs were set on top of a valve spring shim! The springs were eating the shims for lunch.
my point to all this, is spend the time setting up your springs. The best spring in the world isnt gonna save you if its installed improperly. In my case, the springs were digging into the locators, and eating away at the stem seals. The hardware needs to be a good fit. A locator with a .680 shoulder doesnt go with a spring that has a .740 inner spring ID.