Valvespring question
10-23-2011, 01:14 PM
#1
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Valvespring question I'm about to swap in a 5.3 into a Blazer xtreme. My question is can I use dual valvesprings with a stock ls1 cam. I want to do this because I will be installing a turbo about a month later after. I want to make sure there are no problems running naturally aspirated before I install the turbo. Would this be ok or would that be too much spring pressure. Thanks.
10-23-2011, 03:40 PM
#2
I'm about to swap in a 5.3 into a Blazer xtreme. My question is can I use dual valvesprings with a stock ls1 cam. I want to do this because I will be installing a turbo about a month later after. I want to make sure there are no problems running naturally aspirated before I install the turbo. Would this be ok or would that be too much spring pressure. Thanks.
PAC 1218 or 1518 beehive springs (or similar in other brands) would be way more than you'd need with a stock LS1 cam.
10-23-2011, 06:46 PM
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So if I go with a turbo later I would not need to change springs again? I was under the impression I would have to use dual valvesprings when going turbo.
10-23-2011, 06:50 PM
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it would really depend on how much boost, the dual valvesprings should def give you piece of mind and longevity. You can get new ls6 springs for super cheap and they would be able to handle considerable amount of boost now that im thinking about it, I would throw a ls6 cam in the motor. i think i saw one in the classifieds this morning mad cheap and a GREAT turbo cam.
10-23-2011, 06:51 PM
#7
Don't know why you would. All the springs are doing is making sure the valve train follows the cam profile without floating off the cam lobe. Having a turbo will not change the way the lifters/pushrod/rocker arms behave with a certain valve spring & cam.
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10-23-2011, 07:09 PM
#9
are closed. The number of square inches of cross sectional area (minus the
valvestem diameter) times the amount of boost (psi) determines how much
force is working against the valvespring even though the cam isn't. If the OP
does go w/the Z06 cam...which is a good choice, the yellow GM springs
should not be used as they are intended for NA and the lightweight valves.
I'd strongly consider the PSI maxlife beehive !!!!! Works with the factory
retainers and seals, has great pressures to work with a larger cam, heavier
standard valves, AND boost.
10-23-2011, 08:32 PM
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Ill be running mainly 10lbs but might go to 15lbs everyonce in a while. I will use a ls6 cam now that I think of it. I currently have Prc dual valve-springs but I haven't put them in. So it would be ok to run the dual springs for a coupe prolly 500 miles at most until I go turbo. Good info guys. Thanks.
10-23-2011, 08:57 PM
#11
FYI...boost continuously pushes at the back of the intake valves when they are closed. The number of square inches of cross sectional area (minus the valvestem diameter) times the amount of boost (psi) determines how much force is working against the valvespring even though the cam isn't.