Lifters: hydraulic vs. solid
#3
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Generally with solid lifters, you can run a more aggressive cam lobe with more lift/steeper ramps and run it to higher RPMs without float because you can get away with much higher valvespring pressure. They need to be adjusted more often though because you'll have a lash spec to maintain. Also, they will tend to be noisier (for obvious reasons) and therefore can cause issues with the knock sensor. To take true advantage of them, you probably need to be revving your car really high and have head work.
#6
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Hydraulics do not require lash adjustments, soilds will allow higher revs. Remember that you will probably need valve springs and a tubo upgrade if you want to spin much over 8k.
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