[Z06] Spring life (when to change valve springs?)
06-25-2018, 07:25 PM
#102
Awesome, sounds like a killer setup. My 383 for my drag car is spec'd for ~600hp but has yet to see an engine dyno. GenII LT1 block, 12:1CR, , GTP ported AFR220 heads(227ccs after porting, flow 330cfm@.7"), maxed out supervic, .73x race solid roller. I'm thinking it will be closer to 650 since it was a little overbuilt.
The lift is not the primary deciding factor in valvespring wear, it is the ramp rate of the lobe - how fast it gets there. A .650 lift cam with a mild lobe and the right spring can have little to no reduction in valvespring life vs an OEM setup.
Technology has advanced a lot in the last 20 years and I would not expect ANY hydraulic lobe to eat a set of quality springs in 15k miles. Even the more aggressive HR grinds are relatively mild off the seat compared to a solid roller. We are talking street cars here, not 8500rpm race motors that only see a few minutes of run time between rebuilds. If you are only getting 10-15k miles out of your valvesprings on a hydraulic roller street car then you are not running the correct parts.
The lift is not the primary deciding factor in valvespring wear, it is the ramp rate of the lobe - how fast it gets there. A .650 lift cam with a mild lobe and the right spring can have little to no reduction in valvespring life vs an OEM setup.
Technology has advanced a lot in the last 20 years and I would not expect ANY hydraulic lobe to eat a set of quality springs in 15k miles. Even the more aggressive HR grinds are relatively mild off the seat compared to a solid roller. We are talking street cars here, not 8500rpm race motors that only see a few minutes of run time between rebuilds. If you are only getting 10-15k miles out of your valvesprings on a hydraulic roller street car then you are not running the correct parts.
Last edited by Millenium Z06; 06-25-2018 at 07:26 PM.
