Dual valve spring question....
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Dual valve spring question.... I guess im not exactly sure what the difference is between single and dual valve springs. Im assuming the dual springs are rated at a higher lift?? Do they look different than single springs??
A dual spring is just that, 2 springs, one coiled inside the other. They look different and are typically rated for higher lift.
shows a single on the left, dual on the right.
shows a single on the left, dual on the right. 
Joined: Dec 2004
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From: Dallas (Richardson), TX, USA
Duals add another layer of security because the chances of breaking both springs is slim. However, the inner spring is usually quite weak, so you can still very easily get P-t-V contact.
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Originally Posted by ws6_bandit
I see. So the TR 230, being a "lower lift" cam, would be safe with single springs. btw its a .575/563.
