Butler has the edelbrock springs listed incorrectly. They are single springs, they have very high spring rate to dampen harmonics because they are a single spring. The only thing good about them is they cheapen the spring and cam, or complete head kit up to make them look cheaper.
The 73100 are pretty weak. Only a 333lb spring rate. Doesn’t seem like that matches up with what you post earlier which were said to be in the engines??
Last edited by Jay S; 09-08-2021 at 09:28 AM.
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