How to make high lift 212cc springs work on a 420cc ?


New member
i would like to make the springs from the 212cc work on the 420cc because they allow over .400 lift. i ran .360 lift on the 212 and i noticed they only sell valve springs that go to .375 for the 420cc and that just wont work for me.
I guess i could stretch out the 420cc valve springs so the coils are spread further and then insert the 212 springs?
thats what im thinking about doing.


I think that's open pressure @ .375" lift not max lift like your thinking


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Dawg 89
At .460 lift you need a spring that will do .500 before coil bind .
A custom spring or one from another application is going too be required .
Jr dragster or motorcycle come too mind still thats a lot of lift .