I don't have an answer for that. But I run the spring that came with my Edelbrock head with my very similar 274-S cam. Just a solid version of what you have.

I happy with that cam. Nice street compromise. More torque than I can put down on the street even with a single plane intake.

BTW you're title says 274HL- high lift cam. Might confuse people.

Last edited by autoxcuda; 05/17/11 07:03 PM.