Pivoting from 340 to 360

moper said

and be aware a lot of the purported .904 lifter designs need true dual springs so the spring seats and guides will need attention on the heads

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Just curious: Is this for some 'purported' .904 cam lobes (like what ones?)? Or a general statement for .904 lobes? Not seeing where a 'longer-duration-at-.200"-lift' lobe requires more spring... IMHO it is less of an issue with the springs 'over the-peak'.