Have them measured. When choosing a cam your static compression is really important. if it were mine I would pull the heads.have them pressure tested for sealing, guides, and seat/open pressures tested, also have the Chambers cc'd so you know what your dealing with. for example if they setup the seat pressure at 130# the lobes on most hydraulic flat tappets wont last long. Not floating just means there is enough open pressure to keep them closing with the cam lobe, ramp rate. having a good cut on the valves is as important as the cam. If they are stock it will leave a lot of flow on the table as the seat and valve angles have a profound affect on flow at different lifts. For example if the head flows best at .300 to.488 lift you want a cam that will maximize.open time in that range (duration) going with a .544 lift will just result in a nastier idle sound and less power average. Now the fun part is figuring up the dynamic compression, any long duration grind will want more static compression or your dcr will be so low the hotter cam will lose power. Sound mean but will be a slug until.4k+ rpm.
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