Where is anyone getting this 'maximum recommended lift' for 901's? Just because they list the spring force at heights of 1.650" and 1.250" does not mean that the difference of .400" is some sort of 'maximum recommended lift' spec. COMP Cams® - Specialty Valve Springs
BTW, the OP's cam is not a 292/.508 cam. It is 270/.468 (solid)... and will be lower lift once he sets lash and uses the 273 rockers. So he is gonna be around .100" from coil bind with the 901's.