Cam shaft in my 273

MP solid
Purple Shaft Cam & Lifter Kit
Fits: 273/318/340/360
Adv. Duration: 296°/296°
Dur. @ .050'': 252°/252°
Lift: .557''/.557''
Centerline: 110°
Basic RPM: 3400-7200 RPM

who knows...just get the lift off a pushrod and you can usually narrow it down to a few common grinds. I bet MP is the maker though, not many cam makers would include a 273 in their catalog with specs.