I'm looking to change the cam in my 5.3 suburban
but do i size the cam according to the stall converter or vise versa?

i'm am confused on this

 

You can do it either way, you just want them to compliment each other. Do you currently have a stock stall and Cam?

 

yes
i have stock converter and cam

 

can someone give me their opinion on this cam?

XR265HR Cam Spec:

Cam Style: Hydraulic roller tappet
Basic Operating RPM Range: 1,500-6,800 RPM
Intake Duration at 050 inch Lift: 212
Exhaust Duration at 050 inch Lift: 218
Duration at 050 inch Lift: 212 int./218 exh.
Advertised Intake Duration: 265
Advertised Exhaust Duration: 271
Advertised Duration: 265 int./271 exh.
Intake Valve Lift with Factory Rocker Arm Ratio: 0.558 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio: 0.563 in.
Valve Lift with Factory Rocker Arm Ratio: 0.558 int./0.563 exh. lift
Lobe Separation (degrees): 115

 

Comp Cams 212/218 LSx Cam "HIGH LIFT"

id say get it.... its a great cam for heavyer trucks. that and a 3000-3200 stall with a big cooler

 

Thats a very good torque cam. As for the converter, depends on what you do with and what you want out of your truck. Do you tow? how much? what is the primary purpose of the truck?

 

Thinking the same thing! Just make em coincide with eachother they need to agree lol