GRT horsepower entry

[Storch]

I want to enter accurate horsepower information into the GRT display. Our 10 has a XIO540-D4A5, with 9.0 pistons, vetterman exhaust, GAMIs, stock everything else..
Stock factory horsepower is 260. Anyway to determine what we making now?
Thanks,
David

 

[AviatorJ]

Has it ever been run on a test cell?

 

[Storch]

No it hasn't.