Magnum prop pitch?

[number5isalive]

Hey guys, I have an 8 vein magnum with a 15/21 prop in a s/j running a R&D engine with 48 novis, m16 reeds, B-Pipe, etc and the props a little rooted from sucking up a screwdriver on the trailer (long story). My question is, while its being repaired shall i repitch it seeing I am riding it in the surf now instaed of racing it.
Cheers 5.

 

[Superjet112x]

Maybe 12/17 12/18

 

[number5isalive]

WOW That seems quite low for this sort of motor, wont it spin something like that, I was thinking 14/19?

 

[SUPERTUNE]

Sounds like it might be a 140mm race pump with that pitch, pretty close, I think we ran about 15/22 for a SJ superstock racer back in the late 90's.