Mods in sig. Would I see a pretty good gain with this?

 

If your springs will take the extra lift and there is enough piston to valve clearance.
Don't want to punch the valve through a piston.
Ya need to check everything.

 

Everything is ok to take the extra lift. Just wondering what kind of gain I would get out of it.

 

Maybe 5-10 HP.

 

I ran all the mods in my sig with stock 1.5rr's before I added the 1.65 rr's last. Noticable top end difference. DO IT!!

 

The only 1.65 ratio I am aware of are the C.A.T. brand ones and would not feel safe with those under much stress.
I would say see if your valvetrain will handle 1.7 and look into Harland Sharp or some other quality brand.
If you found a quality 1.65 please share.

 

You'll have no problem as long as your springs are up to it. It's go for some hp.