1.7rr

[fiveohGT]

I just ran a search and didn't come up with anything. This is a pretty broad question but I was wondering what advantages there are (if any) to having a 1.7 roller rocker instead of 1.6?

So if someone were to run afr165's, Performer RPM II, FTI cam and 1.7rr what would be the difference if 1.6rr were ran instead?

If someone were to run afr185's, Performer RPM II, FTI cam and 1.7rr what would be the difference if 1.6rr were ran instead?

If someone were to run afr185's, Performer RPM II, Trickflow stage 2 cam and 1.7rr what would be the difference if 1.6rr were ran instead?

Sorry for the questions, I'm just trying to develop an understanding of what the outcome of 1.7rr will be.

What needs to be done to successfully swap in 1.7rr's? new rods, etc.

 

[vristang]

Multiply the 1.6 or 1.7 by the advertised lift of the camshaft. This will give you the lift seen at the valve. The downside to 1.7rr is that piston to valve clearance can be an issue with big cams or shaved heads.
I don't think pushrods are usually necessary.
Roller Rockers (at any ratio) will ruduce friction in the drivetrain, thereby improving power/efficiency.