Has anyone used 1:8 RR on square port heads ?
what brand ?

 

The valves are heavy enough without adding more to them really. 1.8 on a stock cam or anything peaking at less than 6200ish would be ok, but why not just get a higher lift cam?

 

I was just looking to make my life
easier by just throwing on a set of rocker arms
instead of swapping a cam again. it's a PIA in my
truck, not a lot of room to work in the eng bay.

 

What cam? The lobes will matter and springs as well.
Ive used scorpion alot. I like em. Not too heavy over the valve.

 

Have Comp VVT cam, Pack 1219 springs.
was looking at Comp Ultra Pro Magnum 1.8 rockers

 

Id say no on vvt cams.

 

I don't know much about VTT but 1:8 rockers will benefit you in the torque department as they increase the velocity by lifting the valve quicker. Of course there is the benefit of more lift as-well. This is a method used by Roger Vinci who knows much about cams for our heavy trucks. My cam is fairly small: DUR @ .050" 210* / 222*, LIFT .551 /.551, LSA 116* (.585 lift with 1.8 ratio rockers). I use Yella Terra rockers. The heads are L92's with very good double springs and a 2.9L Whipple on top.

 

Imo the vvt runs into a more unpredictable territory where, even though the phaser is limited, youre effectively adding more lift/duration and may run into issues depending on how aggressove the cam is or the lsa and icl and of course overall duration at all points.

 

Sounds like good arguments to dump the vvt.

 

On the dodge vvt, if you use too much spring pressure youll throw a vvt code. not sure on the gms.
.but you are putting quite a bit more strain on the cam doing so then add more spring pressure on top.
Besides i dont like vvt anyway. Ive never seen it gain vs a std design cam.