My personal experience is this. I've had 1.6 rockers on several cars...with stock springs and have not had an issue. Now I would also suggest getting better springs though. I haven't had a problem and lots of guys don't but it's very very good insurance to go ahead and get some good springs.

 

good videos

 

I know, they show the true torture springs go through. Did you notice how much that spring wobbles in the seat? I would hate to be a spring!

 

Make sure you pick a popular set of tried and true rockers for your car. I made the mistake of choosing some rockers recommended to me for cheap by a forum member, the company said they fit, they did not. It may have been the .600 lift crane springs I was running but either way the rocker body extended past the roller and hit the spring retainers, I couldn't imagine how they would fit any lt1 spring. I asked the company about it and they instructed me to grind the "snake bite" of the rocker body to get them to clear. I tried them out for a short time but decided that they were not worth the uncertainty and put the stockers back on. They also made something in the vavletrain squeak on long drives just before I changed them out.

Is it true that you only gain the power in higher rpm's? I never spin it that high so I figured it wasn't worth it for me in my street car.

 

no you gain power across the board bc it increase the lift of the cam. Its like doing a very very small cam change.

 

Perhaps I'll reconsider then with some good nsa full rockers in the future. I just don't want to adjust my valves again for a long while, it's not my favorite thing to do. I had to do it several times after head gasket job b/c I just couldn't get it right, it was my first time for both. At one point one came loose, and I got fed up and put the stock rockers back on and tightened them down to stock preload which I think was 3/4 turn and put polylocks on them. What's the whole measuring the push rod thing? I was confused about that when I had the 1.6 in but I just dropped them in because It thought I didn't need to measure. Maybe that's what caused the squeaking before I changed them back.

 

you always measure pushrod length when you replace them to make sure you get the right ones. Even when doing no head work or anything its good to measure bc the wrong length could mean motor catastrophe

 

I have some sa 1.6 promags ill let go for cheap. Pm me...