Originally Posted by
GNs-r-slow
What you have to see if they are for roller or non roller. They come both ways but are much different springs. Maybe the springs are done when you hit 4800?? When boost comes into play, things start acting goofy, where you may not experience it with a N/A set-up
The Vr Jr's I have come with the .650 springs, but for a flat tappet cam
ill ask spencer on here i got the heads from him.if i remember right he said they were part number 77189 which on summit does not say what springs they are