So...I know that it's generally recommended that 1.9 and zzp er rockers use stiffer springs with shift points above 6000 (although there is some debate). Currently, I'm running an '02 GP GT. Not many mods so far, not too many planned. I've currently got the TDC intake, NGK 55s, and an Overkill PCM. I'll be adding a 2.5" catted DP, the HV3 intake insert, and maybe a plog. I'm also looking at using rockers as the final piece to get this car where I want it.
so my question is, if I were to use 1.8 modified rockers with a shift point around 6200-6300, would stock springs be ok? And would I notice a power difference? I'm mechanically inclined but have a limited supply of tools, and I'm in Montana so there isn't crap for tuning support up here (everyone drives trucks, I hate it). I'm trying to avoid changing the springs because I don't want to risk dropping a valve.
All in all, would ER, 1.9, or 1.8 rockers be okay with stock springs and a shift point at 6300? What would be the best option? Or am I going to have to bite the bullet and do the springs too?
Any help would be great.
Phil
