Originally Posted by
juffer
Are they the same as standard but thicker and where could i get some of these? Do you use the satndard spring or still replace them with hight poundage?
depends what you want! karlos has fitted st170 springs into a blacktop head with 3mm shims under them, they are a higher poundage than the standard blacktop springs and he had them sitting there , i run up-rated springs with 3mm shims under them because it allows me to run about 5-6psi more when over 7k rpm and a hell of a lot cheaper than going for the double spring kit.
if i were buiding a cheap zetec again i would be trying 106gti springs!!!