6A - Engine Mechanical
I see in a post from 2007:
http://www.opelgt.com/forums/6a-engine-mechanical/8812-opel-springs-big-valve-head.html
That RallyBob commented:
FYI, stock spring installed heights on a 1973 1.9 engine are:
Intake: 1.57" - 93 lbs
Exhaust: 1.36" - 97 lbs
Can anyone tell me what the installed spring...