I measured the spring pocket on the bare alloy heads I've perquired & they look to measure 39mm= 1.550"
but im well confused as to what size springs & locator's I can use with them.
do I need to take spring retainer thickness into account when calculating valve lenth? ising an old valve it looks like a 4.911 valve lenth wouldbe right with an installed hight of 1.70"
im only looking to run a .450- .470 lift cam on the motor what options do i have???