I never got alot more power out of my ct26 after 14psi, So that's as far as I ever really kept it, usually happy with 12psi.
PS- I went 2+ yrs at10+psi on Felpro gasket and ARP's. I only went MHG when I pulled the motor for forged pistons later.
Just sayin.
I dont think they HAVE to clamp on to the plugs, but if they spark across a gap to the plug, then alot of the spark energy is lost, turning it into heat.
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