These go in the head to plug hole. If you only need to run a single spark plug and you have dual plug heads, these will solve your problem.
out of stock
Comes with 3 different spring cups to remove springs of all sizes up to 1.675" race springs. Removes springs when heads are off the engine.
Hemi Rocker Arm Adjustors 7/16x3/8 Ball side oil hole
Hemi Rocker Arm Adjustors 3/8 x 5/16 Ball no hole (Regular Adjustors)