Re: unscrewing plus at the end of heads
These are Vortec heads so I'm unsure if your heads are the same or not but the same hole exists between cylinders 5/7 and 6/8.
See the brass under the plug wires?
Here it is between # 6/8 cylinders.
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'84 K10, SM465, NP208, 3.42 Gears, 33x12.5-15
GM 4 bolt 880 roller block, 062 Vortec Heads
Comp Cams XR258HR-10, MSD Street Fighter HEI
Edelbrock: Performer Intake 2116, 1405 Carb
Long tube headers, 2.5" duals to Flow Master Super 40's
Vortec Engine Build
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