Aluminum heads and spark plugs
Absolutely not. You are skating on thin ice.
A 3/4 reach plug is not shrouded.
Care to elaborate?
For such a blunt reply accompanied by a cryptic threat, you've provided no substantiation or details.
- the bottom photo shows the projection of the hemi plug vs the RC12YC, and there is clearly shrouding with the latter;
- The hemi plug threads right in without issue;
- Gasket style is identical to that found on the RC12YC;
- There is about .250" clearance from the ground strap to the deck surface so there's no chance of mechanical interference on zero deck, flat top piston setups; and
- The plug is not in the opening path of the intake valve, so no concerns there.
The only concern I see is the possibility of carbon buildup on the exposed plug threads making plug removal difficult, but the exposed threads would be getting washed continuously by the incoming fuel charge.