Aluminum heads and spark plugs

Aluminum heads and spark plugs

@318willrun has a video which illustrates the plug hole issue and how he addressed it.

Newbomb Turk said
What cryptic threat.

Newbomb Turk said
You are skating on thin ice.

slantsixdan said
Exposed threads in the combustion chamber are several different kinds of a bad idea.

I fully agree, however I am not in a position to redesign the existing combustion chamber. This was just an idea I had while
inspecting my old plugs from my truck and was looking for feedback on. Ideally the spark plug entry to the combustion chamber should have been spot faced to eliminate the plug being sunk/shrouded.

slantsixdan said
Go get an NGK ZFR5N (stock № 3459), which has projected electrodes along with physical specs (thread, etc) that match the RC12YC, with a similar heat range. Thread it in and see if you like what you see.

That plug will certainly help to better place the spark event into the chamber and would be an improvement.

Ironmike said
What heads are those? To me, neither one looks right. I run NGK BK6RE (stock#6962) in my Edelbrocks and they fit perfectly.

The heads shown in the photos are from Promaxx. You might have the Edelbrock heads for the Magnum engines which do not have this issue...

mygasser said
try fine tuning the 'projection' by stacking gaskets/washers on the longer hemi plug. you can get it where you like it then.
neil.

I was thinking the same thing.