Help reading plugs.

[MD68]

These are the first plugs to come out of the new build, after about 50 miles of around town cruising.

Specs:
‘70 340
.030 over
X-Heads
kB 243 pistons
Comp 268h cam
HEI Ignition
Doug’s D453’s
Quickfuel Brawler 650cfm
Timing set at 12 initial, 32 all in
Plugs are Champion RN9YC

Any experienced opinions welcomed!!

 

[yellow rose]

You need to take better pictures. Need to see as much porcelain as you can get and close ups of the ground wire for starts.

At your compression ratio I think the 9 is a bit cold. I'd use the RC12YC but only after some better pictures.

 

[GEO]

Look a little cold , I'd personally shove them back in for while.

 

[RustyRatRod]

I think they all read "CHAMPION"

 

[famous bob]

I think they all read "CHAMPION"

TIMING TOO SLOW, PLUG A LITTLE COLD, JETTING IS OFF, MINE LOOKED WORSE THAN THAT W/ THE SELF TUNE IN MY F.INJ SYSTERM …………..JMO

 

[yellow rose]

I think they all read "CHAMPION"

And they have that huge 13/16 hex. Again...one of my pet peeves. I hate that hex.

 

[MD68]

I’ll get some better pictures up as soon as the work schedule will allow.

 

[furrystump]

Take a cut off wheel and cut at the black line through the crimp, not into the porcelain, then pull the porcelain out. It shows everything.