combo= 355 sbc , flat top piston , vortec heads , dual plane intake , 4777 650 holley .073 pvrc - 74 /80 jetting - blocked hsab , small reverse cam , 58mm t3/t4 turbos . 8-9 lbs boost . 120 mph @3600 race weight . 91 octane pump .msd 6530 . 23 degrees timing . 11.3 afr thru the lights

2 different cylinders . only 1 cylinder had much of a heat line on the strap . #7 has 2 aluminum balls from detonation and some grey ash.
no other issues on other plugs. took out a head gasket on #6 . thoughts ??

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Sometimes I'll cut them and look for the heat mark on the bottom of the strap. When did you move to Oklahoma?

 

moved in 2009.
here is pic of combo.

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Damn, I knew I hadn't seen you around, but didn't think much about it.

Car looks good. Do you think it's hurt?

 

First and third pic look a little light. Same side as #7?

 

how is your project coming?

 

the spark plugs in the pics are from #7 (2nd pic )
the other is #4

- - - Updated - - -

i think a set of gaskets and it will be fine . just trying to prevent a repeat.

 

So opposite sides?

 

Slowly, I keep getting distracted.

 

10:1 (flat tops with 64 cc vortec chambers), pump gas...pulling about 1*/psi (since vortecs usually like low 30's for NA timing) at 9 psi...seems a bit aggressive particularly with possible distribution issues from a dual plane manifold.....just my thoughts and what jumped out at me.

 

#6 has zero signs of detonation . it is just a clean plug due to liquid in the combustion process.
heat line on strap almost invisible. i will pull a couple more degrees until i get a handle on what ever the issue is.
debating if the overly rich mixture is playing into it.

 

i forgot to mention i was using autolite 605 spark plugs.
i am also thinking i might need a colder plug

 

for a starting point we usually start at 2 heat ranges colder than stock and go from there

 

i think i will try a autolite ar103 plug this next time.
i have the same combo with a dished piston same heads on more boost with no problems.

 

#6 and #7 went lean? Looks like both head gaskets could have blown,#6 side just went 1st. My guess would be the dual plane intake is causing uneven fuel distribution to each cylinder. I went to a single plane on my car for this very reason. Is there an intercooler? May look at backing off the timing until it is figured out.

 

i do not believe #6 went lean. because the coloring on #7 is different than all
other cylinders there is a possibility it is leaner than the rest .

it will take me a while to get the car back up and running again as i am working
on the turbo wagon first.