01CamaroSSTx

iTrader: (3)

Different lengths going into the combustion chamber but each have the same size threads however the TR7IX have tapered threads which is what can damage the threads in the cylinder heads.

01CamaroSSTx

iTrader: (3)

Double06

Go to Brodix web site they give the plug needed for street or track use. These Brodix heads need a washer style plug to stop then from going in too far. With a tapered seat the taper will stop it but that maybe too far in as they are designed. Brodix just used the washer type plug for no special reason. Many of the aftermarket heads use the washer style.

grinder11

iTrader: (1)

AFR also uses washered plugs. At least, they used to use them on the older cathedral 205s and 225s. If the OP used tapered seat plugs in a head meant for washered plugs, there's the likely answer. Now, who installed the wrong plugs?????

Rich2342

iTrader: (1)

I think I have the answer..

How to pinpoint the failure? Are people here saying a spark plug kissed a piston head due to length? Or thread pitch?

Anyone got an illustration?

01CamaroSSTx

iTrader: (3)

What about the borescope in that cylinder?

Rich2342

iTrader: (1)

I have to get one. Local stores dont have any..

Kawboom

Get one that plugs into your laptop. Its like $12 on Scamazon.

Che70velle

iTrader: (6)

Ooooh. Me want one. I have a scope with its own little screen…I’d LOVE one of these you speak of.

Kawboom

I have bought three of these, one for me, one for my old man, and a spare, and they're worth their weight in gold. It says you can plug it into your phone but mine requires me to download some Chinese malware in order to use it, but if I plug it into my LAPTOP and just select "camera" from the search bar, it works flawless. The head is no bigger around than a pencil, and it even has a decent picture quality.

grinder11

iTrader: (1)

Thread pitch makes no difference. Thread LENGTH would. With a tapered seat plug in a hole made for a washered plug, the tapered seat plug will screw in too far.....And screw up the female threads in the cylinder head, too. NOTE!!! To anyone who has done this, make sure you chase the threads in the head BEFORE you bolt it on the block again......

QwkTrip

iTrader: (23)

Length the spark plug protrudes into the cylinder.

Also, your spark plugs have a tapered seat meant to make contact with (and tighten against) a mating taper in the head. The taper is also how it makes a seal to the head. They're saying your heads probably don't have a taper like that, but instead have a flat surface for a washer to set on. You can look inside the spark plug hole in your cylinder head and see whether the seat is tapered or flat.

Your spark plugs maybe have both the wrong length and the wrong type of seat.

jayyyw

Yup, something hit that plug. Looks almost like mine when I had a ringland let go. Luckily for me, the sleeves were fine.

I was also using the "wrong" plugs I just found out. I was using standard TR6 plugs. But I changed plugs pretty often and did not have signs of interference on any of the plugs until the ringland incident.

QwkTrip

iTrader: (23)

From the Brodix website, BR7 heads

Spark Plug Starting Points:
14mm 3/4 Reach Seals With Washer
NGK R5671A-7
for Pump Gas
NGK R5671A-8
for Racing Gas

helicoil

iTrader: (104)

Tapered seat plugs are .708" reach, gasketed seat plugs are .750" reach. I have never seen tapered seat plugs installed in place of a .750" gasketed seat plug cause a problem with contact. This is somewhat common with the LS community. Stock heads use the taper, a lot, not all of the A/M heads will used the gasketed .750" plug, so people get it wrong often. Just my .02. Keep looking.,.

Mickyinks

Whats wrong with TR6 plugs , i use them and no issue

grinder11

iTrader: (1)

That may be true. I have no data one way or the other. I just figure that the tapered seat plug has no defined stop, and would screw into the female threads until it could go no farther, due to the body being too large, or thread galling.

jayyyw

Nothing is wrong with them. They are just apparently wrong for the Brodix heads I was running as they call for a gasket seat plug, not taper.

Mickyinks

All good then

01CamaroSSTx

iTrader: (3)

One example would be if the rod bearing got wasted then the piston can come up higher out of the bore and this could cause the piston to make contact with the plug.