Well i posted before that i had a stripped plug hole on the car i just bought, i thought i would take it out and try to put it in and it went in and tightened up. I pulled it back into my garage and shut it off, seemed to run fine but i pulled the plug back out and there was no gap. The funny thing is the plug doesnt seem like its even threading in all the way if you feel it around it. Is there anything else that could cause that to happen? Any help at all is appreciated.

 

do i need to index my plugs? The car has the mods below but also has flat tops, this did not happen until i changed the plugs so maybe??????

 

anyone?

 

Use SHORT tip plugs and index them to point at the exhaust valve.
Your engine must have a hell of a dome on the piston.

 

Pull it back apart and use thicker head gaskets. Never heard of the piston hitting the plug in a flat top piston lt1 car. Did you have a ton shaved off your heads? Anymore than .030 is too much. Or your block?

Benji

 

Sounds like you could have a combination of 2 problems. The plug hole is stripped and the plug was put in at the wrong angle and you may have some carbon build up on the top of the piston if its been a while since the engine was built. You should take a look at the plug hole carefully and also rotate the engine over by hand until that cylinder comes up to top dead. See what you can of the piston top inside.

Seems like you may need a threaded insert and some seafoam.

BTW, short reach plugs won't work. The electrode will be shrouded by the head.

 

Short tip plugs WILL work.I didn't say short reach.

 

i looked closer today and the reason the piston hit the plug is because it was on the wrong angle. Now my question when i heli coil it how am i going to get the tap straight so that it does not follow the threads that are on the wrong angle? Hopefully without pulling the head off?

 

Whether you use a heli coil or my preference (threaded insert) they both use a tapping tool that makes new, larger threads. You don't have to worry about following the old threads since it will cut new ones at the larger diameter. You will have to give it clearance so it can achieve the correct angle however.

You should do a few things to protect the cylinder from the aluminum shavings from such an operation however.