LOOK!!!! need help

[240sxRturbo]

#4 piston hitting spark plug........and when i hit the gas at an idle the car sucks in air and then revs up i am so lost i have run out of ideas please help

complete new motor all new parts besides crank and i had it checked and shes a ok

[compactfean]

Time for a rebuild. Bare minimum replace bearings mic crank (if its been checked polish crank) and new oil pump and re ring the pistons.

[240sxRturbo]

ya ..no .... this is a rebuild everything in the motor is brand new new pistons rings rods bearings etc etc etc etc

car ran absolutly amazing for a couply days and then dizzy went bad started it back up a day later and it had this wired idle and it would rev up right so i replaced intake gaskets ( again) and now the #4 spark plug got flattened out so now i have a feeling its all in the head cuz i have checked the crank its good i have done a platagauge on the rods...etc etc... its all good so all tha leaves is the head i a pulling it today and i will post pics if i find something

[compactfean]

Hnmm if piston is hitting spark plug and bottom end is good the only other thing it could be is if the head got milled too much. The other thing (which happened to me) I had a tiny Allen bolt in my cylinder ...the one that hold the coil cover . Got it back from the machine shop that way....cost them a pretty penny. It kept flattening plug and did a bunch of damage to the head.