| Carbon will deposit into that 'hole' (indent) and may lead to pre-ignition (detonation). The easiest thing to do would be to polish the combustion chamber (would be a good idea to do all of them similarly) to remove the indentation. This will lower your combustion slightly (probably an undetectable amount in the range of 0.08 static compression for ~1cc) The other option is buying a new head.
------------------------------------------------------------------ 1992 300ZX NA 5 Sp (Dead) 1990 300ZX NA Auto 2+2 (Dead) 1990 300ZX TT 5 Sp (Building) 2004 G35 Sport 6MT (DD) |