16-04-2013, 02:29 PM
You dont want head work on a stage 1 as larger ports give lower gas velocity, as ruan says the head is probably fine till at least twice stock power.
There is a reasonable bit that can be ported out of them, have a look at how much bigger the hole in the gasket is compared to the holes in the head/manifolds. If you get the head ported youll need the manifolds done to match. Polishing is a contentious matter due to the useful effects of a certain amount of turbulence.
There is no space to fit larger valves on the 8v HDi
Piper can re profile your cam however weather this makes any gains is the subject of much debate and ive not seen proof either way.
There is a reasonable bit that can be ported out of them, have a look at how much bigger the hole in the gasket is compared to the holes in the head/manifolds. If you get the head ported youll need the manifolds done to match. Polishing is a contentious matter due to the useful effects of a certain amount of turbulence.
There is no space to fit larger valves on the 8v HDi
Piper can re profile your cam however weather this makes any gains is the subject of much debate and ive not seen proof either way.