Outer Limits 4x4 Board

Has anyone added holes to there head gasket where the water jacket holes from the block to the head match up?

I was thinking this would allow a quicker transfer of water around the head for better cooling.

I have a 2f (strait 6) that runs on gas. Because of the gas burning hotter I thought this may help keep it cooler.

Another thing to do while the head is off is to polish the chambers and exhaust ports - will help keep things cooler. Don't know about adding holes though.

And how to you propose to do that? You could only polish the begining and end of each whether it is an inlet or exaust you would never reach the middle of either.

And a ported and polished head costs heaps for little gain and really only works at the top end of your engines capabilities

mudmacaca wrote:And how to you propose to do that? You could only polish the begining and end of each whether it is an inlet or exaust you would never reach the middle of either.

And a ported and polished head costs heaps for little gain and really only works at the top end of your engines capabilities

I'm not talking about polishing for improved air flow but for less heat transfer. A polished surface has less surface area - less area to soak heat. (this does help with performance too).

I did mine with a $80 dremel copy + flexi extension head - It reached all over no dramas. It's a few hours work, but a very cheap diy mod.

mudmacaca wrote:And how to you propose to do that? You could only polish the begining and end of each whether it is an inlet or exaust you would never reach the middle of either.

And a ported and polished head costs heaps for little gain and really only works at the top end of your engines capabilities

In fact at low velocities it actually works in you favour to retain the roughness to improve the flow (similar principle to dimples on a golf ball making it go further by reducing the resistance of the surrounding air)