Cylinder Head Gas flowing tools

My late father George Mansfield was a cylinder head gas flow specialist - he called his business “Mez Porting”

He developed all his own tools because in the 1970’s when he started out there was no Internet, no mail order and no eBay.   

As kids we were sworn to secrecy over these tools - he considered them unique and didn’t want them copied, he would cover them up when certain customers came round. My dad came out of communist Hungry in 1956  - I think that cold war paranoia lived on for many years!!

Everything was cobbled together using parts that he found at work.  I  believe the body of the air powered tools were used to drive fuel pumps on engine test beds where he used to work (ERA Dunstable). Much of this was imparted when I was very young and clearly some things are a bit hazy now (or dad was bullshitting to cover the fact that he ‘borrowed’ them - which is more likely the case)

The key thing is you want tungsten carbide burrs, not plan carbide burs(which are useless) and you need to use air powered tools with at least a 3HP belt driven compressor. Direct drive compressors are noisy and not up to the job

Also avoid using Dremels or similar electric tools - they wont like being regularly stalled along with all the metal dust going in them.

On the left here we have dad’s old “windys” - he used standard 1/4” tungsten carbide burrs which were locktighted into a long slender shank that he made.

The leftmost one was a relatively recent addition we found on ebay in around 2005, which you can see he quickly adapted the same way.

The white carrot looking thing was just emery cloth that you wrapped up and ran down the ports.

His full compliment of tools - some were prototypes that were never used again or made for one particular job.

These are his old “Wolf” grinders which he used cartridge rolls on to do final dressing with.

He never used burrs in these.

These are my die grinders that I started collecting for myself before I inherited all my dad’s tools when he died (10 years to the day almost)

They are useless compared to dad’s versions - you can see where the chuck hits the walls.

RIP Dad    1937 - 2006     www.mezporting.com