I purchased some an20 fittings in some strange attempt in thinking they would do for the engine breather upgrade. I didn’t really think that through until they turned up and realised exactly how big an20 is.
An20 along side an16
luckily I purchased some aluminium an16 at the same time, which is what I’ll use for the breathers.
I fabricated a small plate the shape of the crankcase breather mount and tig welded it on, excuse the poor weld. Haven’t tig’d aluminium for a good 6 months and I wasn’t exactly good at it in the first place. However it’ll do the job just fine.
then I poked some holes in it and that’s that little job off the huge list of things to get done
as planned I started porting and polishing the head. Nothing really to shout about it’s only a mild port to help things along a bit.
As you can see very little taken out of the intake port. A small amount by the divider and a general clean up to remove the rough casting. Most of the work on these heads are around the valve bowls.
A bit of reshaping done and opened out a small fraction. But as said it’s just a mild port so nothing special.
Well that’s 1 port done 7 more to go but I’ve got to wait for more flap wheels to turn up for the little remote dremel to continue.
I’ve completely forgot how long it takes to do this with the tools I have since doing the last head. Still it doesn’t really matter how long I spend on it. It’s a labour of love after all
