The spark plug holder

Here's the big twin spark plug frame holder, poured this morning, not too bad...!

Need some finishing to be operational...!

Hahaha, something told me, pouah...., don't worry ! You can split the spark PH after pouring but NO!
I splitted the wood pattern, and it will be easier...

So, here's the splitted pattern picts...

Today's pour, nicely done, need machining now...

2 holes and threads for the tube hanging, 

And 2 big holes and threads for the spark plugs