The engine block is machined from a solid billet of aluminum on my Hurco VM10Ui 5 axis machining center (1 of 2, 5 axis machining centers (that I know of) in the state!).
There are some details that you can make out from the manifold bolt holes to the cylinders, the bores for the fuel intake/exhaust, bores for cam rods, and the cavity for the crankshaft. The engine block is very loosely based on the LS3 engine block.
This pen holder has the increased functionality in that different sized inner diameter liners can be placed into the cylinders. So in otherwords, you can fit your Sharpie, your Pilot G2, your Rotring, and your fine tipped Sharpie! To assist with a snug fit into the cylinder bores, an O ring groove is designed into the liner (also making it resemble a piston). This makes it easy to insert, remove, and swap liners around. Acetal has very good durability and chemical resistance.
Small liner (3/8" OD) recommended for slim writing instruments such as #2 pencil, Uniball Vision, Frixion Slim.
Medium liner (1/2" OD) recommended for Sharpie, Pilot G2 deals (and most other standard sized writing instruments).
Large liner (9/16") recommended for any writing instruments just slightly larger than a standard Sharpie.
This comes with 2 small, 4 medium, and 2 large liners (the most popular configuration) and is brushed to a 400 grit finish.
For international buyers, if you would like me to quote shipping please let me know. I've often been able to get customers a better price.
Product code: V8 Pen Holder: No Side Engraving, Brushed Finish, CNC Machined V8 Engine Block deals Pen Holder