2000 Blaster Head Rechambering

[OTriGnO]

Bought a 2000 blaster a few weeks back and I've been waiting for an excuse to tear it down to see whats in it ever since it was able to beat my friends .60 over '06 blaster and finally melted it down last weekend, tore it apart a day later to see what needed to be replaced. Just a simple ring, piston and jug bore. What I'm really posting about is that my head looks like its had work done. My friend with the above blaster says his head is flat, mine however has arching striations... about 6 if i remember correctly, from the center arching out... is that rechambering or something else? I'll post a pic if I can find my camera

Extras done seem to be:
D&G pipe
1/2 reed spacer
open air box (i did that since it wouldn't idle and bogged in top end)
aftermarket crank (not sure what type or mm length)
head work

 

[FLOTEK]

its been machined down, looks like around 2mm (a guess judging by the pic)
the strange cuts are often called turbo or swirl cuts the idea is to help emulsify and direct the burnt gases to increase effecincy ,sounds great on paper but bascily does nothing but collect carbon in the dome ... seems you should be running quality high octane not any 93 pump gas on this head or it may detonate ,this could have lead ot the meltdown

 

[WorkingClassSkin]

Interesting work. I've done swirl porting to Flathead V8 heads in the past and I can tell you that it can really help. Then again, a flathead needs all the flow help it can get.
Fuel charge+u turn=pathetic power.