Quote Originally Posted by moilami View Post
Owww, you are right! So it have two exhaust pipes coming out of one cylinder
Admit: you have learned here lot of technical stuff!

It's called twin exhaust port engine. Pretty common thing on big displacement, four valve thumpers (but not exclusively - check out Chinese "Suzie" GN 250 engine clones, only 2 valves and only 250 ccs, heck, I think I saw somewhere even GC clones with dual exhaust ports). And this doesn't ends - often those big thumpers are fitted with two carbs. All this is is about gas flow, scavenging effect, back pressure...

BTW, did you enter metal scraping business? It looks that you are somehow strive to get near big amount of steel. Where did you found this "Sherman"?