Cutaway,

A lot of the McCoy steel-fin engines were so "reasonable" in price that they were more likely to be disassembled and (often wrongly) reassembled by VERY inexperienced people. I dearly HOPE the factory assembly troops knew better! Not precludng the possibility, of course, but despite the low cost of the engines, there were some very good people in the vicinity... Dick McCoy was in on developing all of the early ones, I believe. Bill Netzeband worked on them during the square-block/Dykes ring/ Series 21 era. Both are legendary in the best of 'circles.'

Also, as a callow youth, I did reassemble one of the first slant plug steel-fin baffle 15s wrong-way around. Easy to do. Head doesn't fit because the fence is on the wrong side? Turn the head around. Whaddya mean the 'higher port' faces the exhaust stack? I can see a port when I look in there...

Anyway, lukesp has it right, now.