Super Jet 6m6 650 two piece head

550headache

tobacco grower
Location
tobacco valley
Going over my j650A engine out of the 1990 square I bought and just noticed the head is 2 pieces. Looks like the top half comes off. My 61x is a solid head. Is this normal? Why would it come apart? Story this was some factory race motorImageUploadedByTapatalk1373193081.936987.jpgImageUploadedByTapatalk1373193112.269597.jpg
 
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