I have one of these, and it is a very nice head, however the one you have could either be the same, or can be crap. Like I said before, each casting number has both good and bad heads of that casting. Its all about who was on the machine that day I reckon
been looking for a 14cc head no luck.got the jt-09-10-86 head .going to build limited predator billit longrod.308 cam 304wx carb,1.2 1.3 rockers.thanks for your help.