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We just cced my 450 gas head and it is 180 cc combustion chamber . Any 450 head will require a 450 valve cover or you will be welding in a fitting so that it will hook to your air cleaner . The tube that runs accross the top of your 8060 head just above the rockers " Is Not a Oil line " it is part of the crank case venting system . The 450 heads don"t have the threaded boss on the back side of the head for this tube to be used . The 450 s just cut that tube off about 6 " in and leave it open [ from the front of the head ] That is why there is a welded in fitting in the valve cover . Just get the correct valve cover and be done with it . I ran my 450 head last year on my super M with great results . I also bought the 450 LP manifold to go with it, it is a divorced design manifold . [ Meaning the intake and exhaust do not touch so the intake charge is not being heated by the exhaust ]. Spend you money on the head that is ware the power is made. Mine was ported and flow benched the flow improvement is a giant compared to stock head and stock 450 head .
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