If you didn't release the chain tensioner you will have that problem. If you force it on there without releasing the tensioner it will be way to tight and you'll stuff the cogs.
Falcman007 replied to Falcman007's topic in 4.0 OHC
Well I dropped the head off and he says it will be fine with a polish.
So it's getting cleaned, planned, crow HD springs, valve regrind and new guide rubbers.
Cost? dunno...LOL