#8showstopper
Member
I have a 212 non hemi predator with a rpm issues at about 7200-7300 ish. The build is 212 non hemi predator with stock bore, .040 longer arc rod with a stock hemi flatop, F275 DYNO cam, stock crank, clone big valve ported head with 32mm intake 28mm exhaust valves, 1.3 ratio gauge rocker arms, green stripe dual valve springs with titanium retainers, 28mm mikiuni on alcohol. The problem I'm having is around 7200-7300 rpm it acts like vavle float it will not rev past that rpm it kinda sounds like a lo206 hitting the rev limiter. I have changed coils have 45 thousands gap no difference changed plugs checked cam to make sure the dot was lined up with the crank. It ran that way last year I freshened it up for this year and it's still doing the same thing pulls very hard all the way up to 7200-7300 rpm doesn't stumble or anything just at a loss what to check next I want to send the head off and have the spring pressure checked cause right now the spring intalled height is around 1.0" maybe more like 1.1" I'm at work so I can't check it right now that's why I'm thinking it's floating the valves cause the installed height is more the I think it should be any ideas would be helpful