The hole in the head for thermactors is actually connected to the valve cover bolts, stick a pick into the hole see how deep it is, and use this to determine how far you need to drill. Also if no holes for thermactors are there then why would the hole or tube as some would call it be there
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89 Notch: 10 pt. cage, d&d rear coil overs, moser 33 plines and spool, gutted 
91 Hatch: cobra int. fms. c-springs, novi-1000 w/f-150 crank pulley (9lbs.) 
06 F-350 6.0 crew cab lariat srw 4x4: turbo back exhaust, sct xcal. 
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