To hold the valve up you can blow compressed air into the chamber where the spark plug sits. They used to make a tool that screwed right in and held line pressure in the chamber but I dont know if they do anymore. Check the local parts store.
Brad
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93 GT 306 DSS, O-Ringed, AFR 185's, Pro Products Intakes, 55lb low imp inj, 80mm Pro-M meter, 2004 PMS, AFM Power Pipe, Kirban Reg, Vortech S-Trim 14lbs. No times yet. Trying to tune.
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