falcongthophase4Mar 28, 20200 min readBLUE PRINT & X NUMBERS GT-HO RESEARCH X ENGINES are not exclusive the the GT HO PHASE 3
1973 & 1974 MORE PHASE IV HI OUTPUT B S STILLWELL"S Mick Webb saw there was a demand for more of the evolving V8 grunt local Aussie muscle cars so a GT-HO PHASE IV power upgrade was offered
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