1 BAD HK GTS Monaro. Original HK GTS Monaro 307, now 419Hp Blown 307, built by Grants Performance. 8.2:1 static compression, forged pistons, steel crank, rods, alloy Racerpro heads, 9" diff 4.11 gears, posi lock centre and 31 spline axles, Turbo 350 fully manualised. Standard da... View...