Guys, I'm looking at picking up this Crate Engine from GM.. "330 HP @ 5000 RPM, 380 ft.lbs. Torque @ 3800 RPM (Max. Recommended RPM: 5500) 9.1:1 Compression Ratio Cast Iron 4-Bolt Block with One-Piece Rear Main Seal Nodular Cast Iron Crankshaft Cast Aluminum Pistons PM Steel Connecting Rods Cast Iron 64cc Chamber Vortec Cylinder Heads with 1.94'' Intake and 1.50 Exhaust Valves Dual Pattern Cam, Lift: .435'' Int. / .460'' Exh., Duration @ .050: 212° Int. / 222° Exh. 1.5 Ratio Rocker Arms " The Question i have is this..........They say it's only for PRE 76 vehicles. What's the deal with that anyway. Is there something different about the block or is it just some Hokey emissions thing????? Thanks Guys. Gold Canada Gold!