05-18-2018, 07:05 AM
580 and 700 intake manifolds are symmetrical and can be flipped. The power gain by switching to the V reed is considerable. The old reed, combined with the fact that the old style manifold has no stuffer, is a poor setup for making power. The best thing you can ever do for a stock-port 580 or 700 is go to the newer manifold with the V reed and install a larger HL Tillotson carburetor. A very good carb for a stock 580/700 is the HL232 off of an 820 engine. It is a bolt-on conversion, and there are many of them available. Any Tillotson HL carb with a 1" throttle bore will perk up the engine, provided you switch manifolds. Be careful, it is addictive! Ted