[realsteelGM]

Still in break-in mode on this engine, it has some timing issues that still need tweaking, and compression is only 100 lbs across all 8 cylinders, tells me that rings are not seated fully yet, quench values checked out good. Any idea on time frame or special techniques for rings to seal? Everything is new on this engine including heads, vortec swirl intake with 1.94 and 1.50 valves, 500cfm carb, mild cam, slightly over stock. May just need some more tweaking before I spend more money. I do think your right on the tires and diff before spending time and money on a overdrive. I looked up the gear vendor overdrive set up, interesting, but need more info and reviews on it. Bottom line, only getting 13-15m.p.g. on highway, that was one of the main reasons I decided to build the 283, for fuel mileage and reliability. I'ts still been a challenge and a lot of fun building this unit.