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Does it pop thru the carb? Has the head had any work done? Intake manifold in good shape? What plugs are you using? Coil? 12 volt with a resistor, or electronic conversion? Base timing? Distributor in good shape? What does the plugs look like colorwise right now and whats the gap set at? What rpm range? Has this engine ever been rebuilt? I got a Late 403 combine engine in my 460. Its a Sleeveless 263, 3-9/16 bore. 503 combine manifold, 503 combine distributor, 715 carb, with a C-200 governor. Still has points, with an Accell coil, with a resistor. Autolite 3116 spark plugs, (got em at wallmart in the two packs) gapped at .032. I dont know what the base timing is set at, I set it on the dyno, and my damper pulley has no marks on it. I run 93 octane fuel, Ammoco ultimate. The head was rebuilt, stock valves, and was gasket match ported on the exhaust side to the gasket pattern, manifold too. Intake ports were left alone. Valve lash is at .025 hot, (190 degrees) The short block, only has new rings, new rod bearings, oil pump rebuilt. The combine did not have many hours on it and was in very very good condition. Bead honed the cyls, cleaned them out, all new gaskets and retorqued them twice. After about 30 hours it woke up and I could start dialing it all in. The rings and gaskets were cheap, the head was the expensive part, But worth every dollar. I dont have $600 in the motor, just alot of time. Ran it two weeks ago, 5000# transfer, 2nd gear 16.9 X 34 tires, power wasnt a problem for it, darned ol rusty gas tank stopped it dead in its tracks though. Hope this helps!! Chad
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