Hi, we just bought a 1987 Ford F-250 XLT Lariat 4X4 extended cab 8 foot bed. it has a Holley 650 carbureted 460 engine with a 10.5:1 compression ratio, an RV cam, and flowmaster exhaust.
does anybody think they know what the spark plug gap would be on this truck? i know it's far from stock, but...