place the heads cylinder side down and spray WD-40 in the exhaust and intake ports. let them sit for about 15 minutes and then pick them straight up and look underneath. If the valves are sealing well, it will be dry around them. If not, it's time for a valve job. Trey Jung <treyjung@xxxxxxxxxxx> wrote: Mark Didn;t you tell me to turn the heads over and spray WD 40 on them to see if the valves leak? What was it that I needed to do? I forgot... Trey