Aluminum head thickness.

hudson1948
hudson1948 Member
edited November -1 in HUDSON
Does anyone know what is the most you can mill a 308 aluminum head without the valves hitting?

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  • dougson
    dougson Senior Contributor
    Ken U-Tx wrote:
    Nominal head thickness was 2.000" Maximum milling was .060", or 1.940" thick. At .060" you often find that the exhaust valve hammers the sparkplug electrode gap shut, especially with either 309742 or 311040 cams due to their higher lift. This can sometimes be gotten around by putting an extra plug washer on the plug, but with.060" off an aluminum head, you might find it pings under load too.



    Just curious, what would be the compression ratio of a .060 milled head?
  • dougson
    dougson Senior Contributor
    [...... I've now got a .060" shaved aluminum head on a '52 308, running flat top pistons and a bit more cam than stock. Timing is about "halfway" on the factory flywheel marks, and I don't have any ping problems. .[/QUOTE]



    I love it, "halfway" on the factory flywheel marks :D, Try this on a '09 ZO6!
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