timing and tune | Pontiac GTO Forum

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matt68gto

· Registered

Joined Mar 22, 2006

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42 Posts

Discussion Starter · #1 · Jul 28, 2006

what should my timing be set at, in advance, and idle on a 68 400?

IcemansGTO

· Registered

Joined Jul 29, 2006

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6 Posts

#2 · Jul 29, 2006

9 degrees btdc works well for most 400's or a 389.

Idle is around 500 for an automatic, 650 for a manual.

Dwell is 28 to 32.

bill

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