- Oct 21, 2006
- 419
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I'm using Motorcraft SP-447A Plugs with the GT-40x heads. Was just wondering what you guys that are running these heads are gapping the plugs at?
When I bought the motor, Ford Racing said 0.044. I've seen 0.045, 0.050 and 0.052.
Thanks !
When I bought the motor, Ford Racing said 0.044. I've seen 0.045, 0.050 and 0.052.
Thanks !