Thread: Spark Plug Gap for Roush 402 SR
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Old 08-06-2008, 08:30 PM
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Rick Parker Rick Parker is offline
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The Air/Fuel mixture inside the engine sure doesn't know what name is on the Valve Covers.

SPARK PLUG GAP
These examples are just starting points to get you going in the right direction. Every application is different and should be tested and tuned:
Compression Spark Plug Gap
Up to 10.5:1 .050 - .060
10.5:1 – 13.0:1 .040 - .050
Above 13.0:1 .035 - .045

PS: Be sure (don't guess) that the center button in the Distributor Cap is contacting the spring blade on rotor. Wider gaps are use to increase the flame kernal especially on a lean (emissions) type fuel mix.
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Last edited by Rick Parker; 08-06-2008 at 08:37 PM..
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