1: HELP - Corvette 85-91 Engine Tune Spec's - at a glance.
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ENGINE DECAL OR MANUFACTURER APPROVED SERVICE MANUALS OVERRIDE ALL INFORMATION LISTED BELOW
85-91 Corvette Distributor / Timing related help at a glance.
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IGNITION TIMING: 6BTDC
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#1 CYLINDER LOCATION: LEFT-FRONT (68-92)
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DISTRIBUTOR ROTATION: CLOCKWISE (89-92)
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FIRING ORDER: 18436572 (68-92)
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SPARK PLUG GAP: (our supplied US Delco Std) .035
- SPARK PLUG GAP: (our supplied US Delco Rapid Fire / Platinum)..... : .045

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ENGINE DECAL OR MANUFACTURER APPROVED SERVICE MANUALS OVERRIDE ALL INFORMATION LISTED BELOW
85-91 Corvette Distributor / Timing related help at a glance.
-
IGNITION TIMING: 6BTDC
-
#1 CYLINDER LOCATION: LEFT-FRONT (68-92)
-
DISTRIBUTOR ROTATION: CLOCKWISE (89-92)
-
FIRING ORDER: 18436572 (68-92)
-
SPARK PLUG GAP: (our supplied US Delco Std) .035
- SPARK PLUG GAP: (our supplied US Delco Rapid Fire / Platinum)..... : .045
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