My advice.always replace the whole opti unit,I have tried cap and rototrs and you usaually end swapping the whole thing in month.I you don't know how the water pump is I would swap it.
When the opti goes bad it takes the spark module and plug wires out to,the plug wires go because the opti make alot of spark fire and pierce the wires with spark over load.
The coil get's weak so I recommend going MSD,same for plug wires if you go 8.5 plug wires they will last for ever.
the lt1 camaro's are great investment's for the money once to get all the little problems they have,and don't listen to guys that say lt1 wont make power.mine make's plenty,with lt1 style heads.
have fun
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