
06-17-2008, 04:43 PM
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Senior Club Cobra Member
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Join Date: Feb 2000
Location: Midland Park,
NJ
Cobra Make, Engine: ERA 389 427s/o
Posts: 1,247
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Not Ranked
Did you already have the Corvette motor to work on?
When I was researching an engine build that was the common percentage I was given.
The deposit you gave to ERA only represents 10% of the car, so think of that as the offset to the motor. 
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