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02-23-2005 10:00 PM #1
Hate to tell you this Trucks, but the 403 is Not a Big block. A 400 however is. The 403 is little more than a bored out 350. As such, you can bolt on heads, crank, intake ect. Check your motor to see if it is a 400 or 403.Right engine, Wrong Wheels 






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