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I think it depends a lot on what's been done to the 400. The LT1 car should be a consistent low 13 or high 14 sec car. If the 400 still has the low compression it came out of the factory with, horsepower will be in the low 200s if it's tuned properly and running right. If it's running rich and timing is a little off, HP could be in the 180-190 range. No cam or exhaust will make power with crappy heads and 8.5:1 compression
Remember performance was crap in this era. Corvettes in this time period were 15 sec. cars stock
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