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Kiknss,
70-71 made peak horsepower at 4400rpm, the 72 at 3400rpm and the 73-74 at 3200 rpm, so I wouldn't push one to far past those points. Let me know how you like the parts you put in and how it performs. I just bought a 71 400sb for my 64 and not sure how to modify yet.

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Philip Valentine
Lakeside, AZ
Team Chevelle Member #42 GOLD
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you ought to be able to redline any stock built motor to 5500-6000,as long as it is solid and built right.....I used to redline a mild 396 at 6000-6500 and it wasnt balanced...

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1972 Malibu,461 cid.
 

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How do you tell what year your motor was built? When I ran the numbers on mine it said "70-72".
kevin d
 
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