Back in the day I used to race with a 400 that had stock rods with nunzi's rod bolts and trws. It was in a 79 trans am, and i used to shift it when the tach read 6k.
Move forward a few years and i had a 455 with the same stock rods that i shifted at an indicated 5,500 rpm.
Then i installed a rev limiter set to 5,500.
Imagine my surprise the first time at the strip when the engine fell on it's face at an indicated 5,100 rpm..... the factory tach was slow to the tune of about 400 rpm. So i had been shifting my 400 around 6,400 and my 455 around 5,900 on stock rods!
Luckily i don't have any two piece rods or blocks with holes in them as a result of that.
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