Quote:
Originally Posted by prandelia
For the last 2 years with my OE manifold and stock redline, the 350 is the best all around for NA motor. Now that I'm going to 8K, the 250 might be worth a try. That is something that could be tested relatively easily on the dyno. We'll see.
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The 350 was designed for the daily driver enthusiasts to eliminate the torque dip. and create the most overall power under the entire curve (idle to redline) The 250 shifts the powerband up about 3-400rpm, and should make more power everywhere above 5500 rpm, and hold onto the power slightly longer. Even if short shifting at 7k you should never be under 5k rpm. So for racing scenarios the 250 is the best for NA. For casual daily driving the 350 is. I’d even say with 8k redline the 150 would be the best if you always shifted at 8k. You’d need to look at what has the most power in the powerband (rpm range between shifts) with stock redline its 250.