[Tim81ta]

I would have to disagree with you on that MrPbody. The 350 orginated from the 327. The bores are the same, it's the stroke that is different. I have don't research into building one up for a high performance application. While these engine have less power then your 350 and 400 due to size (cid), the 327 with the shorter stroke will have a higher Red line, and will rev out more with the same grade parts as a 350 or 400. I usually us a speed of 3500 feet per sec for piston speed. This speed is usually good for your mild performance parts. Also, if you design the valve train right, you can rev the engine out even further, but this can be done with motor.

So, it all depends on what application you want. I like small blocks cause they are cheaper to build and weight less. But on the other hand I like big blocks due to the large amount of power out put.