So my curiosity got the best of me today and I was wondering how all these motors stacked up against each other. I chose these motors because they are all very similar in displacement, they were all readily available back in the day, and with the exception of the Pontiac, were all big blocks. For comparative basis let's assume these were all 1970 motors with no rare options such as Ram Air IV, dual quad setups, etc. All of the horsepower and torque ratings these cars had from the factory were conservative to say the least for insurance purposes. What I would like to know is how these motors compared to each other, brand new back in the day, side by side. I'm not necessarily interested in opinions. This is a Pontiac forum... obviously our opinions will strongly lean towards the 400. I'm more interested in factual information. So throw some numbers at me! Peak horsepower and torque and at what RPM's, bore, stroke, airflow, compression ratios, engine weight, whatever you can think of.