Packbat wrote:@07CobaltGirl: Ooh, AKI. That was my confusion, sorry.
...I wonder how close to my best time I can get with a pushrod engine. They are lighter for the same displacement....
With a comparably smaller powerband to go with it.

With cost/tech limitations, OHV is not competitive to OHC engines. They are lighter, more compact, but lower airflow (unless you compare it to 2V OHC) and low RPM (due to heavy, early valve float). They are difficult to make competitive without serious quality slider abuse. Typically, to get a 1hp:1ci, it requires at minimum 6 quality on both valvetrain, and fuel system quality is usually necessary as a companion. Once you get MOHV in the 80s(?), it gets a LOT better, but still not completely on par with S/DOHC setups (power-wise). Of course, there is a power/weight limit, and it is pretty easy to meet this one even with OHV. I actually DE-tuned this engine, as it initally was for use in the NOT-Chevrolet BelAir I built, which weighed in at a hefty 1600kg! Using the 1600kg body, I could not get it above .16 ratio, however, due to costs, and could not get the weight down either. This coupe I ended up using couldn't get much heavier either, so a detune was required. It was initially north of 265hp.