[unclebilly]

Ummm, you are missing something pretty important.

Not all Dynos are equal. It appears that the Dyno that Porsche used Bach in the days to get the HP ratings for our cars was a lot more generous than any Dyno my cars has been on.

Some Dynos are quite stingy.

If you are looking for high HP numbers that's one thing but if you want HP for a race car to improve lap times that is quite another.

I have yanked CIS off of 2 cars to build race engines and have gone to carbs. CIS is all about fuel economy, Carbs give better throttle response, better tuning at the top end, and are simpler to troubleshoot. Oh and they are 20-30 lbs lighter.

CIS is better for cold starts - carbs have no choke.

I have run both Webers and Zeniths and I prefer Zeniths with custom throttle bodies.

One more point: CIS engines have Pistons that won't let you run aggressive cams. To change the cams, you have to do Pistons. CIS won't run right with aggressive cams due to reverberations in the intake. This is why you won't find many data points on engines with just carbs.

On the chump 911, we did carbs and distributoress ignition on an otherwise stock 2.7 and it was way different than a stock CIS 2.7. We did this for simplicity and ease of tuning.