Well, gentlemen. I'm finding out more and more as this old guy tries to learn about all the new systems that make engines go. In other words, the carbs, the intakes of old, the distributors, coils, and such, are all replaced today by computers, ECU, throttle bodies, etc. But, one thing doesn't change is just how much a cylinder can take. So, IF what I'm am hearing, is we can only throw so much into each cylinder, and if we have surpassed that point, time to bore out the cylinder and go larger pistons....Makes since you want find out just where the stopping point is before you go negative. Since I don't understand everything yet, re-learning today's engines and engine management systems, I just keep making changes based on performance. As long as my times keep coming down, then, that is a good mod. Once I flat-line, I'm done. I thankfully don't have to do all the testing, as I have the Rudy's, the Steve's, the Antony's, etc, and etc doing a lot of the testing for me, and the Rob's to supply the parts...so keep testing and I will keep learning....