[QROtarga]

Hi all, hope you are doing well these ever complicating days!

About 15 years ago I purchased a 1972 911T Targa, in good running condition. The engine had clearly been opened before and was not assembled too cleanly, with a lot of silicon pouring out everywhere. As I had a good 1970 E-type engine, I installed that and put away the original engine, to open it sometimes and see what should be done to it, and in the mean time I collected parts to do some mild performance increase (2.2 pistons to increase the compression ratio and a corresponding camshaft). This happened this year and when we revised the different parts we were surprised that some previous owner already modified the engine, by installing RS pistons and cylinders, and machining the block accordingly. Which made my collection pretty useless, I guess.

So my questions to the experts (as such a combination is not even mentioned in the engine bible) are: after machining the block to the 2.7l diameter, is there any simple way back to use 2.4l components? Would it make sense to use the E-type cam for the RS setup (as it was, the engine used the T-cams)? Do we need to install a RS type distributor (or 1-2-3-ignition programmable one)? The last would be a simple thing to do after installing the engine and testing it. To get the best out of the RS components, what should be done to the heads?

What I´m looking for is not the ultimate power increase, but some nice power increase combined with driveability (I do not participate in racing more that old-timer rallies), combined with avoiding throwing a lot of money out of the window. If using the 2.4l option, I will have to purchase 2.4l cylinders, if using the 2.7l option I will have to purchase piston rings and the other parts you may recommend.

Thanks and be well!