[powderfinger911]

Hello All

Im new to the forum and have a matching numbers 911 with a 1969 2.0E engine which has been modified to S spec in the past (Heads, Cams, MFI, Crank, Intakes etc etc). Its a low miles engine which is very freshly rebuilt, even so I would like to get more power out of it which essentially means more displacement. Is this reasonably possible without discarding most (or all) of what I currently have? I have read a lot about 2.5/2.6 short stroke engines but they all seem to be built using 2.2/2.4 engines as starting points. Is it possible to build one with 2.0S heads using custom pistons e.g. JE and still get decent compression?

Im not in a position to simply put my engine on a shelf and buy another one, ($$$) and Im loathe to sell the matching numbers (1R) block I have. The only other option I have is to sell the entire S spec setup, heads, crank, MFI pump etc and build an entirely new engine which is a lot of money and effort considering most of what I have is brand new. Im hoping I can maybe just go to 90mm pistons and have the space cam changed and see a big improvement this way, maybe with a change in cams too if necessary. What do we think?

Along the same vein. Is building a 2.5/2.6 on a 1R block doable? I know it is far from the best choice of casing. What mods to the casing should be performed if doing this? (i wouldnt be tracking the car and reving at >7k for long periods, just spirited road driving). I know my casing has had updates including squirters and intermediate shaft bearing and hydraulic tensioners etc but im unsure of what else it may have had done regards integrity (doweling etc). This will check for these checked upon disassembly regardless of what direction I take.