Porsche964FP said:ras62 said:Why a 993 engine ? As for 3.8 it is a whole lot of cash for little benefit.
993 engine - cheaper than a rebuild. Has been done to great effect. Although it's another gamble on another engine. The car will no longer have matching numbers.
3.8 - torque values are higher. Which depending on preference can be preferable. If the OP needs new barrels and pistons the price jump between 3.6 and 3.8 is worth considering.
I personally would not consider 're-skimming' cams - I would replace. If the OP sticks with the intake manifold he has I would consider cup cams and a remap.
Possibly upgrade (if early 964) to the plastic manifold and consider a HotFilm/ MAF conversion.
Besides all these possible decisions are only worth considering once the full diagnosis is complete and the budget is considered...
I dont see any sense in putting another old engine in, who knows what condition it is in and loose originality? I dont understand the great effect comment, it is virtually the same engine, what am I missing?
If barrels are shot then 3.8 could be considered but I dont think you would notice any difference over a well sorted 3.6 The urban myth seems alive and well.