I think to much some slap me, 3s < 5s Options

[macavely]

Ok so toyota has the 3s block which is a great one we all know this .. but see as its te 3th make of the S block wouldn't the 5S be a better block ? ... why would toyota make the 5 th version of the block weeker then that of the 3rd? .... and while at it why would the internals be weaker ? it just would make any senne for toyota to not move up .. and keep there "toyota is for ever " thing going ... and then why would they put the 5S in so many cars and in the one that they sell the most ? unless it can take abuse like a pro ? then i'm thinkin my eingine has 221,XXX K miles on it and she is still strong ... and doesn't burn oil ? now what i want to try is doing is fine and camary with the SS and boost it the right way and see how much before it will blow up ....

[Galcobar]

The block is determined by the second digit in the engine code: S block, M block, etc.

The preceeding number is the generation of the engine using that block. The 5SFE is therefore the fifth engine type to use the S block.

The reason the 3SGE is better than the 5SFE has nothing to do with the block per se. It is the head geometry, reflected by the F or G. F is a narrow valve-angle head aimed at producing a more torque-oriented engine with low-end power for drivability and fuel economy. The G head is a wider angle, encouraging higher RPMs and thus higher HP peaks, with a greater overall output.

The internals in the F-head engines are always lighter than in the G-head engines because they don't have to handle as much stress and, being lighter, encourage fuel economy. They last just as long as the internals of a G-head engine because their lighter build is matched to a lighter load. This would be why a 5SFE can never match a 3SGE's potential, particularly under boost, even though it has greater displacement -- it would break.

I would, however, love for someone to explain how replacing a crank increases displacement, since it's the size of the combustion chambers contained in the head which determine displacement.