[91 Celica St]

sort of, it all depends on what you mean by "forged internals" if your trying to say they both have the same parts (both have, lets say hks storker kits or both have cp pistons and eagle rods) then i guess you could make a comparison, but otherwise they really are 2 completely diffrent blocks, even though they are both s series.

put it this way, stock, 3sgte is better BY FAR

pistons/rods-3sgte cast pistons and cast rods, but they can handle more boost becuase the metal (alluminum alloy) they were made from as opposed to the 5sfe pistons and rods

cranks- heres the whole reason why the 3sgte blcok is better, it has a better oil delevery system, has the ability to revv higher, is ALOT stonger than the 5sfe crank, and has an 8-bolt flywheel pattern as opposed the the 5sfe 6 bolt pattern(8 bolt is pretty much the bare minimum for racing, 6 bolt is used to save money but cant handle as much stress)

block- the water jackets in the 3sgte blocks are larger, as well as the blcok is made of iorn, i hear all the time "why dont thye make all blocks alluminum becuase its lighter"
simple, cost and the fact of cooling
aluminum blocks NEED to be run at a lower temperature to be effective, iorn blocks can withstand alot more heat, i.e. if an all aluminum block heats up to much, it will warp very easily.


now if your trying to say both of them FULLY built, i would say 5s block, if you can replace the carnk to withstand higher revvs and get forged pistons and rods, then id say that. you must rememebr theres no replacment for displacment, thoertically if they both have (near) the same interals, oviously the 5s block will be better becuase of the displacment

now if I had to build both, id leave the stroke the same on the 3sgte, but id increase the bore to 82mm, forged pistons and rods, as well as get a crank that is very light, and can handle a high amount of revvs

with a 5sfe, i would DE-stroke it down to 2.0 or 1.9 liters (im more partial to high revving responsive engines) and get the forged stuff as well as the light crank w/ a 8 bolt flywheel pattern and be able to use 3sgte flywheels

the 5s block would be better if you had assloads of cash IMO becuase the ability to destorke it and make it a stoker engine, a
5s block stroked w a G head=pure sex