yep the short stroke of the 1jz saves it from as much friction as the 7m's longer stoke,the 1jz's shorter stroke slows the piston speed ,lowering piston friction,making the engine more durrable for higher reving racing conditions.7m's are good engines but with their longer stroke ,produce more piston speed thus more friction.this construction makes the 7m a cut below the 1jz.not only does the 1jz beat the 7m with power numbers(50 hp is alot when twins spool twice as fast as single turbo,and when you don't have that 50 hp that the other guy has you get better at reading his bumper stickers)1jz-gte has a better oiling system than the 7m-gte too.when building a high horse power engine the 1jz also has the the 7m beat with it's bottom end construction,you will have to upgrade the stock toyota internals of the 7m to make it dependable at 400+ hp.this is not so for the 1jz,as you say the 1jz rods fail at around 500-600 hp.toyota raleased the supra type r with the 1jz-gte for a reason,it's better than the 7m,they did not put the type r out with the 7m because it is not as good as the 1jz,if it was as good as the 1jz they would have installed the 7m engine in the type r.after all a type r is only deserving of the best technology that the manufacturer can produce.i also own a 7m-gte,have blown it up several times,have built it up several times too ,so i'm able to make an informed descision.the 7m engine i build is strong as hell and maintinence on my vehicles is second to none as i'm a racer and change all fluids(and anything else that needs repair) after any hard driving is done.maintinence is always one of the limmiting factors of any engine.my 7m engine is my 1jz's replacement when engine work is needed and i'll say it is a damn fine temp,like having joe montana as the quarterback,he gets injured,and his replacement is john elway.there is no way to loose i use them as a team.there are always cons though,it;s hard as hell to find reasonably priced parts(if you can find them at all) for the 1jz.
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