Lets make a Yaris Real Fast.....

[yaris2010RS]

the rating on the block i got from toyota, maybe its just their recomandation but i dont understand y they would low ball it. i have no idea, i dont race any cars on a track or professionally. i've seen engines fail and i have also seen blocks fail. it usually has more to do with lack of care and maintanance then too much HP. as i said in my post also, i am under the influence the rating is on the block itslef not internal parts. if you decided to put turbo, nitro, and what ever other riced out shit you could think of without rebuilding the entire motor your gonna be into problems. and i dont know about your GN but the regal has a 3.8 v6 auto tranny is rated with stock motor and tranny not to go in "over excess"(over excess is the exact wording that i was told) of the block rating of 340ish (i dont exactly remember if it was low or high 340's)

so after saying that, let me rephrase my statement, the engine rating of the yaris stock 1.5L is 168HP, over that without a complete engine project will definatly give you a new engine project.