personally i dont think a little gas in the crank case is going to cause that big of a deal. 1.import blocks seem to be a little stronger than american engines. 2. in the industry i work in we see a lot of strange failures from engines windowing the block to easy stuff like fuel pumps leaking fuel into the crank case. or even engines running on as little as a 1/2 quart of oil. because idiots dont check they're oil or gauges. unless they ran it for a extended period of time on gas/oil its probably ok. but if you've already got the engine disassembled then check the crank shaft, cylinder walls, and camshaft for any scoring gouges or abnormal wear. any doubt replace it!
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