I had one of those sirio motors a year ago and I went through conrods like there was no tommorrow. Ovalized brass bushing and the crankpin on the crank was toast. Got tired of replacing conrods, so I came up with an awnser. Took it out of my car, and gave it away. My buddy got one of those $500 .12 modified Callari sirio motors. A half gallon later, toast ( with butter and jelly on top )