Just put 70 miles on my new 400 SBC motor Roadster build and ended up fractured the piston ring land and was possibly caused due to hydrolock from my Blueprint motor mturn key Holley 750 CFM vacuum secondary’s screws backing out which in turn caused my float to stay open and flooding out the motor and causing the hydrolock condition! Ordered a brand new piston from Blue Print motor company with the same exact parts and weight of the original build! No damage to the cylinder wall plus this all happened when it was just idling and my motor just started to to have steam coming out of the crank case filter which led to a big difference in cylinder compression test! So pulled the motor apart and still in my car which was the easiest way! Got my car all back together and now running great with about another 20 miles on it! You would figure that they would have used mechanical vacuum secondary’s being a race motor! RoarsRods
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