Quote:
Originally Posted by battle_240sx
it dont sound link the lifters it more like a hard tap. the moter did sit for a year. when we first started the motor it ran fine just a little miss but it was due to my old spark plugs but we fixed that and a bad alt. then the noter started to make the noise. ive been looking all day and cant get a answer about the rb20 being a interference motor or not. you seem like the person to know when it comes to rb's so thanks for all of you help
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Bent valves have a distinct sound, like metal on metal, way different than stuck lifters. RBs are interference motors too.