Thread: 468 Big Block Noise

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the pistons are hitting the heads ? valve hitting the pistons ?? you did not say what heads you have but if o ports with a closed chamber pistons like a old trw then they will hit on the EX side of the dome or a je/srp or others big dome with the older iron open chamber heads they can hit to. as for solid cams on the street i have used solid rollers and flat lifter cams for over 20 years . you do not have to just them all the time two times a year or less i check them .the only time things change is if you wipe a cam or bend some parts or valve train is wearing out