Hi All,

Generally speaking, I know that pistons designed to work with conventional BBM heads like (Indy 440-1) need some valve pocket machining to work with B1 original heads. Can anyone tell me about the opposite? Will pistons designed to run on a BBM B1 original headed BBM work with a 440-1 head or do they also need machining? I'm thinking of cam lifts less than .700 .

Thanks!