you know i had to take the fuel pump and driveshaft out as it went beserk and bent itself , i made a plug out of it with a washer welded to it . i wonder if it's too long and getting slapped around and making the noise ??? HMMMMMMMM...... last time i had the intake off it had come out and i cant recall hearing the knock then , but the oil pressure was weak , snowking you good sir are a genius , i'da never thought about that !!!!!!!!