thanks, ya ive done alot of research on cams and some how i overlooked that there are non solid lift r5 cams. nobody seems to post any info on how they run. i did end up ordering the hd springs and viton seals yesterday.so far ive heard that the r400 and plus dont seem to have that much diff from stock. i just dont see that possible im not sure if people are talking out there asses or what. im trying to feel out how the r500's will corrisponde with a higher tuned motor.