iv looked everywere for info on this. 4k have valve springs that are 70lb and 5k use 77lb springs, i can get 5k ones for free but want to know if they will fit in the 4k and 3k seats?. :D

get them, measure them, there's your answer?

 

I've only got dismanteled 5ks, so I couldnt tell you.

i also have a cracked 4k-u head, the dished piston type head, would these have 5k spring in them cos a 5k sometimes has dished pistons so does anyone know the fact behind this? point is if they are the same than sourly the 5k springs will fit in a 4k.

Edited May 14, 200818 yr by [email protected]

Yes they definitely fit. I used to run them on my old 4K.

sweet now alls i have to do is buy a new valve clamp, my old one was left outside for a few weeks when i lost it and it rusted up and went all shit on me lol.

save yourself the trouble and buy a new set mine cost $90 from performance springs my highly modded 4k hits 8500 rpm no bounce at all for the record they seat at 90lb the part number is cb4a-8 hope this helps ya!