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i have brought a rb25det head no rockers just the head/ cylinders,

my question is how do i confirm by just looking at he head if it is series 1 or 2

the guy i brought it off said its had valve springs upgraged to tomei, but the only tomei springs i can find are the one size and i have been told by spool that series 2 springs are 2 diff sizes?

how do i work this out for sure so i can buy the right cams..

i couldnt find anything to help with difference in the heads.

if there is a link pls post

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