umm depending on what kind of roller rockers you want, if you want studs be prepared to pay more, I paid close to 1000$ canadian for a pair of completely rebuilt cast heads with bolt in studs and pushrod guide plates. along with this you'll need a set of hardened pushrods(45$ cnd) and the rockers as well(350+ $ cnd), there are also stock replacement roller rockers which require no machining at all to install then the only cost to you would be the cost of the rockers (prolly between 200-350$ cnd)
I personally reccomend the bolt-in studs because they are stronger and can handle higher spring pressures and taller cam profiles, without the risk of breaking. anywho thats my 2 cents. Sean
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