Street Terra 2027's are the ones I used. They are straight bolt on units with the increased 1.72 ratio, which will give you a little more lift on the stock cam. I think they are around $500, and should give you around 10-15rwkw I would imagine.
I also fitted a set of the yella terra ST2027's to my EL XR8. I can't tell you or a power increase on their own, as i fitted them at the same time i had the heads off for some porting.
Real easy to fit, and i didn't have any problems with fouling with anything else like rocker covers.
As far as price goes, i rang a few places when i got them, and they were cheapest if you brought direct from yella terra (in morrabbin if i remember correctly). One thing you might want to check if you buy from yella terra direct is to see if they have any "factory seconds" that Ford rejected. You see, these were the same rockers that were fitted to the later model XR8's, and Ford apparently had a pretty strict quality control policy. I think the set i got (which they mixed and matched from a few reject sets to get a good complete set) only cost me $360, compared to the $540 for 'perfect' set. I got these back in OCtober 02, and have had no problems with them yet (hopefully never). I don't know if these reject sets are still available, but if you're in the area, it might save you a few dollars.
Originally posted by EDXR8 Street Terra 2027's are the ones I used. They are straight bolt on units with the increased 1.72 ratio, which will give you a little more lift on the stock cam. I think they are around $500, and should give you around 10-15rwkw I would imagine.
Did you fit them yourself or did you have them professionally fitted?
I have never fitted rockers before. how hard is it and how long does it take? Ive pulled apart nearly every other thing on the car before but havent mucked around with engine components
I fitted them myself, it took a couple of hours, allow a full saturday though. The hardest thing, is that you have to take the upper intake manifold off to be able to remove the rocker cover.
By memory, you remove all pipes and wires running to the upper manifold, and remove the manifold. Remove the rocker cover, and then the rocker arms one at a time while there is no load on them. Oil the new roller rockers and put them in, again tightening them up with no load on the spring. Put the rocker covers and intake manifold back on, I actually had to remove the alternator, because the rocker covers wouldn't go back on with the alternator in place.
Originally posted by EDXR8 Street Terra 2027's are the ones I used. They are straight bolt on units with the increased 1.72 ratio, which will give you a little more lift on the stock cam. I think they are around $500, and should give you around 10-15rwkw I would imagine.
EDXR8
I didnt think rockers would give such an increase to my engine as it has stock cam and heads. Is that increase quoted above, with other engine mods needed or is that achievable with the current engine setup i have?
Firstly, the ST2027's increse the rocker ratio from 1.6 to 1.72 giving 33th more lift on the stock cam and about 2 degrees extra duration at 50th lift.
Secondly, and more improtantly, the roler rockers don't have anywhere near the friction losses that the standard rockers have. Some claim that over 15kw is lost purely in the friction of the standard rockers.
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Roller Rockers for 5ltr
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