What gain do you expect by fitting Rollers to a standard motor. Money can be spent in other areas for better return. You will gain 1 to 5HP max won't even notice it for $300.00 plus your time to fit. Put a decent exhaust or a better carb at least you will hear the change even if you can't feel the difference. New Cam perhaps. Shop around before you part with the cash talk to some motor builders. Sunburst
� If you need srew in studs the head will need to come off and go to the shop for post removal machine the post bases and tap the thread,
(Heath)
Yes that is if you need screw in studs, but I don't think Brad would bother with rockers with that requirement on an otherwise standard motor (correct me if i'm wrong mate).
Ive already done carb/manifold/headers/exhaust/ignition, other than 10.2-5 ish compression its internally stock. A new cam maybe but it is a daily driver, so an engine that runs smoother and a bit more economically is a bonus too.
Why does the head need modification? I was presuming that the studs substituted the rocker arm bolts then rocker then posi lock on top. If i have to take the head off then i would more consider having the head ported instead.
Hi Brad, I misunderstood your first post re standard motor, Rollers would be the next logical step for Bolt On Preformance, yes it is smoother, yes it revs more freely (Sound is slick), there is small gains to be made (every bit helps). Another gain is less wear on engine parts if adjusted properly. You will get use to running the feeler gauge through them every service. YT Street Terra 2007 will fit the 3/8 shaft, 3/8 shafts were prone to loosening as they are press fitted to the head. Problem in a hard reving motor, Preformance mod was to pin the post in the head (XU1 Mod). ST 2007s come with Posi locks and fit under the rocker cover. Head will only need to come off if you use the more expensive roller rockers with a 7/16 shaft mount, I believe old shaft gets removed, base of the post gets machined then drilled and tapped, then you put 7/16 posts in or use the "You Beaut" screw down twin shaft joined rollers YT Platinum Series . Sunburst
PS more to the point re 1.6 or 1.5 the standard units are 1.5 but I would speak to an engine builder re using a higher ratio, I have heard of using one of each but can't remember what one was inlet and what one was exhaust.
Edited by sunburst_metalic, 08 February 2008 - 05:00 PM.
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