perryh posted:Can someone give me a quick primer on what these are?
http://store.yellaterra.com.au...s-ratio-1-73-yt6015/
Do these bolt onto factory head pedestals? Is that with or without machining the ridge off of the pedestal?
And are these the same thing, but for applications that use a larger 7/16" bolt instead (or factory heads that have been tapped for a 7/16" thread)?
http://store.yellaterra.com.au...s-ratio-1-73-yt6321/
And the advantage of these over a stud mounted rocker is that is that they are simpler than a stud mounted rocker? Simpler how? Like the factory, but stronger with the ability to adjust and a lack of guide plates?
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Thanks!
The yt6321 are designed for the flat rocker pedestal with the 7/16" bolt holes. They come with pedestals with a pin hole which is then drilled through into the head with the tool that comes with them. When the pins are installed and rocker bolted to it, the rocker cannot rotate like a regular stud mounted rocker. No pushrod guide plates are required. I am not sure where I purchased mine, maybe Amazon years ago.
Check out this thread . I am not sure why I cannot insert a link to another forum but maybe try copying and pasting this link in a browser...
the351cforum.com/viewtopic.php?f=6&t=342
Someone was also asking about rockers for heads with the 5/16" bolt holes and ridges, it mentions RM Competition which could work out for you though it does not mention the bolt size on their webpage. Not sure if the yt6015 locks the rocker down from rotating like the yt6321, not sure if the RM Competition one does either. http://www.rmcompetition.com/rocker-arms-.html
CNC Motorsports seem to have Yella Terra listed, I bought stuff from them before. Other vendors may carry these also.