Yella Terra Twin shaft vs "bolt on" rockers
04-23-2012, 01:31 PM
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Yella Terra Twin shaft vs "bolt on" rockers I've been looking at various rockers for the past few days, and have decided that the Yella Terra Ultralites look like the way to go for my application. I'm undecided on the "bolt on" version , or the twin-shaft version.
What are the pros/cons of these two choices?
What are the pros/cons of these two choices?
04-23-2012, 05:17 PM
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No...the 6638 is a bolt on. I was thinking that the 6638 would be easier to set individual swipe, and that the 6640 (twin shaft) would be more of a "compromise" on swipe pattern between the two valves. Any thoughts?
04-23-2012, 06:19 PM
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Yeah, the 6640's are an adjustable twin shaft setup....the 6638's are an adjustable "bolt on"/stud style...like how the factory ones bolt on.
My main concern is being able to get the swipe perfect. The added stability of the shaft-mounted setup would just be GREAT if I was able to get it all dialed in the way that I want it.
My main concern is being able to get the swipe perfect. The added stability of the shaft-mounted setup would just be GREAT if I was able to get it all dialed in the way that I want it.
04-23-2012, 06:42 PM
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Indeed, but I'm wanting adjustable rockers...so the 6640's appear to fit the bill. I'm going to be building another engine in the somewhat-near future, and will want the option to transfer them to that build.
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04-23-2012, 06:56 PM
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Yeah, the 6640's are an adjustable twin shaft setup....the 6638's are an adjustable "bolt on"/stud style...like how the factory ones bolt on.
My main concern is being able to get the swipe perfect. The added stability of the shaft-mounted setup would just be GREAT if I was able to get it all dialed in the way that I want it.
My main concern is being able to get the swipe perfect. The added stability of the shaft-mounted setup would just be GREAT if I was able to get it all dialed in the way that I want it.
Sorry but I think you're wrong, I have yet to find anything that states that the 6638's bolt on individually, but plenty that states the 6638's are shaft mounted just like the 6640's are. So then I'd just get the 6638's unless you need that additional strength to run up to 500lbs springs.
Last edited by 99Bluz28; 04-23-2012 at 07:15 PM.
04-23-2012, 07:16 PM
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Sorry,but I think you're wrong, I have yet to find anything that states that the 6638 bolt on individually, but plenty that states the 6638 are shaft mounted just like the 6640's are. So then I'd just get the 6638's unless you need that additional strength to run up to 500lbs. springs
