660 plus rockers
Thread Starter
TECH Apprentice
Joined: Oct 2015
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660 plus rockers Cant make up my mind. Hoping to get some pros and cons.
Comp cams bsr new shaft rockers vs yella terra rockers.
400# spring pressure 660 lift cam cathedral prc heads. Help me choose. I am really leaning toward the bsr rockers.
Comp cams bsr new shaft rockers vs yella terra rockers.
400# spring pressure 660 lift cam cathedral prc heads. Help me choose. I am really leaning toward the bsr rockers.
Thread Starter
TECH Apprentice
Joined: Oct 2015
Posts: 310
Likes: 24
No I am more confused. Whats the point of the BSR shaft rockers if the ultra pros are better and cost less?
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Once you switch to a heavier rocker, you have to determine whether or not stiffer valve springs will be needed.
The nose weight of the rocker over the valve tip slows down the valve closing, so you usually need different springs.
This is why I'm not a fan of the Yella Terras and many other aftermarket rockers.
They are very heavy compared to the stockers. Unless they are absolutely needed due to lift, they are a step in the wrong direction.
The BSR rockers are very very nice pieces.
The Ultra Pros are only available in 1.8:1 ratio from what I remember, so putting them on any cam over .590 lift will increase the lift to a point where a roller tip would be required in the first place.
The nose weight of the rocker over the valve tip slows down the valve closing, so you usually need different springs.
This is why I'm not a fan of the Yella Terras and many other aftermarket rockers.
They are very heavy compared to the stockers. Unless they are absolutely needed due to lift, they are a step in the wrong direction.
The BSR rockers are very very nice pieces.
The Ultra Pros are only available in 1.8:1 ratio from what I remember, so putting them on any cam over .590 lift will increase the lift to a point where a roller tip would be required in the first place.
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Verdad Gallardo A good many LS7 guys are using them with good results, mine are not actually on yet. As for valve float, run stronger springs. I swapped to PAC1209x's. Their tip weight is a hair more.
[QUOTE=AwesomeAuto;20190880]Once you switch to a heavier rocker, you have to determine whether or not stiffer valve springs will be needed.
The nose weight of the rocker over the valve tip slows down the valve closing, so you usually need different springs.
This is why I'm not a fan of the Yella Terras and many other aftermarket rockers.
They are very heavy compared to the stockers. Unless they are absolutely needed due to lift, they are a step in the wrong direction.
The BSR rockers are very very nice pieces.
The Ultra Pros are only available in 1.8:1 ratio from what I remember, so putting them on any cam over .590 lift will increase the lift to a point where a roller tip would be required in the first place.[/QUOTE
YT rockers are indeed heavier than Oem units but it’s the over the nose weight that matters. My YT rockers on my MMS 265’s are only 10 grams heavier over the nose, verses on OEM LS7 rocker. I’m very weight conscious and I weigh everything. I’m not going to get into a rocker arm argument here, but your “very heavy” statement could easily be misleading.
The nose weight of the rocker over the valve tip slows down the valve closing, so you usually need different springs.
This is why I'm not a fan of the Yella Terras and many other aftermarket rockers.
They are very heavy compared to the stockers. Unless they are absolutely needed due to lift, they are a step in the wrong direction.
The BSR rockers are very very nice pieces.
The Ultra Pros are only available in 1.8:1 ratio from what I remember, so putting them on any cam over .590 lift will increase the lift to a point where a roller tip would be required in the first place.[/QUOTE
YT rockers are indeed heavier than Oem units but it’s the over the nose weight that matters. My YT rockers on my MMS 265’s are only 10 grams heavier over the nose, verses on OEM LS7 rocker. I’m very weight conscious and I weigh everything. I’m not going to get into a rocker arm argument here, but your “very heavy” statement could easily be misleading.
Don't the stock rockers always wipe out the valve tip at over .62x lift due to scrubbing of the valve tip? Did they do anything on the BSR's to fix that?
I always thought the recommendation was to go roller tip over 620 lift..
I always thought the recommendation was to go roller tip over 620 lift..
The YT’s were light when they first came out. But they began breaking. Happened to me. Motor with a busted exh rocker becomes very pissed off.
The design they have now is obviously heavier. I have them on my AFR headed LS1.
Seat of the pants said I lost power past 6500. Already had the better AFR Springs and titanium retainers.
They are noisy as well. No failures though.
THe BSR shaft setup looks nice. Personally, I’d add oil feed. Late model Hemi uses bronze bushed shaft rockers and I’ve never seen a failure.
Will be interesting how how they fare after time. Seems other solutions for the stock rockers end up with issues. I’m replacing my Comp trunions as we speak. Tooley V2 setup.
Ron
The design they have now is obviously heavier. I have them on my AFR headed LS1.
Seat of the pants said I lost power past 6500. Already had the better AFR Springs and titanium retainers.
They are noisy as well. No failures though.
THe BSR shaft setup looks nice. Personally, I’d add oil feed. Late model Hemi uses bronze bushed shaft rockers and I’ve never seen a failure.
Will be interesting how how they fare after time. Seems other solutions for the stock rockers end up with issues. I’m replacing my Comp trunions as we speak. Tooley V2 setup.
Ron
Usually you are required to mill the rocker stands to change the geometry. I run .650" with stock rockers, no issues.
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Lowering the rocker changes the peak lift valve-to-nose contact point putting it back in a safer area.
OP, you may wanna check the geometry or give comp a call and see if those BSR's are gonna work with your lift. If not, maybe the texas speed OE style rollers are the ticket.
OP, you may wanna check the geometry or give comp a call and see if those BSR's are gonna work with your lift. If not, maybe the texas speed OE style rollers are the ticket.
Last edited by 00pooterSS; Jan 6, 2020 at 04:28 PM.
Or the stands that go between the head and the rocker?
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The removeable stands. You can't just mill them with a flat because of the alignment tabs on opposing corners. You use a CNC mill to remove material from the flat portion that sits against the head.