Rockers for 0.611" lift
08-20-2013, 11:13 AM
#1
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Rockers for 0.611" lift Hey all,
Was curious. I have heard / read that stock lifters do not have a very friendly force angle on the valve guides when used above 0.500 lift. What are you all using for your cam swaps up to about 0.611" +?
I am not looking for the engine to last a million miles. I can care less if at 100,000mi my valve guides are toast due to extra loading from the stock rockers... but if it causes issues after 1,000 then that is an issue.
I would PREFER to use the stock rockers + trunion upgrade kit due to lower cost as I am not looking to spend a ton.
Was curious. I have heard / read that stock lifters do not have a very friendly force angle on the valve guides when used above 0.500 lift. What are you all using for your cam swaps up to about 0.611" +?
I am not looking for the engine to last a million miles. I can care less if at 100,000mi my valve guides are toast due to extra loading from the stock rockers... but if it causes issues after 1,000 then that is an issue.
I would PREFER to use the stock rockers + trunion upgrade kit due to lower cost as I am not looking to spend a ton.
08-20-2013, 12:43 PM
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Kind of what I figured. I know the stock rockers are pretty damn tough and nice and light to boot. Sure they aren't *full roller* but close enough for what I am doing.
Will they make a lot of noise? Or is that more from the aftermarket roller offerings?
Will they make a lot of noise? Or is that more from the aftermarket roller offerings?
08-20-2013, 12:45 PM
#4
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Somebody told you wrong fella. Stockers don't start scrubbing the valve tip till .625ish from what I've heard. Notice a TON of cams are spec'd under that lift??
08-20-2013, 01:17 PM
#6
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Pretty much ANY cam that you see... until you start getting into the ones that are useless powerbands to use on a street motor.
Makes sense to me! I appreciate the feedback a TON. Ask more questions, do more research, save more $ that's not spent foolishly.
And for sure, post up your results, very curious to see them! Whats your seat pressure?
Makes sense to me! I appreciate the feedback a TON. Ask more questions, do more research, save more $ that's not spent foolishly.
And for sure, post up your results, very curious to see them! Whats your seat pressure?
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08-20-2013, 02:05 PM
#8
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I am not looking for any more rpm than that so that is very good news for me. Those are also the same springs I am looking into ordering when I do my cam swap that you have listed in your sig (if it is still accurate). Any regrets?
08-20-2013, 03:14 PM
#12
Not super rare. Possibly overhyped. Most of the failures on Comp Trunions are from install error or lobes that are too aggressive for stock rockers.
CHE makes a bronze bushed bearing that they use instead of needle bearings (stock) or captured bearings (Comp et al). $400 for them to install in your rockers or 650 for new rockers with them installed. That's if you exceed the performance of the captured bearings.
Anyway, around .630" of lift is about as far as I'd take the stock rocker.
Btw, most of the OE failures are in LS3 with the offset rocker or LS7 with the 1.8:1 ratio rockers. Both seem to put more stress on the OE trunion.
CHE makes a bronze bushed bearing that they use instead of needle bearings (stock) or captured bearings (Comp et al). $400 for them to install in your rockers or 650 for new rockers with them installed. That's if you exceed the performance of the captured bearings.
Anyway, around .630" of lift is about as far as I'd take the stock rocker.
Btw, most of the OE failures are in LS3 with the offset rocker or LS7 with the 1.8:1 ratio rockers. Both seem to put more stress on the OE trunion.
08-20-2013, 03:16 PM
#13
I have done at .649/.609 w the Comp Trunions upgrade AND a Ls7 Stock Rocker w Comp Trunions upgrade and the Cam in that was .670/.670 Lift
Now running the Comp Trunions in my Ls2 Zo6 C5 car w a .601/.602 lift cam
Never had a Comp Trunions come apart or any issues w any of these 3 set ups......all ran 6800-7200RPM and I
all 3 Cars like they owed me $$$$$$$$$
Now running the Comp Trunions in my Ls2 Zo6 C5 car w a .601/.602 lift cam
Never had a Comp Trunions come apart or any issues w any of these 3 set ups......all ran 6800-7200RPM and I
all 3 Cars like they owed me $$$$$$$$$
08-20-2013, 03:49 PM
#14
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The lobe would really affect the wear and tear for sure. Some of those ramps are really not made with longevity in mind. The cam I am looking at is 0.611" lift max and I wont be spinning much past 6500 (unless someone pisses me off and I'm not thinking and go to 7).
99% of the time will be under 6500 with dual spring and not very aggressive lobes. Been really looking at that streetsweeper-ht cam. If I can save the $ on the rockers and assembly then I can put the $ elsewhere better spent! I am thinking put the $ into a better set of pushrods... also keep stock lifters? (L33 has the newer revised lifters I believe)
99% of the time will be under 6500 with dual spring and not very aggressive lobes. Been really looking at that streetsweeper-ht cam. If I can save the $ on the rockers and assembly then I can put the $ elsewhere better spent! I am thinking put the $ into a better set of pushrods... also keep stock lifters? (L33 has the newer revised lifters I believe)
08-20-2013, 04:07 PM
#15
Every Cam install w stock lifter has worked fine for me, there is some ticking noise from the lifters and thats normal, even the Ls7 lifters Tick w tha bigger lift cam shaft...
Only set of lifters I personally didnt have tick, was my LSX Ls7 Headed 427ci, Cam was .670/.670 251/252 113LSA build that I used a set of Lunati Link Bar Lifters in, $380 but that motor was quite and w that big of a cam I didnt see that coming lol
also haven the wrong length Push Rods w cause Lifter Tick also
Only set of lifters I personally didnt have tick, was my LSX Ls7 Headed 427ci, Cam was .670/.670 251/252 113LSA build that I used a set of Lunati Link Bar Lifters in, $380 but that motor was quite and w that big of a cam I didnt see that coming lol
also haven the wrong length Push Rods w cause Lifter Tick also
Last edited by 1999Firehawkls7; 08-21-2013 at 10:40 AM.
08-20-2013, 04:10 PM
#16
The StreetSweeper cams don't have gentle lobes. That's why they make a **** ton of power. Lift matters very little in how aggressive a lobe actually is. The SSHT will wail on your valvetrain. Just be aware of that and plan accordingly.
And I'd run a stock lifter under two circumstances: stock cam or a valvetrain setup as follows: lightweight valves, lightweight rockers (Stock), really beefy pushrods (3/8" if you can fit them), and soft ramp cam. Otherwise, they aren't all that great...
And I'd run a stock lifter under two circumstances: stock cam or a valvetrain setup as follows: lightweight valves, lightweight rockers (Stock), really beefy pushrods (3/8" if you can fit them), and soft ramp cam. Otherwise, they aren't all that great...
08-22-2013, 12:24 AM
#18
it was .600 then .630 So now .6111111 is the latest number? So over that, the rocker pulls the guild right out of the head? So what about the bone stock engines that have rocked tip or guild wear and those super mild setups, could it be the oil?
whats about all the thousands of cams for the last 10+ years with with .630+ on stock rocker stuff thats fine??
whats about all the thousands of cams for the last 10+ years with with .630+ on stock rocker stuff thats fine??
08-22-2013, 08:08 AM
#20
it was .600 then .630 So now .6111111 is the latest number? So over that, the rocker pulls the guild right out of the head? So what about the bone stock engines that have rocked tip or guild wear and those super mild setups, could it be the oil?
whats about all the thousands of cams for the last 10+ years with with .630+ on stock rocker stuff thats fine??
whats about all the thousands of cams for the last 10+ years with with .630+ on stock rocker stuff thats fine??