stock style rocker arms.
07-27-2011, 05:17 PM
#2
The stock rocker arms are marginal at best for a performance application...any cam bigger than stock I would step up to aftermarket roller rockers or you're asking for trouble, not to mention the easy HP gains of less friction and more lift with the 1.6 ratio...it's really a no-brainer to upgrade them if your doing a cam swap. 1.6rr are proven to gain 15-20 hp on even a stock motor.
07-27-2011, 06:01 PM
#3
The stock rocker arms are marginal at best for a performance application...any cam bigger than stock I would step up to aftermarket roller rockers or you're asking for trouble, not to mention the easy HP gains of less friction and more lift with the 1.6 ratio...it's really a no-brainer to upgrade them if your doing a cam swap. 1.6rr are proven to gain 15-20 hp on even a stock motor.
I've ran them at .530 valve lift with no issues at all. They are a stamped steel rockers, they are tough.
07-27-2011, 06:47 PM
#4
I have had the pushrods punch through the rocker with a 576 lift cam . Basically what happened was,the oil hole was the weak link and the pushrod went through.
A 530 cam is not that big at all..... All in all roller rockers are the best route to go for performance applications.
A 530 cam is not that big at all..... All in all roller rockers are the best route to go for performance applications.
07-27-2011, 07:53 PM
#6
i would imagine the added stress of upgrading the springs on the valve side is what makes it a problem. And with more lift useually comes higher spring pressure. Not sure its really worth wondering about if you plan to actually make power lol.
I guess if you don't want to turn any decent RPM or your building a truck motor or some **** they're just fine
07-28-2011, 07:33 PM
#12
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Wow can't even get a straight answer....
But hey, just for ***** and giggles,
Lets say a person is building on a budget/time frame.
1- have a cam installed.
2- for some reason they didn't buy RR.
3- they are finishing/putting the motor together
4- they have to drive it within two days, and can't afford expedited shipping on RR.
5- they now have RR on the way but still need/have to drive it in two days.
6- How much lift can the stock rockers handle for lets say three days until the RR get there.
7- they have a set of (for our typical set-ups purposes) comp 918 springs.
These seven points are to fill any questions or debates about whether they shouldn't use stock rockers because of longevity/efficiency issues. SO NO RR debates. The issue of using RR is not being debated!!!!!!!!!
(disclaimer- this COMPLETELY fictional. any connection/relevance to any one persons build is completely coincidental)
But hey, just for ***** and giggles,
Lets say a person is building on a budget/time frame.
1- have a cam installed.
2- for some reason they didn't buy RR.
3- they are finishing/putting the motor together
4- they have to drive it within two days, and can't afford expedited shipping on RR.
5- they now have RR on the way but still need/have to drive it in two days.
6- How much lift can the stock rockers handle for lets say three days until the RR get there.
7- they have a set of (for our typical set-ups purposes) comp 918 springs.
These seven points are to fill any questions or debates about whether they shouldn't use stock rockers because of longevity/efficiency issues. SO NO RR debates. The issue of using RR is not being debated!!!!!!!!!
(disclaimer- this COMPLETELY fictional. any connection/relevance to any one persons build is completely coincidental)
07-28-2011, 08:17 PM
#13
Under a crunch like that you would still want to watch the slot length. One of the b-body guys snapped a couple stock rocker studs with .510 lift because the geometry was such that the slot was bottoming on the stud. gregrob reported above having used stockers to .530 which supports the theory that the b-body guy had some bad geometry going on to cause his problems.
So my opinion is check the geometry, if that is OK you are fine at least short term.
Someone else mentioned spearing a pushrod through a rocker arm, a friend did that on a budget built street racing car with the LPE 211/219 cam which is .530/.560 another instance of high lift on stock rockers.
So my opinion is check the geometry, if that is OK you are fine at least short term.
Someone else mentioned spearing a pushrod through a rocker arm, a friend did that on a budget built street racing car with the LPE 211/219 cam which is .530/.560 another instance of high lift on stock rockers.
07-28-2011, 09:26 PM
#14
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Under a crunch like that you would still want to watch the slot length. One of the b-body guys snapped a couple stock rocker studs with .510 lift because the geometry was such that the slot was bottoming on the stud. gregrob reported above having used stockers to .530 which supports the theory that the b-body guy had some bad geometry going on to cause his problems.
So my opinion is check the geometry, if that is OK you are fine at least short term.
Someone else mentioned spearing a pushrod through a rocker arm, a friend did that on a budget built street racing car with the LPE 211/219 cam which is .530/.560 another instance of high lift on stock rockers.
So my opinion is check the geometry, if that is OK you are fine at least short term.
Someone else mentioned spearing a pushrod through a rocker arm, a friend did that on a budget built street racing car with the LPE 211/219 cam which is .530/.560 another instance of high lift on stock rockers.
07-28-2011, 10:18 PM
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oh BTW the original question had nothing to do with his setup. I was just wondering?!?!?!
10-25-2012, 10:11 AM
#17
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Stock rockers with the trunnion upgrade work great. I am running a .621 lift cam in a 660hp LS3 that I rev to 7400rpm. I daily, drag, and road race the car. I have had zero issues for over 2 years.
I have taken the car on countless trips.
The car runs 10.50s @ 135mph on street tires very consistently.
cheers,
Ryan
I have taken the car on countless trips.
The car runs 10.50s @ 135mph on street tires very consistently.
cheers,
Ryan
10-25-2012, 10:18 AM
#18
Stock rockers with the trunnion upgrade work great. I am running a .621 lift cam in a 660hp LS3 that I rev to 7400rpm. I daily, drag, and road race the car. I have had zero issues for over 2 years.
I have taken the car on countless trips.
The car runs 10.50s @ 135mph on street tires very consistently.
cheers,
Ryan
I have taken the car on countless trips.
The car runs 10.50s @ 135mph on street tires very consistently.
cheers,
Ryan
10-25-2012, 10:47 AM
#19
Stock rockers with the trunnion upgrade work great. I am running a .621 lift cam in a 660hp LS3 that I rev to 7400rpm. I daily, drag, and road race the car. I have had zero issues for over 2 years.
I have taken the car on countless trips.
The car runs 10.50s @ 135mph on street tires very consistently.
cheers,
Ryan
I have taken the car on countless trips.
The car runs 10.50s @ 135mph on street tires very consistently.
cheers,
Ryan
