Rocker Studs
07-15-2008, 10:43 AM
#1
Breaking Rocker Studs What are the chances of breaking a 3/8's inch rocker stud with the lpe 211/219 cam, self-aligning 1.6 comp pro mags and 99893 valve springs? I was told that the 402 lb/in rating on the springs was too high and it would probably break the stud.
Last edited by RallyBoy; 07-16-2008 at 12:35 AM.
07-16-2008, 10:16 AM
#4
i do not feel you will break any ARP stud,the lift is not high,the rpm is not excessive so you should be fine..
the reason for 7/16 studs is to increase deflection.stock metric and 3/8 studs generally flex a bit whereas the 7/16 are thicker and of course will not flex as easy. in turn, less flex will of course give you more accurate valve lift at RPM.
the reason for 7/16 studs is to increase deflection.stock metric and 3/8 studs generally flex a bit whereas the 7/16 are thicker and of course will not flex as easy. in turn, less flex will of course give you more accurate valve lift at RPM.
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07-21-2008, 08:32 PM
#8
I know the majority say NSA rockers and 7/16 studs are better but I really did not want to deal with the hassle of the guideplates since this is my daily driver. If I were doing the install I would feel more comfortable using guideplates since I would set them up perfect no matter how long it took. I also feel if I used guideplates that I would have to constantly check for wear on the guideplate and pushrod. I see that ARP makes a pro-series rocker stud that has more tensile strength than their high performance series rocker stud. Maybe this would be acceptable?
07-21-2008, 10:42 PM
#9
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Not meaning to hijack the thread but any one else out there with an educated opinion want to chime in? How about on a larger cam say a Comp xfi468 or a gm847 spinning to 6500-6800 rpm?
08-15-2008, 03:53 AM
#12
The guy that is putting the engine together says that the spring pressure is pushing it. I even called ARP and one of the gentlemen that I talked to said that I would be better off with the larger stud. Man, I hate I even started this engine build. I should have just kept it stock. I don't want to deal with the guideplate issue but I guess I'll have to take a chance.
08-15-2008, 08:37 AM
#13
I don't understand why you feel installing guide plates are a hassle,it alsmost seems as though you are intimidated by them.
I have used the LPE 219/219 on press-in stud heads on my old 91 z28,shifted at 6200 and never broke a stud.. Using the guide plates,hardened pushrods,7/16 studs and 7/16 1.6 RR made the combination much more durable....
I have used the LPE 219/219 on press-in stud heads on my old 91 z28,shifted at 6200 and never broke a stud.. Using the guide plates,hardened pushrods,7/16 studs and 7/16 1.6 RR made the combination much more durable....
08-16-2008, 01:48 AM
#14
ARP studs - flexing a tad bit at high rpm,,, maybe,,, Breaking on that cam,,, slim to no chance.
I'm 99% positive that LPE's package includes 3/8 studs with double valve springs and that cam... dont think they go 7/16.
Call up LPE and ask what studs they use on the LT1 CNC heads.
I'm 99% positive that LPE's package includes 3/8 studs with double valve springs and that cam... dont think they go 7/16.
Call up LPE and ask what studs they use on the LT1 CNC heads.
08-16-2008, 12:52 PM
#17
I ran a custom Cam Motions Hyd roller that was 245 @ .050 and .594 lift with Cam Motions springs on the stock 3/8" studs and GM LT4 HOT cam roller rockers( which are self aligning) for years. Racing on Nitrous, rev'ing to 7,000 rpm. You'll be fine with the stockers
I would suggest you verify you have enough clearance beneath the bottom of the rocker arm and the top of the spring retainer. If that's okay, you're golden.
I would suggest you verify you have enough clearance beneath the bottom of the rocker arm and the top of the spring retainer. If that's okay, you're golden.
08-16-2008, 01:37 PM
#18
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I ran a custom Cam Motions Hyd roller that was 245 @ .050 and .594 lift with Cam Motions springs on the stock 3/8" studs and GM LT4 HOT cam roller rockers( which are self aligning) for years. Racing on Nitrous, rev'ing to 7,000 rpm. You'll be fine with the stockers I would suggest you verify you have enough clearance beneath the bottom of the rocker arm and the top of the spring retainer. If that's okay, you're golden.
I would suggest you verify you have enough clearance beneath the bottom of the rocker arm and the top of the spring retainer. If that's okay, you're golden.Again, Its not something I worry about when going to the track, those stockers can handle alot more than you may think.
08-16-2008, 02:09 PM
#19
See man, I already sent the SA rockers back and ordered the NSA rockers and guideplates and studs. It only cost about $15 more dollars. I just feel I would have been happier with the SA rockers because I would not have to worry about guideplates, valve guides and all that other BS.
08-16-2008, 02:18 PM
#20
I ran a custom Cam Motions Hyd roller that was 245 @ .050 and .594 lift with Cam Motions springs on the stock 3/8" studs and GM LT4 HOT cam roller rockers( which are self aligning) for years. Racing on Nitrous, rev'ing to 7,000 rpm. You'll be fine with the stockers I would suggest you verify you have enough clearance beneath the bottom of the rocker arm and the top of the spring retainer. If that's okay, you're golden.
I would suggest you verify you have enough clearance beneath the bottom of the rocker arm and the top of the spring retainer. If that's okay, you're golden.