Rocker Studs
#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.
#4
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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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#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?
#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?
#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.
#13
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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....
#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.
#17
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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.
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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.
Again, Its not something I worry about when going to the track, those stockers can handle alot more than you may think.
#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.
#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.