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Topic: Another Broken Rocker Arm Stud

in Forum: C3 Engines


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Another Broken Rocker Arm Stud

Posted: 7/26/06 4:51pm Message 11 of 19
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Adams' Apple
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Duncanville, TX - USA
Joined: 11/8/2003
Posts: 20214
Vette(s): #1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas
Well, ya, but... a fuel engine puts out 1500hp, but they still have to rebuild after every run! (jes messin wid ya! )

Hopefully, the change to the 7/16" studs will eliminate the problem. I gots my 9 3/4 fangers crossed!


btw...please don't think I am talkin trash about Am. Speed...just posing questions.


Joel Adams
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Another Broken Rocker Arm Stud

Posted: 7/26/06 6:17pm Message 12 of 19
rearn2go72
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Bladenboro, NC - USA
Joined: 1/22/2006
Posts: 1058
Vette(s): 1972 conv., sunfire yellow, blk interior, blk vinyl and convertible top. Off frame restoration with American Speed 383 stroker engine producing 500hp plus a 200hp NOS system. MSD ignition. Hooker super competition headers with chambered exhaust.

Joel,

No offense taken as to talking trash about Am. Speed. I really wanted to ask them myself why they use 3/8 studs if they know there's a problem with them. They have been too good to me...didn't want to embarrass Gayle. 

I got the new rockers and studs today. The studs appear to be about 3/16 longer than the old ones. I also got the specs on everything else so the mechanic can check it all as he makes the change.

Thanks for your input Joel. Time and high RPMs will soon tell.




Another Broken Rocker Arm Stud

Posted: 7/26/06 10:31pm Message 13 of 19
Kiltime
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Piscataway, NJ - USA
Joined: 10/16/2002
Posts: 106
Vette(s): 1973 coupe silver Eng.383 stroker. Tremec 5spd 1977 L48 Stock
  I too had arocker stud break with the same rockers. It fractured right at the poly lock. these studs came on the edelbrock heads.There was only about 3/8 of an inch it was holding buy. I felt this wasent enough. I ordered the longest arp studs and haven't had a problem. But I also thought maybe when I adjusted the valves I tightened the set screw to tight not just snug and added undue stress there. Now the set screw is up towards the top of the lock instead of down by the bottom. ARP# 134-7104Kiltime38925.502962963


Another Broken Rocker Arm Stud

Posted: 7/27/06 9:32am Message 14 of 19
VETTERBOB
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DUNEDIN, FL - USA
Joined: 10/22/2004
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Vette(s): 1969 COUPE CORTEZ SILVER, BRIGHT BLUE INTERIOR 383 cu. in. 512 HP. Hooker headers w/ side pipes PS PS AC AM FM STEREO. 68,000.MILES C5 5oth Anniversary Coupe , auto.350hp

When I built my 383  had my machinist drill and pin the rocker studs to  keep from moving  as the stock ones are just pressed in. Might help if they haven`t done that already.




Another Broken Rocker Arm Stud

Posted: 7/27/06 11:56am Message 15 of 19
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Adams' Apple
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Duncanville, TX - USA
Joined: 11/8/2003
Posts: 20214
Vette(s): #1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas
[QUOTE=VETTERBOB]

When I built my 383  had my machinist drill and pin the rocker studs to  keep from moving  as the stock ones are just pressed in. Might help if they haven`t done that already.

[/QUOTE]

We did that for years on our race-cars, and even street cars. However, Jim's heads have screw in studs.


Joel Adams
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Another Broken Rocker Arm Stud

Posted: 7/27/06 12:42pm Message 16 of 19
rearn2go72
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Bladenboro, NC - USA
Joined: 1/22/2006
Posts: 1058
Vette(s): 1972 conv., sunfire yellow, blk interior, blk vinyl and convertible top. Off frame restoration with American Speed 383 stroker engine producing 500hp plus a 200hp NOS system. MSD ignition. Hooker super competition headers with chambered exhaust.

Thanks for the ARP # there Jack. Unfortunately Jegs didn't have those listed when I placed my order, so I ended up with Crane. They cost double what the others ones they had listed cost, so I figured they might be better. Sometimes you're just paying for the name though.

 




Another Broken Rocker Arm Stud

Posted: 7/27/06 1:01pm Message 17 of 19
Kiltime
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Piscataway, NJ - USA
Joined: 10/16/2002
Posts: 106
Vette(s): 1973 coupe silver Eng.383 stroker. Tremec 5spd 1977 L48 Stock
 I had went to a retofit hyd roller and the mfg gave me the pushrod P/N I would need. The deck height was stock and I used Edelbrock RPM heads. Also full roller rockers But I thought the set screw was too far down in the poly lock at the time. The valve geometry check out ok. But with the longer studs, I feel more comfortable seeing the set screw more toward the top.  


Another Broken Rocker Arm Stud

Posted: 8/3/06 9:59am Message 18 of 19
jackmoore
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Posts: 38

I did notice we are talking about a solid lifter car.  Who set's the gap on the lifters, and do they set them stone cold? Sitting overnight? 

Careful  lifter gap monitoring may be in order.  A valve that streches can change a gap pretty quickly.  It may be a fluke, but was it the same stud that keeps breaking?  Maybe adjust those gaps more often and see if that one valve is streching faster/disproportinate to the others.




Another Broken Rocker Arm Stud

Posted: 8/3/06 2:10pm Message 19 of 19
rearn2go72
Former Member
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Bladenboro, NC - USA
Joined: 1/22/2006
Posts: 1058
Vette(s): 1972 conv., sunfire yellow, blk interior, blk vinyl and convertible top. Off frame restoration with American Speed 383 stroker engine producing 500hp plus a 200hp NOS system. MSD ignition. Hooker super competition headers with chambered exhaust.

Jack,

We're talking about an engine built by American Speed with less than 2000 miles on it. The engine was built, put on the dyno, torn back down and checked for any problems.

It was a different stud that broke. First was #7, last was #4.

  




in Forum: C3 Engines


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