Went to Dragway 42 today and ...FIXED!!!
#1224569
04/29/12 10:55 PM
04/29/12 10:55 PM
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Joined: Feb 2010
Posts: 1,377 Ohio
Todd
OP
pro stock
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OP
pro stock
Joined: Feb 2010
Posts: 1,377
Ohio
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The first pass went [Email]11.60@115[/Email] 1.64 60ft. Then on the second pass engine felt a little flat and when I pulled up to get my time slip the engine sounded like it was missing. Get back to the trailer and it was definitely missing. So we loaded up and pulled the valve covers at home and found that #1 exhaust and #4 intake rocker arm adjuster was backed way off. These are Harland Sharp rockers. Has anyone else had this problem? The bottom side of the rocker where the adjuster goes though has some thread damage from the push rod.
Last edited by Todd; 05/02/12 03:50 PM.
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Re: Went to Dragway 42 today and got a new best, but...
[Re: Todd]
#1224570
04/29/12 11:04 PM
04/29/12 11:04 PM
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Joined: Jan 2004
Posts: 13,247 Mt. Vernon, Ohio
dartman366
I Live Here
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I Live Here
Joined: Jan 2004
Posts: 13,247
Mt. Vernon, Ohio
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Had a set of HS rockers on another smallblock once and had the same thing happen, took the adjuster out and run a tap thru and cleaned the threads and put the adjuster back in, I found I had not tightened the adjuster's that loosened up enough, snugged them just a little more and had no more problems.
Light travels faster than the speed of sound,,,this is why some people seem bright untill you hear them speak.
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Re: Went to Dragway 42 today and got a new best, but...
[Re: Todd]
#1224572
04/30/12 02:47 PM
04/30/12 02:47 PM
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Joined: Jan 2004
Posts: 13,247 Mt. Vernon, Ohio
dartman366
I Live Here
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I Live Here
Joined: Jan 2004
Posts: 13,247
Mt. Vernon, Ohio
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I know T@D calls for a torque value of 5 to 20 inch pounds, the problem is pulling the aluminum threads in the rocker body so I would call HS and have them give you an answer, looks like you still have 95% of the thread still there, I would tap them and run them.
Light travels faster than the speed of sound,,,this is why some people seem bright untill you hear them speak.
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Re: Went to Dragway 42 today and got a new best, but...
[Re: dartman366]
#1224573
04/30/12 03:01 PM
04/30/12 03:01 PM
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Joined: Jan 2003
Posts: 19,372 Las Vegas
Al_Alguire
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I Live Here
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Posts: 19,372
Las Vegas
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Yep I would concur that it is just a case of not enough torque on the adjuster nut. Plenty of meat left there I would not hesitate to run it. I could show you want we did just running it on jackstands in the pits this weekend. Much uglier than what you ahve there.
"I am not ashamed to confess I am ignorant of what I do not know."
"It's never wrong to do the right thing"
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Re: Went to Dragway 42 today and got new best but...see pic
[Re: Todd]
#1224575
04/30/12 07:18 PM
04/30/12 07:18 PM
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Joined: Apr 2005
Posts: 1,505 TN
SCATPACK 1
pro stock
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pro stock
Joined: Apr 2005
Posts: 1,505
TN
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YEP Yep Yep... Had identical problem with Harland Sharpe Rockers. I think they went thru a bad batch of adjustors and we had issues until we replaced ALL of the adjustors and lock nuts. Alhough my cousin just went thru the same issue on one of his intake rockers this weekend, I STILL believe they are the best rocker arms for a Mopar. Just my opinion. Good luck
Old Geezer Racing
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Re: Went to Dragway 42 today and got new best but...see pic
[Re: 383man]
#1224578
05/01/12 01:20 AM
05/01/12 01:20 AM
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Joined: Aug 2009
Posts: 2,047 Mooresburg, Tn
'72CudaRacer
top fuel
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top fuel
Joined: Aug 2009
Posts: 2,047
Mooresburg, Tn
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You need to be very carefull choosing a tap to clean this up. Get a very good one, not el-cheapo tap. I found this out the hard way. Actually, you would be better off taking a good new grade 8 3/8x24 bolt and cutting a slot up to about the 4th thread and clean out the rocker arn with it. I tried to fix a rocker at the track one time and borrowed a cheap tap and it cut the threads so loose that the adj bolt just wobbled around in the rocker. Just my 2 cents worth. Brian Dunnigan
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Re: Went to Dragway 42 today and got new best but...see pic
[Re: Todd]
#1224581
05/01/12 09:31 AM
05/01/12 09:31 AM
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Joined: Jan 2003
Posts: 13,369 Marion, South Carolina [><]
an8sec70cuda
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 13,369
Marion, South Carolina [><]
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Like everyone else said, only time I've had that happen w/ my Harland Sharps was when I didn't get the adjuster tight enough. I ran a tap through it, put it back together, and haven't had any trouble since.
CHIP '70 hemicuda, 575" Hemi, 727, Dana 60 '69 road runner, 440-6, 18 spline 4 speed, Dana 60 '71 Demon, 340, low gear 904, 8.75 '73 Chrysler New Yorker, 440, 727, 8.75 '90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt '06 GMC 2500HD LBZ Duramax
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