Harlan sharp 1.7rr failure
Thread Starter
Melting Slicks
Joined: Aug 2002
Posts: 2,737
Likes: 2
From: California USA
Harlan sharp 1.7rr failure
Which RR are you guys using or recommend? I am about to put a monster cam in this motor and want a good set of RR. I will not use this type again. I would use the stock ones if I could, but these heads really don't work with them. Ideas?
What I found upon removing the valve cover:
What I found upon removing the valve cover:
Thread Starter
Melting Slicks
Joined: Aug 2002
Posts: 2,737
Likes: 2
From: California USA
Thread Starter
Melting Slicks
Joined: Aug 2002
Posts: 2,737
Likes: 2
From: California USA
Burning Brakes
Joined: Feb 2007
Posts: 1,037
Likes: 0
From: Kansas City Missouri
St. Jude Donor '09
None yet still waiting to get it. Just saying what was recommended to me. Something about the angle of the heads that roller rockers are the only option on TFS heads and that they only would recommend YTs.
Team Owner
Joined: Mar 1999
Posts: 22,025
Likes: 192
From: At the beach in little Rhody
How many miles on the Harlands? Aluminum in general has a much lower fatigue life than steel. With a stout setup, you may need to change them when valve springs are changed. I have only seen one or two Yella Terra failures, none with Crane, lots with Scorpions and quite a few Harland Sharps.
Jesel has a new steel shaft system out, beautiful design but I don't know the cost. Link
Jesel has a new steel shaft system out, beautiful design but I don't know the cost. Link
Last edited by vettenuts; Nov 30, 2008 at 08:49 AM.
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Team Owner
Joined: Jan 2004
Posts: 22,185
Likes: 65
From: NJ
I wouldn't necessarily blame the brand for the failure. HS is a decent brand with a good rep. Any part can go bad and all manufacturers have failure rates for new parts.
All that being said, Yella Terra seems to be the rocker of choice.
All that being said, Yella Terra seems to be the rocker of choice.
Thread Starter
Melting Slicks
Joined: Aug 2002
Posts: 2,737
Likes: 2
From: California USA
These look pretty good. Stud mount, adjustable, they fit under stock valve cover and they are $410. I wonder how well the polylocks stay fastened.
I forget which brand, but in the past had polylock rockers that I could not keep locked. I want to say I was using comp cams pro magnums w/solid cam and had this problem. Its looking more like YT's now. The bolt down rocker is just too easy.I hope I don't have pushrod length issues changing over.
Crane 1.7s
http://cranecams.com/?show=browsePar...ber=144750A-16
I forget which brand, but in the past had polylock rockers that I could not keep locked. I want to say I was using comp cams pro magnums w/solid cam and had this problem. Its looking more like YT's now. The bolt down rocker is just too easy.I hope I don't have pushrod length issues changing over.
Crane 1.7s
http://cranecams.com/?show=browsePar...ber=144750A-16
Last edited by 427CPE; Nov 30, 2008 at 01:23 PM.
Team Owner
Joined: Mar 1999
Posts: 22,025
Likes: 192
From: At the beach in little Rhody
These look pretty good. Stud mount, adjustable, they fit under stock valve cover and they are $410. I wonder how well the polylocks stay fastened.
I forget which brand, but in the past had polylock rockers that I could not keep locked. I want to say I was using comp cams pro magnums w/solid cam and had this problem. Its looking more like YT's now. The bolt down rocker is just too easy.I hope I don't have pushrod length issues changing over.
Crane 1.7s
http://cranecams.com/?show=browsePar...ber=144750A-16
I forget which brand, but in the past had polylock rockers that I could not keep locked. I want to say I was using comp cams pro magnums w/solid cam and had this problem. Its looking more like YT's now. The bolt down rocker is just too easy.I hope I don't have pushrod length issues changing over.
Crane 1.7s
http://cranecams.com/?show=browsePar...ber=144750A-16
Melting Slicks
Joined: Jul 2008
Posts: 2,151
Likes: 6
From: Oceanside Ca/ Tampa FL
Man , sorry to see this. My buddy has gone through 3 of them from Harlan. Bad Batch? I dont know , hes pretty pist but he got them replaced for free from what i was told. He paid an arm and a leg for them.
Thread Starter
Melting Slicks
Joined: Aug 2002
Posts: 2,737
Likes: 2
From: California USA
THe cheapest way to go is YT. They are very similar rockers, so not sure about those. Next up is Summit Racing RR, Comp Cams, Crane, Lunati, and Jessel. The Crane shaft mounts caught my attention, just not sure if I need to machine the heads for them. Just as well get a good set.
Tech Contributor
Joined: Apr 2007
Posts: 10,924
Likes: 78
From: Forney Texas
Buy 1 replacement Harlan Sharp so you can sell them as a set and then buy the Crane RR's I have them and drive my car like I stole it with no issues. They're alot beefier than the YT's. Lower weight is worthless if it can't hold up. The kit comes with 7.250 push rods. Check our parts for sale as well as LS1techs' for some good used ones. That's what I did. 
Team Owner
Joined: Mar 1999
Posts: 22,025
Likes: 192
From: At the beach in little Rhody
Crane shaft mounts require major machining of the head including milling of the rocker bosses and changing thread pitch of the rocker bolt holes. You would need to remove the heads for them. They also required either new valve covers or spacers to clear.
Thread Starter
Melting Slicks
Joined: Aug 2002
Posts: 2,737
Likes: 2
From: California USA
I'll let you guys know how I like the Yella Terras. Also have a backup Harlan Sharp coming in thanks to the warranty offered by HS.
Drifting
Joined: Jun 2006
Posts: 1,702
Likes: 1
All manufactures have failures in the field and I do mean all. Comp,HS,Crane and the Aussie stuff are all good RR,but they are not always perfect...sometimes defective parts do get out.