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04-08-2003, 12:05 AM
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#1 |
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Recovering 67-72 Addict
 
Join Date: Oct 2000
Location: North Bend, WA
Posts: 1,788
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Cam woes
Some of you may remember but back in October I changed the cam in my 427. It had a Performer RPM which was just a little bit too much. I replaced it with a Crane Powermax H272. This cam worked great but recently (about 5000 miles) I had a lobe go flat on me. I have replaced about 6 cams over the last few years with no problems so I figured with the reputation that big blocks have for eating cams it was just the odds. Well, Summit exchanged the cam under warranty and even replaced the Felpro gasket kit with it. This weekend I installed the new cam (following Cranes install instructions to the letter) and I am completely at a loss. The truck runs OK while it is parked but when I drive it there is NO power and the valve train is very noisy. Tonight I pulled the covers to try readjusting the valves and discovered at least 4 pushrods not rotating. I can only assume that this cam is f'ed up now. Anyone else had problems with Crane Cams? Am I missing something here?
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68 Short Fleet 4x4; 427; BTO Level 3 700R4; NP205; Dana 60 front and rear; 4" lift with 35's; Disc brakes; AGR variable ratio steering; factory bucket seats; factory tach and tilt. "Friends call me cruzer cuz I like fast cars and fast women" |
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04-08-2003, 12:18 AM
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#2 |
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Used to have a truck
Join Date: May 2002
Location: port orchard WA
Posts: 1,552
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I had a crane crap out on me in a SS 454 El Camino when I was about 19 years old. I always figured it was my installation although I couldnt think of what I did wrong at the time. It was the last crane cam I ordered though. Ive had really good luck with Lunati and Compcams so I stick with those guys now.
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No truck :-( |
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04-08-2003, 12:22 AM
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#3 |
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Recovering 67-72 Addict
Join Date: Oct 2000
Location: North Bend, WA
Posts: 1,788
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This is the first (and last time) that I have used a Crane. Somebody told me once that they provide most of the cores to other grinders so I didn't think that there wouldn't be a quality issue. Live and learn...
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68 Short Fleet 4x4; 427; BTO Level 3 700R4; NP205; Dana 60 front and rear; 4" lift with 35's; Disc brakes; AGR variable ratio steering; factory bucket seats; factory tach and tilt. "Friends call me cruzer cuz I like fast cars and fast women" |
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04-08-2003, 01:02 AM
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#4 |
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Senior Member
Join Date: Dec 2001
Location: Redding,CA...USA
Posts: 4,736
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There is nothing wrong with crane cams..if the cause of cam failure is not improper breakin..then it is usually an alignmet or clearance problem..as in rocker bind..core shift..cam bearings installed incorrectly(especially on BBC) and the 427 is most common because of the different type of rear cam bearings..did you notice if both cams went out on the same lobes? when you preoiled(primed) did oil come out of each pushrod? did the lifters turn freely? push rods turn at first start up?
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It's called "drag racing" if they called it "tic..tic..WHAM!..BANG! F*&K!!!", they'd have to keep the magazines under the counter with the other men's publications click the clicky to join the site.... http://67-72chevytrucks.com/vboard/payments.php 67 lwb..first hotrod in 25 years..540 best ET is 9.45 @ 141.44 Anderson,CA |
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04-08-2003, 03:18 PM
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#5 |
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Registered User
Join Date: Dec 1999
Location: Austin, TX, USA
Posts: 7,720
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I agree with JIm that there is some other cause. I have run several Crane cams with zero failures and 100k mile performance.
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44 Willys MB 52 M38A1 64 Corvette Coupe 68 Camaro 'vert LT1 & TH700 69 Z/28 355 12.6's @110 69 Chevy Short Step 4 1/2"/7" drop 72 Jimmy 4WD 4spd 4" & 35's 02 GMC 2500HD 4x4 Duramax |
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