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#1
07-25-2005, 08:20 PM
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I had a broken spring,bent valve and now a lifter with a hole right through the bottom of it on my 74 455. It also rounded off the cam lobe where the bad lifter was also. I f any one has any info or similar problems like this any info would help. I have all new crane cam lifters, springs, and a cam on the way so any help to avoid a repeat would be nice.
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#2
07-25-2005, 08:32 PM
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I sure hope those crane springs are'nt their #99840-16 single springs.
If they are you may be in for a repeat of your current mess... Get some better springs,I recommend crower #68404-16 dual springs,they install at the stock height,require no machine work to fit,and are good to at least .550" lift,and are a much better spring compared to the crane single spring. I've had three of those crane single springs fail on my '72 GTO 455 H-O motor,luckily they were caught each time before any real damage occured,anyhow needless to say they were $#!*canned before they got a chance to fail again. And this was with the original 068 H-O cam and 1.5 rockers so they were nowhere near their max. lift figure. Use them at your own risk... |
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#3
07-25-2005, 09:12 PM
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Yes those are the new springs I have but I am ordering parts right now and I think I will get the crower springs. Thanks for the help. <BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by screamingchief:
I sure hope those crane springs are'nt their #99840-16 single springs. If they are you may be in for a repeat of your current mess... Get some better springs,I recommend crower #68404-16 dual springs,they install at the stock height,require no machine work to fit,and are good to at least .550" lift,and are a much better spring compared to the crane single spring. I've had three of those crane single springs fail on my '72 GTO 455 H-O motor,luckily they were caught each time before any real damage occured,anyhow needless to say they were $#!*canned before they got a chance to fail again. And this was with the original 068 H-O cam and 1.5 rockers so they were nowhere near their max. lift figure. Use them at your own risk... </div></BLOCKQUOTE> |
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#4
07-26-2005, 04:37 AM
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You don't say how much valve lift you have. It could be coil binding the springs causing the breakage. I would also check your guide-to-retainer clearance.
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#5
07-26-2005, 04:48 AM
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EXH guides can bind when not setup by a Pontiac head expert.
__________________
95 Towncar that needs more TQ. Sold 2023: 12.24/111.6MPH/1.76 60'/28"/3.54:1/SP-TH400/469 R96A/236-244-112LC/1050&TorkerI//3850Lbs//15MPG/89oct Sold 2003: 12.00/112MPH/1.61 60'/26"x3.31:1/10"/469 #48/245-255-110LSA/Q-Jet-Torker/3650Lbs//18MPG 94oct Sold 1994: 11.00/123MPH/1.50 60'/29.5"x4.10:1/10"/469 #48/245-255-110LSA/Dual600s-Wenzler/3250Lbs//94oct |
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#6
07-26-2005, 06:31 PM
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Why is that, HIS?
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#7
07-27-2005, 06:55 AM
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Head shops will tend to put positive stem seals on Pontiac Heads! You NEVER run stem seals on Iron heads. If you are running stock valves with 2 grooves, then you install O-ring seals on exhaust, Nothing else!
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Greg Merrick |
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