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Re: Think I may have messed up...Help!!!!!
[Re: Telvis]
#1593757
03/22/14 11:36 PM
03/22/14 11:36 PM
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Joined: Dec 2004
Posts: 10,553
Rittman Ohio
fourgearsavoy
I Live Here
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I Live Here
Joined: Dec 2004
Posts: 10,553
Rittman Ohio
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I would get the new valves and lap them in just to check the valve job and if they look good I would run them.I would also just use the stock stamped rockers unless your running some seriously stiff valve springs. Just my  Gus 
64 Plymouth Savoy
493 Indy EZ's by Nick at Compu-Flow
5-Speed Richmond faceplate Liberty box
Dana 60
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Re: Think I may have messed up...Help!!!!!
[Re: Cab_Burge]
#1593760
03/23/14 02:14 PM
03/23/14 02:14 PM
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Joined: Mar 2003
Posts: 1,728
ST clair shores MI
moretoys
top fuel
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top fuel
Joined: Mar 2003
Posts: 1,728
ST clair shores MI
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If you have the money, the performance you'll get from the aluminum heads is far better than the iron heads will give you. The aluminum will be less likely to produce spark knock,
My thoughts on the valve tip broken is it happened at the machine shop. probably didn't have the tool centered and it caught the end of the valve, they usually have pneumatic spring compressor, I have used 273 adj rockers on a hydraulic cam 340 with off the shelf standard length pushrods. There is some valve train noise,you just hear things moving,probably 15,000 miles on the build so far. it will be hard to get a quiet, factory like noise level. expect some noise.
I think a new set of valves,lap them in, good to go.
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Re: Think I may have messed up...Help!!!!!
[Re: Telvis]
#1593762
03/23/14 09:06 PM
03/23/14 09:06 PM
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Joined: Jan 2003
Posts: 15,355
Omaha Ne
TJP
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 15,355
Omaha Ne
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Quote:
Well..My gut was saying that I should replace all of them too. I can pick them all up at Summit for about $225. It will be worth the peace of mind. Is there a reason I should not replace the valves myself? I have done a couple many years ago. but never all of them and never on aluminum heads...Wouldn't think it would be that hard. Compress spring, remove locks and slide valve out...Reverse to install. Am I off base here?
valves need to be Fit to the guides and seats, IE: machined. Unless you want more problems than you've had so far 
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Re: Think I may have messed up...Help!!!!!
[Re: moretoys]
#1593763
03/23/14 09:22 PM
03/23/14 09:22 PM
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Joined: Jan 2003
Posts: 15,355
Omaha Ne
TJP
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 15,355
Omaha Ne
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Quote:
I have used 273 adj rockers on a hydraulic cam 340 with off the shelf standard length pushrods. There is some valve train noise,you just hear things moving,probably 15,000 miles on the build so far. it will be hard to get a quiet, factory like noise level. expect some noise.
your noise may be attributed to the known interference issues with 273 rockers 
Quote:
I run isky iron adjustable rockers on my small block street car. Been in service since 1988. Never an issue. Very similar to the 273 rockers.
The rockers are Similar but not the same
Just trying to make a point with the above quotes. The 273 rockers will work to a point, but they will wreak havoc at higher RPM due to the KNOWN valve spring/ retainer issues as well as being weak when subjected to too much spring pressure. CHEAP is not always good. IE: 273 rockers on a 340/360. YEAH bubba does it, and gets by but can't figure out why he gets SMOKED. It's because the valve train is HOSED UP (IE: interference that limits the motors ability to RPM) and starts flutterin a bit above 4k RPM.
OK,
To the OP, KUDO's to you for finding the root cause, I will say before I ran 273 rockers I would drop back to NEW stamped steel ones that most likely have the clearance needed.
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