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Re: Think I may have messed up...Help!!!!!
[Re: Telvis]
#1593737
03/22/14 03:22 PM
03/22/14 03:22 PM
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Joined: Jan 2003
Posts: 15,304
Omaha Ne
TJP
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 15,304
Omaha Ne
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Quote:
I have been reading everything I can on the 340 valve train and just read that the 340 rockers were different than the 318 rockers. Apparently they have a relief area for bigger valve springs. I didn't realize they were different. I used a set of 318 rockers! Haven't been able to go out and confirm this is my problem but can anyone confirm if this is truly the case? Were the rockers different? Could this be the cause of my noise?
When the 340's came out in 68 they used 318 rockers with larger diameter springs and retainers. They DEFINITELY had interference issues. The problem was corrected sometime early to mid 69. They corrected it by grinding a relief on the backside of the rocker during manufacturing. I believe all the rockers from that point forward
(318/340/360) all had the relief in them. If one is using a set of early rockers it would be best to swap them out or at least check them. This issue can also be present when using 273 rockers.
Congrats on finding the issue, that could have been disastrous. As to the cause I'm going to bet on a manufacturing defect 
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Re: Think I may have messed up...Help!!!!!
[Re: TJP]
#1593738
03/22/14 03:33 PM
03/22/14 03:33 PM
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Joined: Sep 2013
Posts: 464
KY
Telvis
OP
mopar
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OP
mopar
Joined: Sep 2013
Posts: 464
KY
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The more I read the more I think my stock rockers will work fine. I think the valve tip was the issue from the start. I had the same noise from the very first start up. I have checked all the other valve tips and they seem good. I did go back and read the Edelbrock instructions and they say the stock pushrod is 7.35... I thought stock pushrods are 7.5? This could definitely have cause excessive preload if they are supposed to be the 7.35. Might have contributed to the tip popping off if it was already ready to go? I am going to get another valve and see what happens. Anyone know what brand of valves they put in the Eddies? I want to make sure the new valve fits properly.
That's King Weenie to you!
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Re: Think I may have messed up...Help!!!!!
[Re: Telvis]
#1593741
03/22/14 04:18 PM
03/22/14 04:18 PM
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Joined: Sep 2013
Posts: 464
KY
Telvis
OP
mopar
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OP
mopar
Joined: Sep 2013
Posts: 464
KY
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Here's the instruction sheet with the pushrod specifications. I think I may have mis-read it. They specify an adjustable rocker arm must be used with the pushrod length of 7.375. I have found two different instruction sheets for these heads. One says the stiock rockers are OK and the other says the adjustable must be used. I'm going to go adjustable to eliminate any future problems. Fix it all now and hopefully I will be good. I have never dealt with anything other than the stock stamped rockers. Im a bit iffy on what rockers and lifter combination to use. I know I will determine push rod length after the rockers are installed. I know the 273's are inexpensive but what lifter to use with them? One person says Hydraulic are good and someone else says they aren't. I don't want to spend money on something I don't really need. Rockers, lifters and pushrods are expensive. I wan't to do it right the first time...Unlike my current situation... 
Last edited by Telvis; 03/22/14 04:28 PM.
That's King Weenie to you!
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Re: Think I may have messed up...Help!!!!!
[Re: MoparforLife]
#1593743
03/22/14 05:47 PM
03/22/14 05:47 PM
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Joined: Sep 2013
Posts: 464
KY
Telvis
OP
mopar
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OP
mopar
Joined: Sep 2013
Posts: 464
KY
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So, what length pushrods with the 273 rockers? 7.2xx...I can't remember the rest of the numbers but are those the ones I need? Should I just wait and order custom pushrods after I get the rockers? Stick with the stock Hydraulic lifters?
Last edited by Telvis; 03/22/14 05:49 PM.
That's King Weenie to you!
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Re: Think I may have messed up...Help!!!!!
[Re: Telvis]
#1593745
03/22/14 06:31 PM
03/22/14 06:31 PM
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Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
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I found this in my notes from way back if I wrote it down correct. hyd ball/ball-7.51" (stock 318/360 I'm assuming). adj hyd cup/ball (TA?)-7.23". solid ball/cup (273 I'm assuming) 7.340". Assuming your preload is acceptable from what I gather it is then there is only a problem with the one lifter (or pushrod) & not likely that that one pushrod is way shorter than the rest of em so I'd pull that lifter & open it up and eyeball that lobe to find where all that clearance is coming from then go from there. If ordering correct length pushrods you'd install a pair of rockers & use an adjustable checking pushrod to find the exact length needed to be ordered but I think the problem is confined to that one lifter/pushrod/lobe & that new rockers ain't needed. iirc this is a mild hyd cam
live every 24 hour block of time like it's your last day on earth
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Re: Think I may have messed up...Help!!!!!
[Re: RapidRobert]
#1593746
03/22/14 06:34 PM
03/22/14 06:34 PM
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Joined: Sep 2013
Posts: 464
KY
Telvis
OP
mopar
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OP
mopar
Joined: Sep 2013
Posts: 464
KY
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I found the issue. It was a broken valve tip...Not sure what caused it...I'm now trying to determine what I want to do from this point forward. Will replace the valve but now trying to determine what I want to do for rockers.
Last edited by Telvis; 03/22/14 06:35 PM.
That's King Weenie to you!
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Re: Think I may have messed up...Help!!!!!
[Re: Telvis]
#1593747
03/22/14 06:35 PM
03/22/14 06:35 PM
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Joined: Jan 2003
Posts: 74,974
U.S.S.A.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 74,974
U.S.S.A.
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Quote:
Quote:
i would try shaft shims before new push rods.. IMO too long will not cause noise...
That makes sense. What do you use for shims? Is this something made specifically for this purpose? I'm imagining a washer.
WRONG , Shims are for correcting rocker to valve geometry NOT for correcting for pushrods that are too long .
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Re: Think I may have messed up...Help!!!!!
[Re: Telvis]
#1593750
03/22/14 08:36 PM
03/22/14 08:36 PM
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Joined: Oct 2006
Posts: 596
Mass.
80fbody
mopar
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mopar
Joined: Oct 2006
Posts: 596
Mass.
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Your gut has been right so far. Stick with it. Personally, there's no way I'd just fix one valve & call it good. Either have a complete new set of valves, locks & retainers installed or run your iron heads. Losing the tip of the valve is not common. Either really poor hardening, chinese valves, wrong locks, etc. 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.
Also, while your swapping the heads, you'll be able to inspect all cam lobes & check each lifter. Make sure to lube all the lobes again (don't mix up the lifters).
Last edited by 80fbody; 03/22/14 08:37 PM.
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Re: Think I may have messed up...Help!!!!!
[Re: fourgearsavoy]
#1593752
03/22/14 10:07 PM
03/22/14 10:07 PM
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Joined: Sep 2013
Posts: 464
KY
Telvis
OP
mopar
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OP
mopar
Joined: Sep 2013
Posts: 464
KY
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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?
That's King Weenie to you!
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Re: Think I may have messed up...Help!!!!!
[Re: Telvis]
#1593753
03/22/14 10:08 PM
03/22/14 10:08 PM
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Joined: Jan 2003
Posts: 74,974
U.S.S.A.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 74,974
U.S.S.A.
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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?
You need to check stem to guide clearance , do you have the tools to do that ?
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Re: Think I may have messed up...Help!!!!!
[Re: Telvis]
#1593756
03/22/14 10:37 PM
03/22/14 10:37 PM
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Joined: Sep 2013
Posts: 464
KY
Telvis
OP
mopar
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OP
mopar
Joined: Sep 2013
Posts: 464
KY
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Are the aluminum heads really worth the effort? Considering the cam I have and the set of J smog heads I have, would I be better off using the iron heads? Am I really going to see that much difference in performance to justify spending at least another $1000 for new valves, adjustable rockers and pushrods? The more I think about it I am inclined to cut my losses with the aluminum heads and use the J heads. What would you do?
That's King Weenie to you!
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I would replace all the valves just for your own piece of mind 
