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I may have messed up...Help!.. IT'S ALIVE!!!!!
#1593657
03/16/14 11:44 AM
03/16/14 11:44 AM
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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 started my freshly built 340 last night. Immediately upon startup I had quite a bit of valve train noise. I let it run for about five minutes before shutting it down in fear of doing serious damage. Might have already, I don't know. The lower end sounds fine. Just a lot of rocker noise. I confirmed it by removing the oil filler cap and could hear it. Oil pressure is good and I followed cam break in procedures. I think my mistake was using stock rockers, at least i'm hoping that's what it is. I have a 69 340 block with Speedpro forged pistons .30 over. I installed a Lunati Voodoo #10200702 cam and comp cams hydraulic lifters. I had scored a deal a like new set of Edelbrock Performer aluminum heads 6017 for the 340 and had them checked before install. Please tell me I haven't ruined the motor. If it's just the rockers can I use a set of 273 adjustable rockers and pushrods without swapping anything else out? I should have stayed away from the Eddie heads. I have always used stock heads but the aluminum heads were a good deal at $800 for the set.
Last edited by Telvis; 03/29/14 05:00 PM.
That's King Weenie to you!
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Re: Think I may have messed up...Help!!!!!
[Re: Telvis]
#1593659
03/16/14 11:47 AM
03/16/14 11:47 AM
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Joined: Aug 2003
Posts: 12,291
Kent, Wa
340SHORTY
Truck Nut
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Truck Nut
Joined: Aug 2003
Posts: 12,291
Kent, Wa
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yes you can use the 273 rocker arms and pushrods. Unlikely you did any damage.
I am truckless..
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Re: Think I may have messed up...Help!!!!!
[Re: mcat4321]
#1593660
03/16/14 11:51 AM
03/16/14 11:51 AM
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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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Rotella plus a bottle of break-in additive.
That's King Weenie to you!
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Re: Think I may have messed up...Help!!!!!
[Re: Telvis]
#1593661
03/16/14 11:51 AM
03/16/14 11:51 AM
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Joined: Apr 2010
Posts: 4,154
bethlehem pa
mikemee1331
master
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master
Joined: Apr 2010
Posts: 4,154
bethlehem pa
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Quote:
I started my freshly built 340 last night. Immediately upon startup I had quite a bit of valve train noise. I let it run for about five minutes before shutting it down in fear of doing serious damage. Might have already, I don't know. The lower end sounds fine. Just a lot of rocker noise. I confirmed it by removing the oil filler cap and could hear it. Oil pressure is good and I followed cam break in procedures. I think my mistake was using stock rockers, at least i'm hoping that's what it is. I have a 69 340 block with Speedpro forged pistons .30 over. I installed a Lunati Voodoo #60402 cam and comp cams hydraulic lifters. I had scored a deal a like new set of Edelbrock Performer aluminum heads 6017 for the 340 and had them checked before install. Please tell me I haven't ruined the motor. If it's just the rockers can I use a set of 273 adjustable rockers and pushrods without swapping anything else out? I should have stayed away from the Eddie heads. I have always used stock heads but the aluminum heads were a good deal at $800 for the set.
i'm going to let someone who is fimiliar with these heads confirm this but i think your valve train geometry may be off. i don't think you've actually hurt anything but i would check into that. check 'wiggle' at the pushrod.
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Re: Think I may have messed up...Help!!!!!
[Re: Telvis]
#1593662
03/16/14 11:58 AM
03/16/14 11:58 AM
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Joined: Aug 2003
Posts: 3,101
cincinnati ohio
mcat4321
master
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master
Joined: Aug 2003
Posts: 3,101
cincinnati ohio
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Quote:
Rotella plus a bottle of break-in additive.
the very next thing i would do, if you have a oil filter cutting tool, check the filter for metal..
if you do not have a cutting tool.. drain the oil through a paint strainer or a coffee filter. tip the filter and drain it too . look for metal. a small amount is expected. if you have lots of metal. there is no need to go any further.. the motor is hurt. if you have no metal keep searching  good luck 
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Re: Think I may have messed up...Help!!!!!
[Re: Telvis]
#1593668
03/16/14 01:03 PM
03/16/14 01:03 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 just went and drained the oil. I filtered it through a coffee filter and ran a magnet through it. I didn't see any metal at all. I think my cam is still alive. I pulled one of the valve covers and the pushrods all had a bit of tension on them. They weren't loose at all. I did notice that three of the four sets of rockers had play from side to side on the shaft. One set (third from the front) were tight together. The other three sets had maybe a 16th of an inch side to side play between them. I checked and they are oriented correctly. The correct spacers are on the bolts. I did buy these off ebay because I didn't want to remove the set I had on the existing 318. Could it be the rockers are a "frankenstein" mismatched set? Just looking at the cam specs I don't see why the stock rockers won't work. I'm by no means an expert but I have head the stock stuff is fairly stout. Am I misinformed?
Here's the cam info:
Lift at valve .475 in. .494 ex
Rocker ratio: 1.500 in in. 1.500 ex
Duration at .050 Tappet lift: 220 in. 226 ex.
Duration: 265 in. 271 ex.
That's King Weenie to you!
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Re: Think I may have messed up...Help!!!!!
[Re: Supercuda]
#1593670
03/16/14 01:16 PM
03/16/14 01:16 PM
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Joined: Aug 2003
Posts: 3,101
cincinnati ohio
mcat4321
master
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master
Joined: Aug 2003
Posts: 3,101
cincinnati ohio
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Quote:
Quote:
yes you can use the 273 rocker arms and pushrods. Unlikely you did any damage.
You cannot use stock 273 adjustable rocker pushrods with a hydraulic lifter cam.
i disagree, i have done it.. i know others who have done it. and for years on end
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Re: Think I may have messed up...Help!!!!!
[Re: mcat4321]
#1593673
03/16/14 01:23 PM
03/16/14 01:23 PM
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Joined: Jul 2007
Posts: 11,836
Florida
mopar346
Let me tell ya about fat chicks!
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Let me tell ya about fat chicks!
Joined: Jul 2007
Posts: 11,836
Florida
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 Reference using 273 rockers with a hydraulic cam. You just have to adjust them correctly. The T/A engine used adjsutables with hydraulic cams.
Careful, your character's showing!
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Re: Think I may have messed up...Help!!!!!
[Re: Telvis]
#1593674
03/16/14 01:23 PM
03/16/14 01:23 PM
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Joined: Jan 2003
Posts: 1,255
Columbus, GA
Michael Ecks
pro stock
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pro stock
Joined: Jan 2003
Posts: 1,255
Columbus, GA
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What kind of pistons did you use? Did you measure piston to valve clearances to make sure you are having contact there?
If the edelbrock heads are the magnum replacement part number you may have pushrods binding in the tunnels as the roller cam A engines have different pushrod geometry due to the taller lifter.
Did you fill the lifters before installing them? I've done it both ways and seen it recommend both ways. Rhoads and some others recommend submerging the lifters in oil and working the plunger in the bore with a pushrod until bubbles stop coming out. I've seen others recommend installing them dry for less initial pressure on the cam lobes. They take longer than you might expect to pump up from bone dry and sound like hell until they do.
good luck, let us know how it turns out.
"The happiness of your life depends upon the quality of
your thoughts" ~ Roman Emperor Marcus Aurelius
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Re: Think I may have messed up...Help!!!!!
[Re: Telvis]
#1593675
03/16/14 01:25 PM
03/16/14 01:25 PM
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Joined: Oct 2005
Posts: 8,853
Ontario, Canada
Stanton
Don't question me!
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Don't question me!
Joined: Oct 2005
Posts: 8,853
Ontario, Canada
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Quote:
How do I figure out what length pushrod I need? is there a measurement procedure?
Yes. It usually involves buying an adjustable pushrod made for that purpose (buying two makes it easier). Most cam manufacturers sell them. They come in various lengths and end configurations.
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