Re: 340 .035 Valve Lash What's The Deal
[Re: ringo440]
#2190842
11/06/16 06:33 PM
11/06/16 06:33 PM
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Supercuda
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Obviously the pushrods are not the correct length for your combo.
Did someone put in an extra fat headgaskets to lower compression?..Since just about everyone lists the same part number for AMC or Mopar lifters I doubt that's it.
They say there are no such thing as a stupid question. They say there is always the exception that proves the rule. Don't be the exception.
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Re: 340 .035 Valve Lash What's The Deal
[Re: ringo440]
#2190876
11/06/16 07:37 PM
11/06/16 07:37 PM
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Joined: Nov 2003
Posts: 36,040 Lincoln Nebraska
RapidRobert
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Lincoln Nebraska
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OE non adjustable rockers? you have that much lash at the rocker on base circle and the lifter cup is up against the retainer clip? Yes you would need longer pushrods to elim that .035 lash at the rocker & additionally to move the cup below the snap ring (for some preload) and iron adjustable rockers MAY be a solution. EDIT what length of pushrods do you have? MORE EDIT hyd-7.510". hyd with adj rockers-7.23". 273 solid lifter pushrods-7.340"
Last edited by RapidRobert; 11/06/16 11:07 PM. Reason: more info
live every 24 hour block of time like it's your last day on earth
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Re: 340 .035 Valve Lash What's The Deal
[Re: Cab_Burge]
#2191072
11/06/16 11:43 PM
11/06/16 11:43 PM
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Posts: 36,040 Lincoln Nebraska
RapidRobert
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What Cab said, it cant be run like this (if we are reading this right: (Hyd lifters with no preload & .035" clearance at the rocker)
live every 24 hour block of time like it's your last day on earth
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Re: 340 .035 Valve Lash What's The Deal
[Re: ringo440]
#2191430
11/07/16 02:06 PM
11/07/16 02:06 PM
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Joined: Nov 2005
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ringo440
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Thanks for all the information I like it when all the options are in a positive manner and all are helpful. At this time the route that I going with is some old 273 adjustable rockers with the correct length hyd pushrods. I had heard about cams being made on smaller base circle but was not sure that the purple shafts were manufactured that way. This engine was built twenty four years ago and never run because when they started it up they didn't have much oil pressure. Then the owner suddenly passed away. SO it set in the garage for twenty four until I bought it. Found the oil gallery plug was missing and replaced it. (Don't ask how I knew to look for that ). Engine runs great other than Alot valve ticking. Thanks again.
Last edited by ringo440; 11/07/16 02:09 PM.
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Re: 340 .035 Valve Lash What's The Deal
[Re: ringo440]
#2191445
11/07/16 02:21 PM
11/07/16 02:21 PM
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Posts: 36,040 Lincoln Nebraska
RapidRobert
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Thanks for all the information I like it when all the options are in a positive manner and all are helpful. Enjoy it while it lasts. (We ain't like this all the time)
live every 24 hour block of time like it's your last day on earth
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Re: 340 .035 Valve Lash What's The Deal
[Re: ruderunner]
#2191462
11/07/16 02:33 PM
11/07/16 02:33 PM
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JohnRR
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AMC lifters would use shorter pushrods , his are not long enough.
running up my post count some more .
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Re: 340 .035 Valve Lash What's The Deal
[Re: ringo440]
#2191467
11/07/16 02:37 PM
11/07/16 02:37 PM
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Posts: 75,004 U.S.S.A.
JohnRR
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I have about .035 valve lash on most of my rockers no preload . Stock rockers the with a flat tapped hydraulic purple shaft cam . No idea which one,Engine already built when I purchased the car. The valves had a ticking noise oil pressure is 45 psi at idle. Checked rockers and notice they were loose. Could it have wrong lifters. I pulled a few bottom looks fine. Check pushrods they are correct length. Anyone every had the problem. Was it doing this when you bought it ? The pushrods are not the correct length if you have that much lash.
running up my post count some more .
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Re: 340 .035 Valve Lash What's The Deal
[Re: JohnRR]
#2191537
11/07/16 03:43 PM
11/07/16 03:43 PM
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Joined: Nov 2005
Posts: 235 ga
ringo440
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Pushrods measure 7.530 . you are right they are not the right length, but are correct for a stock 340. There is probably enough wear on the old factory rocker combined with a smaller base circle on the cam to get to that lash. Yes it has been this way from the first time I started the engine.
Last edited by ringo440; 11/07/16 03:50 PM.
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Re: 340 .035 Valve Lash What's The Deal
[Re: ringo440]
#2191574
11/07/16 04:25 PM
11/07/16 04:25 PM
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JohnRR
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Pushrods measure 7.530 . you are right they are not the right length, but are correct for a stock 340. There is probably enough wear on the old factory rocker combined with a smaller base circle on the cam to get to that lash. Yes it has been this way from the first time I started the engine. Sounds like it's not a STOCK 340 so that number goes out the window ... as you can see. Get a checking pushrod , figure out the length needed , do a few on both banks , and by an ADJUSTABLE length pushrod from Smith Brothers and call it done . Adjust each pushrod to get the amount of preload you want on every lifter.
running up my post count some more .
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Re: 340 .035 Valve Lash What's The Deal
[Re: ringo440]
#2191723
11/07/16 08:12 PM
11/07/16 08:12 PM
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Posts: 75,004 U.S.S.A.
JohnRR
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What's wrong with going with a set of 273 adjustable rockers ? Nothing, if you have a set .
running up my post count some more .
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Re: 340 .035 Valve Lash What's The Deal
[Re: ringo440]
#2191726
11/07/16 08:24 PM
11/07/16 08:24 PM
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Joined: Aug 2003
Posts: 43,157 Bend,OR USA
Cab_Burge
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Thanks for all the information I like it when all the options are in a positive manner and all are helpful. At this time the route that I going with is some old 273 adjustable rockers with the correct length hyd pushrods. I had heard about cams being made on smaller base circle but was not sure that the purple shafts were manufactured that way. This engine was built twenty four years ago and never run because when they started it up they didn't have much oil pressure. Then the owner suddenly passed away. SO it set in the garage for twenty four until I bought it. Found the oil gallery plug was missing and replaced it. (Don't ask how I knew to look for that ). Engine runs great other than A lot valve ticking. Thanks again. Twenty years ago most parts houses and cam grinders stocked the early, pre 1967, and later hydraulic lifters. The early ones, both hydraulics and solid lifters have 1/4 ball cups in them. The 1967 and later Mopar hydraulic lifters use a 5/16 ball size so maybe your motor has mismatch components. They do not have the same height for the pushrod cups in relation to the cam lobes Mopar, in all of it's infinite wisdom, introduced the LA 318 with hydraulic lifters and stamp steel non adjustable rocker arms in all cars made in the Los Angles plant in 1966, all the other 1966 Cars with 318 motors had the Poly 318 motors with solid lifters All Mopar V8 shared the same lifters back then, hydraulic or solids, same thing on the 1967 and later Mopar V8 lifters
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: 340 .035 Valve Lash What's The Deal
[Re: JohnRR]
#2191750
11/07/16 08:52 PM
11/07/16 08:52 PM
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Joined: Nov 2005
Posts: 235 ga
ringo440
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What's wrong with going with a set of 273 adjustable rockers ? Nothing, if you have a set . I just so happen to have a set and just ordered 7.23 5/16 ball & cup pushrods from summit
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