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Jul 21st, 2025 | | | | Joined: Mar 2011 Posts: 65 'Bolter | | 'Bolter Joined: Mar 2011 Posts: 65 | Hi, Was working on my dads 1951 half ton truck. Truck runs really good (especially after new wires and correct R45 plugs). Pulled the valve cover because some time in the past it was put on with RTV and it looked bad. It was pretty gunked up, but not that bad. I cleaning it up when I noticed this pushrod. It is rubbing the side of the hole in the head and not centered on the valve stem. Everything else is good. Is there some sort of spacer I can put on the rocker shaft? http://i.imgur.com/prhJ1hc.jpgThis is me holding the rocker centered on the valve stem and centered in the hole: http://i.imgur.com/nGCozYe.jpgThanks for the help
Last edited by austinaubinoe; 08/26/2015 7:49 AM.
1951 1/2 Ton 216ci 4spd
1955 3/4 Ton NAPCO 235ci 4spd
1959 1/2 Ton stepside 235ci 4spd
| | | | | Joined: Sep 2013 Posts: 93 Shop Shark | | Shop Shark Joined: Sep 2013 Posts: 93 | Congrats Denny post number 10,000 !!!!!
1947 GMC Truck 5 window, Long Bed
2008 Corvette Roadster
2008 Harley Davidson FXDL
2011 F150 Ecoboost 4X4
2015 Subaru Outback AWD
"only the strong survive"
| | | | | Joined: Mar 2002 Posts: 9,112 'Bolter | | 'Bolter Joined: Mar 2002 Posts: 9,112 | I would say it is the wrong rocker or the wrong support. | | | | | Joined: Sep 2014 Posts: 385 Shop Shark | | Shop Shark Joined: Sep 2014 Posts: 385 | looking at the colour alone it looks to have been swapped out at some point. | | | | | Joined: Mar 2011 Posts: 65 'Bolter | | 'Bolter Joined: Mar 2011 Posts: 65 | Ok that makes sense, so the rockers are cast differently? The rod adjuster hold is basically cast to far over to one side for this rocker location.
Just searched and it seems all pre 1952 rockers are the same, and then there are 2 generations of 235 arms. Seems that the other rockers have a more symmetrical casting.
who can I contact for a single used arm to swap on? Seems to be only whole sets on ebay. Thanks!
1951 1/2 Ton 216ci 4spd
1955 3/4 Ton NAPCO 235ci 4spd
1959 1/2 Ton stepside 235ci 4spd
| | | | | Joined: Mar 2011 Posts: 65 'Bolter | | 'Bolter Joined: Mar 2011 Posts: 65 | GREAT!!!!! Appears to be intake valve for cylinder number 2? The diagram shows what appears to be the back half of the rocker assembly, but id assume its mirrored on the other side. Third rocker in from the front.
1951 1/2 Ton 216ci 4spd
1955 3/4 Ton NAPCO 235ci 4spd
1959 1/2 Ton stepside 235ci 4spd
| | | | | Joined: Sep 2014 Posts: 385 Shop Shark | | Shop Shark Joined: Sep 2014 Posts: 385 | The spring and washer are out of the picture to the left more next to the oil tube | | | | | Joined: Mar 2010 Posts: 10,059 Renaissance Man | | Renaissance Man Joined: Mar 2010 Posts: 10,059 | Hey Bruce, that count only means I spread lots of manure
around over the past decade, just ask Hotrod Jerry, I
believer he thinks that's all I'm capable of producing!
dg He just does that to boost his post count. 
1952 5-window - return to "as built" condition | 1950 3100 with a 235 and a T-5 transmission
| | | | | Joined: Feb 2004 Posts: 28,674 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 28,674 | Denny, even though cattle hauling is one form of trucking I never did, I recognize the talent of a fellow bull shipper! It's all good!
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!
| | | | | Joined: Mar 2011 Posts: 65 'Bolter | | 'Bolter Joined: Mar 2011 Posts: 65 | Hi thanks alot for the help. Did not realize the rocker assembly was in 2 pieces, and this will be a good time to clean the whole assembly. Pretty sure its an intake rocker: http://1954advance-design.com/Web%20images/1958-60-rocker-oil/1958-1.jpgThen according to this the number 2 cylinder intake valve requires a LH Rocker cast #5, part number 839563. I guess the search begins. Should I post a wanted ad looking for a #5 rocker for a 216 engine? Or should I just buy a complete rocker assembly? Thanks all! -Funny, when I search that part number it is giving me a 216 flywheel...
Last edited by austinaubinoe; 08/27/2015 8:32 AM.
1951 1/2 Ton 216ci 4spd
1955 3/4 Ton NAPCO 235ci 4spd
1959 1/2 Ton stepside 235ci 4spd
| | | | | Joined: Jul 2007 Posts: 444 Shop Shark | | Shop Shark Joined: Jul 2007 Posts: 444 | Denny Graham says, The correct rocker is in GP. 0.333, PN. 839464, cast 839465 RH Inlet number three cylinder. For 50-53 all w/216. Actually the casting # is 839466.Photo of GM # 839464 @ photobucket http://i669.photobucket.com/albums/vv57/glp0329/839464/Right_Inlet_GM__839464__zpsh1kqyh3g.jpgDan's Obsolete in Chinook, Montana phone: 406-357-2615 has ( 2 ) GM NOS Rocker Arms - GM part # 839464Chicago Auto Parts in Saint Anne, Ill. phone: 815 - 614 - 3122 has ( 1 ) GM NOS Rocker Arm - GM part # 839464
Last edited by '54 3600; 08/27/2015 10:29 AM. Reason: addition
| | | | | Joined: Mar 2011 Posts: 65 'Bolter | | 'Bolter Joined: Mar 2011 Posts: 65 | Denny Graham says, The correct rocker is in GP. 0.333, PN. 839464, cast 839465 RH Inlet number three cylinder. For 50-53 all w/216. Actually the casting # is 839466.Photo of GM # 839464 @ photobucket http://i669.photobucket.com/albums/vv57/glp0329/839464/Right_Inlet_GM__839464__zpsh1kqyh3g.jpgDan's Obsolete in Chinook, Montana phone: 406-357-2615 has ( 2 ) GM NOS Rocker Arms - GM part # 839464Chicago Auto Parts in Saint Anne, Ill. phone: 815 - 614 - 3122 has ( 1 ) GM NOS Rocker Arm - GM part # 839464 Wow this is great!! Would much rather just call up and order one (then wait around on a classified ad), but I didnt think that was possible. Just to be clear, I need the rocker arm for the #2 cylinder, third pushrod in from the front. Just want to be sure there was no confusion because you wrote 'number three cylinder'. Thanks
1951 1/2 Ton 216ci 4spd
1955 3/4 Ton NAPCO 235ci 4spd
1959 1/2 Ton stepside 235ci 4spd
| | | | | Joined: Oct 2006 Posts: 9,671 'Bolter | | 'Bolter Joined: Oct 2006 Posts: 9,671 | Opps, that's my mistake, had my focus on the center of
the assembly.
I'll edit my replies, no need to add any more confusion than
there is normally created in these threads. As to what's left
behind by the quodophiles, well, I can't correct that.
Sorry I miss read you picture, that's what happens when you
let a dyslexic into your discussion.
dg
Last edited by Denny Graham; 08/28/2015 1:14 PM.
Denny G
Sandwich, IL
| | | | | Joined: Mar 2011 Posts: 65 'Bolter | | 'Bolter Joined: Mar 2011 Posts: 65 | Opps, that's my mistake, had my focus on the center of
the assembly.
I'll edit my replies, no need to add any more confusion than
there is normally created in these threads. As to what's left
behind by the quodophiles, well, I can't correct that.
Sorry I miss read you picture, that's what happens when you
let a dyslexic into your discussion.
dg Thanks so much, I will call dans obsolete and ask for GM# 839464. I dont know enough about this stuff to figure this all out on my own, so I really appreciate it. Here is the pushrod cover I repainted gray, decided to leave the valve cover and filter cover the blue it was when we bought it 13 plus years ago. Added the thriftmaster sticker too! http://i.imgur.com/5ibXQLr.jpg
1951 1/2 Ton 216ci 4spd
1955 3/4 Ton NAPCO 235ci 4spd
1959 1/2 Ton stepside 235ci 4spd
| | | | | Joined: Oct 2006 Posts: 9,671 'Bolter | | 'Bolter Joined: Oct 2006 Posts: 9,671 | Exactly as I posted...the reason I've bailed on this thread is
it's gotten entirely to confusing.
If it's the intake of No.2 than it's a Left hand intake rocker.
Look in the shop manual and parts book. A Left hand intake
rocker for a 50-53 216 is pn. 839463 and should have a
839465 casting number.
dg
Last edited by Denny Graham; 08/29/2015 10:35 AM.
Denny G
Sandwich, IL
| | | | | Joined: Jul 2007 Posts: 444 Shop Shark | | Shop Shark Joined: Jul 2007 Posts: 444 | The Left - Intake Rocker Arm is GM # 0.333 - GM # 839463 with a casting # of: 839465 Last # in the casting # is the " LARGE 5 " photo @ photobucket http://i669.photobucket.com/albums/..._Intake_Casting__839465__zpsabfom9f7.jpgDan's Obsolete in Chinook, Montana has ( 7 ) - GM # 839463 phone: 406-357-2615
Last edited by '54 3600; 08/29/2015 9:10 AM. Reason: addition
| | | | | Joined: Oct 2006 Posts: 9,671 'Bolter | | 'Bolter Joined: Oct 2006 Posts: 9,671 | I changed that last number George, thanks, the wife's been after
me to get new glasses, think I'd better take her advice or
start wearing my OptiVisor at the confuser.
dg
Denny G
Sandwich, IL
| | | | | Joined: Mar 2011 Posts: 65 'Bolter | | 'Bolter Joined: Mar 2011 Posts: 65 | THANK YOU yes this thread did get confusing! Appreciate the effort, cant wait to get the 51 back on the road!
1951 1/2 Ton 216ci 4spd
1955 3/4 Ton NAPCO 235ci 4spd
1959 1/2 Ton stepside 235ci 4spd
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