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Shimming the rocker shaft
https://www.slantsix.org/forum/viewtopic.php?t=60891		 Page 1 of 2
Author:  mikewilliams [ Wed Mar 15, 2017 9:34 am ]
Post subject:  Shimming the rocker shaft
Hi Guys
I though i would pass this on, about my rocker shaft.
I bought some over size valve's off of e-bay and had them installed on the head. I DID NOT CHECK the stem height.
So now I'm doing my valve train geometry and had to lift my rocker shaft 5/16" off of the saddle, I will mill the saddle tops off on the milling machine and make up aluminum block's like ( Will ) did in is pictures.
Boy..5/16" is a lot, but you have to make it work ?
Thanks
Mike
Author:  Reed [ Wed Mar 15, 2017 10:33 am ]
Post subject: 
Why not remove the valves and shorten the stems and recut the keeper grooves?
Author:  sandy in BC [ Wed Mar 15, 2017 10:49 am ]
Post subject: 
Get the right valves.
Author:  Reed [ Wed Mar 15, 2017 11:19 am ]
Post subject: 
Quote:
Get the right valves.
Yeah, or that. That would be the cheapest and easiest solution.
Author:  mikewilliams [ Wed Mar 15, 2017 11:58 am ]
Post subject: 
For me, lifting the shaft is the easy way, I don't have to spend any money.
Author:  ProCycle [ Wed Mar 15, 2017 12:24 pm ]
Post subject: 
Hmm... 5/16" seems like a really long way.
Won't you need longer push rods?
And what about valve spring height?
Author:  CNC-Dude [ Wed Mar 15, 2017 2:18 pm ]
Post subject: 
Moving the rocker shaft centerline upward makes the valve centerlines move farther away from the rocker arm tips. You might want to re-think this before you ruin your head.
Author:  Rick Covalt [ Wed Mar 15, 2017 2:41 pm ]
Post subject: 
How much of the valve stem is sticking above the retainer? Could you tim 1/8" off? Then you might could make it work.
Author:  SlantSixDan [ Wed Mar 15, 2017 7:03 pm ]
Post subject: 
Quote:
For me, lifting the shaft is the easy way, I don't have to spend any money.
In my experience, doing it (whatever "it" is) the right way almost always costs less money, effort, time, aggravation, blood, sweat, and tears.
Author:  Dave M [ Wed Mar 15, 2017 8:08 pm ]
Post subject: 
How much longer are new valves compared to the old valves ? I have made the aluminum stands before like you are talking about but they were only .200 taller.
Author:  mikewilliams [ Thu Mar 16, 2017 2:38 am ]
Post subject: 
I will look into getting the right valves and spring's
Thank's guy's
Mike
Author:  Charrlie_S [ Thu Mar 16, 2017 4:04 am ]
Post subject: 
I did this on a 440 engine that I installed 1.6 ratio shaft mount chevy roller rockers, and it worked fine ( running 10.8's for about 10 seasons). I have a slant six head in process, doing the same thing. I used the rocker stands for a Mopar 413 engine (they had bolt on stands, and the same rocker shaft diameter). By raising the shaft, I can run longer valves, and keep a longer guide (better support, longer life), with a high lift cam. Yes it does require different springs, and pushrods (I made my own, by shortening longer tubular ones).
Author:  mikewilliams [ Thu Mar 16, 2017 6:10 am ]
Post subject: 
OK..here's what is going on, This morning I took two other heads that I have and took the valves out to check and compare with the stainless ones, the only difference was the head size.
I feel like a dog chasing its tail.
Ok..my stem height is same as stock, so why do I need to shim my rocker shaft so much to get my valve train geometer right ??
what else could, rocker size ??
Help
Mike
Author:  Reed [ Thu Mar 16, 2017 7:29 am ]
Post subject: 
Severely recessed valve seats? Some pictures would help here. Are you using the adjustable rocker arms that came on mechanical cam engines?
Author:  mikewilliams [ Thu Mar 16, 2017 8:12 am ]
Post subject: 
Yes..I'm using adjustable rockers, the stock ones.
I got a guy coming over tonight to set it up and he has a push rod tool, he says he's done lot's.
Thanks guy's
Mike
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