Rocker Adjustment

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DesertRat said:
I have a post here about this. I used a Lunati hydraulic setup on my 67 LA commando build with stock adjustable rockers. Had smith brothers custom pushrods built to get the geometry correct. I don’t think there is a one length fits all answer for this conversion. However the adjustment for this setup is zero lash + 1/2 turn.
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I just can't get over this thing where Chrysler somehow made all their LA engines each with its own custom length pushrods.
 
Lee Prim said:
I just can't get over this thing where Chrysler somehow made all their LA engines each with its own custom length pushrods.
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They didn't. But the **** is pushing 50 years old, has been machined on, and parts have been updated and probably made incorrectly.

I gave you the length you need. It was easy to find.
 
DesertRat said:
I have a post here about this. I used a Lunati hydraulic setup on my 67 LA commando build with stock adjustable rockers. Had smith brothers custom pushrods built to get the geometry correct. I don’t think there is a one length fits all answer for this conversion. However the adjustment for this setup is zero lash + 1/2 turn.
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Pushrod length for shaft rockers only affects geometry as the change in adjuster angle changes the rocker ratio.

Otherwise, all pushrod length does is make the adjuster stick out more or less.
 
In my case I used 340 TA pushrods on a members advice. I ran the car about 2K miles but couldn’t get rid of the noise. The pushrods were too long and with the balls backed out to adjustment the rockers hit the cup of the pushrods. The pushrods were also hitting the heads where they went through causing noise. Thats just my experience and custom rod length fixed the problem.
 
DesertRat said:
In my case I used 340 TA pushrods on a members advice. I ran the car about 2K miles but couldn’t get rid of the noise. The pushrods were too long and with the balls backed out to adjustment the rockers hit the cup of the pushrods. The pushrods were also hitting the heads where they went through causing noise. Thats just my experience and custom rod length fixed the problem.
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The heads are off. There's no signs or stamps to suggest that the heads or block have ever been milled. Going to start with the TA pushrods and hope for the best. If that doesn't work at least I know where to go from there.
 
It’s not widely done. We’re considered sissies if we change a solid lifter motor to hydraulic lifters regardless of the cam grind.
 
Lee Prim said:
COOL !! Thanks !! I take it that the adjustables are oiled through the rocker shafts therefore can use solid pushrods. Please feel free to copy and paste your response to the MULTIPLE threads on this where people have WAY overthunk this modification.
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Lee Prim said:
The heads are off. There's no signs or stamps to suggest that the heads or block have ever been milled. Going to start with the TA pushrods and hope for the best. If that doesn't work at least I know where to go from there.
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I think that's a good plan.
 
Lee Prim said:
Could be. I asked the folks at Comp Cams Tech and they were clueless. As if they had never heard of this combination.
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822-16 lifter has a 1.88” Seat Height You can measure one of your solid lifters and do the math.
I would run the Howard's cam EDM solid lifter. I quit using hyd lifters a while back even on mild street cams. A tight lash solid cam is quiet.
 
I recommend Magnum lifters for shaft rocker engines if you have to buy both lifters and pushrods start with oiled lifters
in addition to what was said above too long an adjustment and things break see also the too long pushrod comment
also agree on keeping a solid lifter cam
 
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