Re: Broken pushrod piece ,where does it end up?
[Re: shorthorse]
#2442620
01/29/18 01:16 AM
01/29/18 01:16 AM
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Joined: Jan 2003
Posts: 11,915 APACHE JUNCTION AZ
Joesixpack
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OP
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YES what you say makes sense, but this is a undecked block,unmilled heads,the intake fits fine unmodified, the intake bolts screw in by hand, its a stock 72 block ,the lifter angle has not been changed,i dont have a roller cam,nor roller rockers, the rockers are in the stock location, what does a TA intake rocker look like? the TA uses stock rockers on the exhaust,only the intake rocker is different. would a shorter pushrod change the angle from the rocker to the lifter of the pushrod? something does not make sense here.
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Re: Broken pushrod piece ,where does it end up?
[Re: shorthorse]
#2442683
01/29/18 02:40 AM
01/29/18 02:40 AM
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Joined: Jan 2003
Posts: 11,915 APACHE JUNCTION AZ
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have had same cam once engine was new and built in 2010 it aint a TA intake offset rocker, i looked and found a pic of those solid cam and lifters, rockers,pushrods and started out in this 360 yes pushrods were 3/8s tube size, i did not check clearance when i picked up complete engine from the builder, he should have checked during assembly. 7.500 was the length of the 3/8s pushrods proform 5/16s are 7.500 I determined pushrod length by solid cam,adjustable rockers,and listing for sm mopar. i did look at several brands which all seemed to have different lengths even for the solid cam set up. thanks for all your help.i figured with almost stock block,heads,rockers, etc that off the shelf parts would suffice. I have contacted Mike at B3R and explained the situation. hopefully he can assist me.
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Re: Broken pushrod piece ,where does it end up?
[Re: Joesixpack]
#2442821
01/29/18 12:40 PM
01/29/18 12:40 PM
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Joined: Jan 2006
Posts: 360 Ohio
shorthorse
enthusiast
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enthusiast
Joined: Jan 2006
Posts: 360
Ohio
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have had same cam once engine was new and built in 2010 it aint a TA intake offset rocker, i looked and found a pic of those solid cam and lifters, rockers,pushrods and started out in this 360 yes pushrods were 3/8s tube size, i did not check clearance when i picked up complete engine from the builder, he should have checked during assembly. 7.500 was the length of the 3/8s pushrods proform 5/16s are 7.500 I determined pushrod length by solid cam,adjustable rockers,and listing for sm mopar. i did look at several brands which all seemed to have different lengths even for the solid cam set up. thanks for all your help.i figured with almost stock block,heads,rockers, etc that off the shelf parts would suffice. I have contacted Mike at B3R and explained the situation. hopefully he can assist me. Good move. It will be helpful to know what the solution is. Keep us informed.
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Re: Broken pushrod piece ,where does it end up?
[Re: shorthorse]
#2442854
01/29/18 01:45 PM
01/29/18 01:45 PM
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Joined: Jan 2003
Posts: 11,915 APACHE JUNCTION AZ
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OP
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Hi William,
It's not so much a geometry problem that I can see, as it is a pushrod clearance issue. I run into this often, especially with small blocks, because there isn't enough room in the tunnel for oversize pushrods, or aftermarket parts with varied dimensions.
I'm not fond of the factory iron rockers, and their designed geometry, but if you want to use them, I suggest running a thick wall 5/16" pushrod with a 5/16" ball and cup dimension. A pushrod with the larger 3/8" ball and cup will not fit the lifter or the adjuster properly, and could cause problems with durability and fitment. I'm not sure what the wall thickness is on the ProComp pushrods, but it is likely the standard performance .080" wall, which may not be enough for your spring pressures. A call to Smith Brothers, Manton, or Trend would be a good idea.
Also, picking pushrod length by a catalog listing of factory pushrods is not a good idea in a performance motor. If everything is purely stock dimensions, that will work, but machining and aftermarket parts take away that option. They need to be measured for the proper length. That usually results in a custom length pushrod being needed, which one of the previously mentioned companies can provide.
You will want to thoroughly inspect the cam lobes and lifters for damage. With the pushrods rubbing that hard, there is a possibility the lifter was not able to spin properly and started wiping lobes on the cam. You mentioned the lash being loose, and that could be a sign of lobe wear on the cam.
If you still have clearance issues with the smaller pushrods, you will have to remove the heads and grind the tunnels larger, or you will have failures again in the future.
If you decide to upgrade to a roller rocker in the future, contact me first so I can help you avoid many of the pitfalls that Mopar guys experience when doing so. It is a worthwhile upgrade, but the right parts need to be used, and they have to be set up correctly. If you need anything, don't hesitate to ask. Good Luck!
Regards,
Michael Beachel B3 Racing Engines, LLC 717-497-6572
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