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Post by sc397 on Feb 9, 2018 6:56:35 GMT -8
Stock AMC Push Rod lengths: 7.767" - '66-'69 Single Pivot Rocker Arm 7.800" - '70 and later Single Pivot Rocker Arm 7.820" - '72 and later Brigde Rocker Arm.
I am building a late 360 with bridged rocker arms. The block was decked no more than .008" and the heads were milled but I don't know how much. The intake went on with no issues at all so probably no more than .010" Comp 268H Cam. Base circle measured slightly smaller than the stock. Customer provided new bridged rocker arms and push rods that measure at 7.794. According to my notes above, the new push rods should be on the short side. Something else is going on because when I install the new push rods with the new rocker arms, it looks like I am going to have about .080" pre-load on the lifters. That is too much so, I installed the 7.767" push rods and it looks like I have about .030"/.040" pre-load. So... As I type this, I am thinking that his great machinist who did the heads made the valve stem height too tall or, the stamped steel rocker arms are off which I doubt. Time for some measurements..
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Push Rods
Feb 9, 2018 7:44:25 GMT -8
via mobile
Post by spud on Feb 9, 2018 7:44:25 GMT -8
Might be the valvejob. Reground valves and seat always increase the stem height. That's why cheapie reworked heads always have random spring shims and maybe a touch up on the stem tip. I pretty much always have to re select pushrods or try and shim the rocker fulcrum or something when dealing with the bullshit non adjustable rocker
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Post by sc397 on Feb 9, 2018 8:15:42 GMT -8
All new valves but yea, I have to look at it every time as well. My Machinist gets it right every time. Imagine these guys that just throw it together and hope for the best.
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