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Old 08-21-2008, 04:48 PM
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Installing lt4 hot cam kit

I am going to install the lt4 hot cam kit on my zz4 this weekend
This will be my first roller cam installation
Any of you guys that have installed the lt4 hot cam kit is there anything I should think about when I an installing this kit
Also one of the lifters has been ticking since I bought the engine
I adjusted the valves the ticking would not go away
So I bought some new GM roller lifters are these lifters pretty straight forward to install
Any problems changing the springs
When you adjusted the valves once the push rod stopped spinning how much more did you turn the lock nut
Thanks

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Old 08-21-2008, 07:57 PM
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You want to measure the space beween the retainer bottom and seal on the guide. For a Hot cam with 1.6 rockers (.525" lift) you need .585" between the retainer bottom and valve seal top. (.525" +.060" clearance at full valve lift)
Make sure the seal is fully seated on the guide top.

If when adusting the rockers, the push rod stops spinning, you have likely gone way too far.
Adjust the rocker nut while spinning the pushrod and moving it up and down with your fingers. When the clearance in the valve train is just eliminated (the pushrod probabily will still spin),,, you are at "0 lash". From this point, tighten the rocker nut 1/2 turn tighter. If you do it right, with the lifter down and on the heel of the cam lobe, no further adjustment is nessessary.
The internal plunger in the lifter body will be .030" below the lifter plunger snap ring, when adjusted properly.
If you keep cranking down the rocker nut until the pushrod won;t spin, the internal plunder will be fully compressed in the lifter body and you won't have any cylinder compression. (cause the valve is open all the time).
Adjust the intake valve when the exhaust lifter just begins to open (rise)
set the exhaust rocker when the intake just closes (just go back on seat).
For each cylinder.
It is not nessessary or advised to try to fill the lifter body with oil.
But do not forget to oil up the lifter roller wheel, lifter bores in the block, pushrod seat and rocker roller or ball. Use engine oil.
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Old 08-21-2008, 08:06 PM
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I have two engines with the " HOT CAM " from the factory and they are not very lumpy or worth the trouble to change too IMHO. My ZZ430's go real strong but if they had more camshaft ... they would FLY.

just my nickel ...
Deuce
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