Rats!!!!!!!

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DERICKS

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I bent one stinkin pushrod on my hydraulic flat tappet cammed 340...the rocker didnt back off so I dont know what happened. Any ideas???
 
same happened to me, but no adj. rocker. Was still within specs, but replaced anyhow. Probably overreved at some point. Don`t you use adjustable rockers on solid lifters only? or am I misunderstanding a performance trick?:scratch:
 
mopar head said:
same happened to me, but no adj. rocker. Was still within specs, but replaced anyhow. Probably overreved at some point. Don`t you use adjustable rockers on solid lifters only? or am I misunderstanding a performance trick?:scratch:
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Actually Mopar Head, If you do any deck or head work that changes the valve train geometry it is always advisable to go to adjustable rockers and custom length push rods. Adjustable rockers are also nice with hydraulic lifters cuss you set the lifter piston just slightly recessed which can limit lifter pump up and early oncet valve floatation at high RPM (sounds like a medical condition I should consult my doctor about):-D.

Terry
 
DERICKS said:
I bent one stinkin pushrod on my hydraulic flat tappet cammed 340...the rocker didnt back off so I dont know what happened. Any ideas???
Click to expand...

A couple things could cause this like a faulty pushrod but more commonly a tight valve stem to guide clearance causing the valve to stick for a millisecond when closing. This will cause a big clearance to be present between the rocker end and pushrod which usually bends the pushrod. Make yourself a tool and exercise the valve where the bend rod was and see if it's sticky. Also how many threads are showing on the bottom side of the rocker adjuster where the bent rod was.

Terry
 
demon seed said:
A couple things could cause this like a faulty pushrod but more commonly a tight valve stem to guide clearance causing the valve to stick for a millisecond when closing. This will cause a big clearance to be present between the rocker end and pushrod which usually bends the pushrod. Make yourself a tool and exercise the valve where the bend rod was and see if it's sticky. Also how many threads are showing on the bottom side of the rocker adjuster where the bent rod was.

Terry
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I inspected the lifter and the lobe the best I could and all appeared well. I replaced the bent rod with another and put it back together. I fired it and imedaitely began rapping again like it bent it again. I didnt have the time, energy, or enthusiam to open it back up and check if its bent. I will do that tomorrow. The rocker has 1 and a 1/2 threads showing out of the bottom, roughly the same as the rest
 
I got one rocker not reaching full lift and when I tried to get the lifter out with a magnet its stuck in the bore :( It sounds like a flat lobe, there goes the vette race in may
 
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