Bent pushrod?

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07-04-2013, 11:00 PM

#21

wpe

Teching In

Join Date: Feb 2011

Location: Portland OR

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Quote:

Originally Posted by dcam503

so its looking like im gonna need to take the heads off?? also, im gonna need to pull the cam out to find out what it is so that i can replace lifters and springs? This is starting to sound pretty expensive... I doubt i will be able to fix it for a few months at the $1500 its looking like i will have to spend according to you guys. its my dd, honestly i dont have the money to just throw at the car to replace parts that are working fine. as far as im concerned, i dont drive it hard, havent sprayed it yet, and besides the bent pushrods the engine seems to run fine. Im really starting to doubt that the car even has a built motor. i mean, who would port ls6 heads and pay for a custom solid cam and then put the stock fuel rails and coils back on? I think dude was full of ****. I got got, he prob only did cam, nitrous, tb, exhaust and googled a local corvette shop and said they did all the work.

so either way its not a fix i can do in one day if i do springs and lifters and need to measure everything and take the heads off and blah blah blah so im gonna take up actual shop space at that point.. smokinponcho, you ok with my car being there for a couple days once i get the funds together to fix it or will i need to be done and out in a day?

realistically guys, if the springs and lifters are in good shape, whats the downfall to just replacing the pushrods? what would make them fail faster than before i bent the pushrod or does having the bent pushrod mean they are more than likely damaged too?

Im going to go ahead and assume that its just a small cam and not a solid. i will risk it based on other parts used on build. honestly, i have seen salvages car run and i will take his word for it and go for the ls7's especially if they are good quality and cheaper.. I will not buy top of the line anything, just throwing that out there. I dont plan on keeping this motor past 100k miles regardless so im just looking to get another 20k out of it and 2 years, then im gonna go with a sc383 build or ls7 build.. right now, i need it to run like it was, i dont plan on racing every weekend or even every month. its my dd, I will upgrade a little but im not into name brand but I wont buy junk either.. i dont need to be the fastest.

thanks for all the advise and help so far. sorry if im being difficult but i have to be very careful how i spend money right now with my wife being prego and me wanting to keep the vette.. probably cheaper to buy a pos dd and store the vette till i can afford afr's.. might have to do that if I do end up having to replace everything..

First thing I would do is to determine if you really have bent push rods. If you do, the next thing to do is to determine why the push rod bent. If you have hardened aftermarket push rods and you do in fact have a bent push rod. There is a reason it would be bent.

They just "don't" bend on their own. A typical reason would be if the piston smacks the valve while its open, that in turn shoves the valve back up against the rocker arm and in turn it tries to shove the push rod back against the lifter and so on. Well obviously if the lifter is up and the cam lobe and the valve pushes back the weakest point is going to be the push rod so it bends. 99.9% of the time a push rod bends because of some mechanical interference, such as when a timing chain breaks and the engine continues to rotate a couple revs due to inertia, pistons come up and hit the open valves, bending valves and sometimes push rods.

Quote:

Originally Posted by *02WS6TURK*

Good to see some of you are having good luck with them. I know a couple local guys that have had them fail more than once running mild cams. It's hit or miss from what I have heard from local friends and guys online. Nobody is saying you have to spend top dollar on lifters. We are just simply passing along information and feedback.

I'm just saying that I have been using the LS7 lifters since 06 and have not had a single failure of any one of them that I have sold. **** happens and things break, especially in cars that are beat on. I don't care what kind of parts you use, things do break from time to time. I have seen $600 morels break, so even they are not fool proof. From what I have seen, the GM LS7 lifters have a proven track record for me. As I mentioned earlier I have several Z06 customers running their cars on the road course for 30 minutes at a time going as fast as they can, and to date have not had one failure other than the ones I mentioned and they weren't LS7 lifters.

Some have used the GM Cadillac race lifters, they fail as well. I know of two customers that replaced them with LS7 replacements. I used them in my engine and lost oil pressure on start up. Replaced the lifters with LS7 units and my oil pressure returned to normal. This happened in 07 after a head and cam swap in my personal Z06, tore my hair out trying to figure out where the oil pressure went.

On another note, if you think aftermarket rockers are the **** to use, don't count on it, I have three sets of yella terras on these track LS6 cars that has broke over the years. I tell the customers to stay away from them. Stock LS rockers are tough, I have never seen one break other than the 07 LS7 rockers spitting bearings out. Aside from four actual failures of these in LS7 engines only, those were the only GM rockers to have failed in my area that I know of.
If you want higher quality rockers step up to Crower or Jessel shaft rockers, however even those have broke. I don't even use trunnion kits, that was a hot seller when the issue with the LS7 rockers came about, I just replace them with new GM LS7 rockers. katech uses stock GM LS7 rockers in their track, and street attack engines all the time. If you were to buy a Katech track attack engine it would cost you $25K. Thats gotta tell you something if Katech is using GM rockers in their engines.