LS1 push rods question
03-19-2008, 10:44 PM
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LS1 push rods question Has anyone ever heard of the stock LS1 push rods bending after hitting the rev limiter? If so can you explain why.
03-19-2008, 11:24 PM
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I am getting ready to do a heads and cam swap and have new chrome moly ones for then but and just wondering. I don't think I am hearing a push rod knock but and not sure yet. I hit the rev limiter pretty hard this past weekend at the track. The car is running pretty crappy but is showing some codes now that point to something else.
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03-20-2008, 02:12 PM
#10
You very well could have bent a pushrod, or broken a valve spring. Both are common issues. Are you getting a misfire code?
Did you just miss a shift or did you do the 2-3-2 shift?
Did you just miss a shift or did you do the 2-3-2 shift?
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03-20-2008, 05:20 PM
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I am getting a misfire in multi cylinders with a lean in banks 1 and 2 code. The car has a TH350 with a manual valve body. The shift from 1st to 2nd was a little late and it hit the rev limiter and about shut the car off. It was pretty hard, I have never done that before. But the car was already running crappy and it didn't get any worst after that happened.
03-22-2008, 11:42 PM
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Well I can't be 100% sure that it was not a push rod but today I changed the old TR6 plugs out and put some new TR5's in and new Holly 8mm wires and the car seems to be running great.
03-24-2008, 09:55 PM
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Well after a couple of days the car started having the multi cylinder misfire code again. I hook it up to the laptop and took it out for a ride. It showed misfires in all cylinder but mostly in number 3. I can now hear a weird sound from the top side of the motor like a valve train problem. I do now think I broke a Pushrod and most likely number 3 or a spring. I am gonna tear the valve covers off tomorrow or Thursday and pull the old Pushrods and replace them with Chrome Moly hardened Pushrods.
03-25-2008, 08:11 AM
#14
That's a good idea. Inspect your valve springs while you are in there especially if you don't find any bent pushrods, sometimes one can be broken but hard to spot.
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03-25-2008, 08:18 AM
#15
Not necessarily...I've had my rev limiter set to 6350 RPM for the better part of a year, and have hit that mark more than a few times. I just pulled all of the pushrods to check them, and they are all still straight. No broken valve springs, no nothing.
03-25-2008, 10:44 PM
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Well I pulled the valve covers off to find no broken springs or any bent pushrods. I went ahead and replaced the push rods with the new ones. The car doesn't seem to run much different, but I will hook it up to the computer Thursday after I get off work and see if the misfires have gotten any better. Anyone else have any more input as to what else could be going on here.
