LT1-LT4 Modifications 1993-97 Gen II Small Block V8

Initial start and lifter break in

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Old 05-02-2009, 08:38 AM
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Default Initial start and lifter break in

so far everythings looking good to have my engine fired by tomorrow. its a fully rebuilt long block. what break in for the lifters would you guys recommend ?
Old 05-02-2009, 09:05 AM
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Hydraulic lifters don't need any real break in. I'd run the engine around 2,000rpm for a minute or two to ensure oiling of the camshaft and to seat the valve springs. Just take it easy for the first couple hundred miles, change the oil, and let it rip.
Old 05-02-2009, 09:18 AM
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thanks ramair. my builder said keep it around 1500 for about 15 minutes. im going to keep the valve covers off and make sure that its getting oil up top.
Old 05-02-2009, 09:33 AM
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Originally Posted by SoxXpupPeT
thanks ramair. my builder said keep it around 1500 for about 15 minutes. im going to keep the valve covers off and make sure that its getting oil up top.
Did you prime the oil pump long enough? You'll usually want to spin the pump enough and long enough to get oil up into the cylinder heads, making sure the valvetrain is lubricated BEFORE start-up. Some people say that spinning it until you have oil pressure is enough, but that wasn't good enough for my builder.
Old 05-02-2009, 11:14 AM
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Honestly with the roller cams, as long as you prime your engine you don't need to do a 2k rpm for any period of time, start it and idle it, but why not run it at a higher rpm to ensure oil is getting everywhere? Just let it idle high for a few minutes and you should be good.
Old 05-02-2009, 11:40 AM
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alright guys thanks for the feedback. im going to prime it once i have everything bolted on before i put the intake on. ill be sure to also pour oil ontop of the rockers before i prime it
Old 05-02-2009, 12:19 PM
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I would not baby it during break in of a new engine.
Old 05-02-2009, 01:04 PM
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Originally Posted by bombebomb
I would not baby it during break in of a new engine.
what would you do ? dump the clutch at 5k ?
Old 05-02-2009, 03:22 PM
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Originally Posted by My95Z
Honestly with the roller cams, as long as you prime your engine you don't need to do a 2k rpm for any period of time, start it and idle it, but why not run it at a higher rpm to ensure oil is getting everywhere? Just let it idle high for a few minutes and you should be good.
He has a "fully rebuilt long block". He will want to keep the revs up for break-in of everything.


SoxXpupPeT: heed the advice of not babying it on break-in. Too much babying will lead to rings that don't seat.
Old 05-02-2009, 04:35 PM
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Originally Posted by shbox
SoxXpupPeT: heed the advice of not babying it on break-in. Too much babying will lead to rings that don't seat.
Good advice.

I run heavier 10/30 oil for break-in. I run the motor at 1500-2500 for 10-15 min and get the temperature up. I then let it cool and run it for another 10-15 min until the temperature is up again. This will help seat the rings. I then drive the car around a little to make sure that nothing is out of place. Then I change the oil and filter and go racing.

It is a good idea to have someone on the outside of the car to look for leaks. I would leave the valve covers on if you don't want a mess.
Old 05-02-2009, 05:21 PM
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Originally Posted by SoxXpupPeT
what would you do ? dump the clutch at 5k ?
Well, I personally let it run for around 30 minutes (tuning) then I pulled it out and laid into it. Could not resist. Anyways since then I have been driving it just like I normally would.

Also, like the above poster said, check for leaks etc, it is best to have a buddy there which I am guessing you will.

P.S. I have no clutch to dump.

Last edited by bombebomb; 05-02-2009 at 11:08 PM.
Old 05-02-2009, 06:28 PM
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Originally Posted by shbox
He has a "fully rebuilt long block". He will want to keep the revs up for break-in of everything.


SoxXpupPeT: heed the advice of not babying it on break-in. Too much babying will lead to rings that don't seat.
Yep I know, that is why I said why not do it. I didn't say don't do it I was just saying even though the cam doesn't requier it its still not a bad idea and their is really no disadvantage to doing it. Sorry if my wording was confusing.

Oh and for the ring break in if they are moly rings they might recommend several WOT passes, but keeping the rpm's low. This will be easy for you since its a manual.
Old 05-02-2009, 08:46 PM
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thanks for all the good advice guys. im going to be running 10w-40 castrol non synthetic. unless a 10w-30 would be better. i still have until mid day tomorrow (if everything goes smoothly)before i run it. thanks again guys!
Old 05-02-2009, 09:29 PM
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10W-40 is fine



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