L27 Modding/Rebuild - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


Performance, Brainstorming & Tuning Talk about modifications, or anything else associated with performance enhancements. Have a new idea for performance/reliability? Post it here. No idea is stupid! (please use Detailing and Appearance for cosmetic ideas)

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Old 02-02-2008, 06:24 PM   #11
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Your PCM will be fine with the rockers if that'* what you're asking. It'll learn that. Well within it'* capabilities, but it'll take a hundred miles or so.


Just remember that there are hidden and surprise costs involved. Plan on 10-15% more for unaccounted bits and pieces, and don't forget to factor in fluids, gaskets, and sealants.
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Old 03-15-2008, 12:14 PM   #12
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Brought my old thread back, if ya don't mind .

So my pushrods are more or less trash.
Just snooping around a bit, but are the pushrods the same throughout the 3800 time line?
I was looking at the INTENSE 3800 High-Performance Pushrods.

Also, I think I'm gonna have a go at smoothing the runners on my LIM, anything I need to know? I wasn't looking at porting them really, there isn't much to take off anyway is there? I was just gonna get rid of the rough stuff.
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Old 03-15-2008, 12:44 PM   #13
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In reverse order:

Port match the LIM outlets to the heads slightly UNDER. Shoot for .85" by 1.85" (head ports are .9"x1.9"). Use a combination of dremel bits to smooth the runners. Stay away from grinding STONES. Use carbide bits and abrasive/sanding drums and flap sanders.

No, pushrods are not the same across the lines. Deck heights are different, dictating different pushrods.

GM no longer stocks Series 1 pushrods:
http://www.bonnevilleclub.com/forum/...=vintage+parts

You can get OEM pushrods from there, or here:

http://www.bonnevilleclub.com/forum/...ic.php?t=94759


For the price, I suggest a wrecker or another member. OEM pushrods are plenty durable for what you have planned. I went to a CUSTOM LENGTH, dictating a move to Smith Brothers.

I'd like to know what makes your trash. I've never seen a trashed S1 pushrod unless the motor COMPLETELY self-destructed and was driven that way.
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Old 03-15-2008, 12:50 PM   #14
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The pushrods were in real good shape when I put them in, and the lifters were new. Unless the lifters totally failed, the pushrods should not have sustained any damage.

If you need/want the original lifters, they are sitting in an oil bath somewhere in my garage.
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Old 03-16-2008, 01:31 PM   #15
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Honestly I'm not sure. Dad said we'd probably be looking for new ones. What I know is when I got the LIM off dad came over and started rotating the purshods and we could feel a bump on near half of them. Dad said they should be rotating and that the bump is a sign that they stopped rotating and wore down one spot. After that the top end stuff was set to the side and we hadn't talked about it.

The lifters are still good we bagged those and set them away for the time being. The pushrods are bagged as well. Maybe it was the rockers? I don't know. I'm still learning about all this. There was one rocker where the pivot roller seems to have stopped rotating as well, on the #2 Cylinder, the corresponding push rod on that felt the worst bump.

This one:
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Old 03-16-2008, 01:39 PM   #16
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That rocker doesn't mean anything. The rocker can still pivot. The bearing freewheels wherever it wants.
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Old 03-16-2008, 01:52 PM   #17
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Just wen out and asked dad specifically why (I didn't realize he was home, otherwise I woulda asked about it before I last posted, lol). But I understand it more now. The we rotated the pushrods in the assembly and when you rotated them about 6 or so would stop and you would have to push a little harder to move it more. Something was binding on them and they are wearing down one spot. So we think its probably in the rocker that that notch is worn in, since the lifters are new and we couldn't feel it when we put a rod to the lifter outside the motor.

Well the rocker thing i guess is coincidence that the worst 'bump/notch' was under that one. But thats our reasoning for new/different pushrods. We already tossed the ones out of the other motor
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