Bottom end of engine - Page 3 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 09-18-2004, 12:12 PM   #21
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Hey, Doc, still got your old pistons/rods?
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Old 09-18-2004, 05:52 PM   #22
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No I don't but I have a fair handfull (5-6) pics of the new ones which were exactly the same sans production, makeup, coating, yada
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Old 09-19-2004, 12:51 PM   #23
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Why yes...yes I do:



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Old 09-19-2004, 03:31 PM   #24
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Looks huge in that pic for some reason....

I may be running home today, so i'll grab it if i do. Looks about the same.
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Old 09-20-2004, 01:07 AM   #25
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So, if I were to only use the bottom end of a NA engine and used my pistons, rods, heads and the rest of my top end, then this should work in theory? THe compression should be the same since it seems that the piston heads are what changes it. My mechanic says that it will work. If I do go this route, then I will get pictures of both piston heads when he takes it apart.
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Old 09-20-2004, 02:49 AM   #26
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We still just looking at pictures and what we remember. I think the biggest issue can be the rods. If the rods are the same, then you can throw as much boost at it as an L67 really.

Frankly an L67 or longblock etc would be an easy and cheap find. About 300 bux if you shop right. Takes the guesswork out, until we get this taken care of.
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Old 09-20-2004, 10:22 AM   #27
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That'* my intention is to look around for a nice L67 block or even whole low mileage engine. It is my father, who has the car currently at the shop, who is pushing to get it done. Personally... I'd rather wait and spend my time and money looking into a northstar swap.
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Old 09-20-2004, 12:19 PM   #28
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Quote:
Originally Posted by jr's3800
If memory serves the block & crank should be pretty much the same.... The rods, pistons and wrist pins are a bit diffrent....

I think we have found that all of the stock pistons are cast, but it appears that the SC 3800 '* through 95 have a hardened piston from the second ring groove up..

I do like the piston in Dr Jays pic... It appears to be a Sealed Power piston with the anti scuff coating... Looks like a good choice to me...

Dr Jay are those sealed power pistons in your 3800 now?
Thanks and yes they are in it, and I believe they're Speed-Pro. Same company, different line. And as far as I've seen you're right on the block and I'm sure of the crank being the same. If the compression is the same I think the only issue left would be things like press-fit or floating pins and minor issues like that which wouldn't be an issue if you swap the entire assembly. Sound about right?
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Old 09-20-2004, 12:39 PM   #29
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Quote:
Originally Posted by jr's3800
I'm tempted to say swap the entire assembly.... Might be better off..

But on the wrist pins, I have found that the NA and SC wrist pins are .0001 diffrent in thickness... I can't say that this number is totally correct.... But everything I can find says yes..

But I would love to see a side by side comaprision of the L67 and L27 Blocks, Cranks, Rods, Pistons, Heads and the like.... I don't think the injector ports were built into the heads untill the Series II heads( SC'd Only )...
It would be very interesting to see all of the diffrences and simmilarities between the two engines..
I'm sure you mean .001 as .0001 could be taken off by washing any bacteria from the surface

I'd love to see them side by side too. You're right, the */C injectors are not in the heads, they're in the lower intake. I had a small chance to compare heads while looking into the Australian market. A guy there posted pictures for me so I compared them side by side to mine and they matched in every way. Of course I couldn't tell off-mark things from .0001" though I'll post the pictures and you can have a gander:








Neat info on these heads. This guy paid nearly 2 grand to have the valve guides sealed and redrilled so he could put larger valves in it...they get pretty wild with Series I down there

Do you have pics of the heads or need me to post mine?
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Old 09-20-2004, 12:40 PM   #30
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BTW, they never got the supercharged Series I so you're looking at n/a...incase that slipped by
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