92 sc block shot ...can I use nsc block???? - Page 2 - 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 04-19-2007, 12:20 AM   #11
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Quote:
Originally Posted by 92 SSE! mo Charger
Im sure the sc has flat top pistons and beefed up rods. hopefullly with a 30 over bore done to the non sc block and using new sc pistons and rods will add a few more horses. i will search for a scat crank "just incase" is it easier to pull motor up or drop the sub frams out bottom?
don't go past 20 you risk damaging the block
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Old 04-19-2007, 01:07 AM   #12
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First... The crank and block are the same between the 92 NA and SC Motors... The heads are also the same..

The Rods and pistons are different..


You do not want to use Flat top pistons unless you plan on running lower boost via a larger pulley.. These engines Have 8.5 : 1 Compression and that means dished pistons... When you throw in the boost you can be as high as 11 : 1 Compression with the SC...

Do not get too carried away with the over bore.... Only go as far as you really have to...


On the crank, if it has to be turned down .020, consider it garbage

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Old 04-19-2007, 08:34 AM   #13
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Quote:
Originally Posted by jr's3800
The heads are also the same..
Just a quick correction..the heads are not "exactly" the same. The difference is two extra holes in the intake manifold flange that pass PCV to the intake manifold. You can add them to the N/A heads by carefully drilling them (use your SC heads and the gaskets as a reference to locate the holes.) This is one of those deals where GM used the same casting, but did a little different machine work to them. You don't have to be exact on the hole sizes, it'* just to route the crankcase blow-by into the PCV system. If your care full and start with a small drill bit, you can even do this with a hand drill.

The rest is true. The block and crank will interchange. The rods, pistons, and balancer should be changed to the */C specific parts....or run the N/A parts on a lower boost level (to compensate for the higher base compression of the N/A motor.)
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Old 04-19-2007, 09:33 AM   #14
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Compression is no different between the L67 Series 1 and the L27. They are both 8.5:1.
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Old 04-19-2007, 09:54 AM   #15
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Quote:
Originally Posted by clm2112
Quote:
Originally Posted by jr's3800
The heads are also the same..
Just a quick correction..the heads are not "exactly" the same. The difference is two extra holes in the intake manifold flange that pass PCV to the intake manifold. You can add them to the N/A heads by carefully drilling them (use your SC heads and the gaskets as a reference to locate the holes.) This is one of those deals where GM used the same casting, but did a little different machine work to them. You don't have to be exact on the hole sizes, it'* just to route the crankcase blow-by into the PCV system. If your care full and start with a small drill bit, you can even do this with a hand drill.

The rest is true. The block and crank will interchange. The rods, pistons, and balancer should be changed to the */C specific parts....or run the N/A parts on a lower boost level (to compensate for the higher base compression of the N/A motor.)
For the 92 L27 and L67 they used the same PCV system unlike the 90-91 LN3 that had the heads without the Passages

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Old 04-19-2007, 08:56 PM   #16
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Quote:
Originally Posted by jr's3800
For the 92 L27 and L67 they used the same PCV system unlike the 90-91 LN3 that had the heads without the Passages
Ooops. I stand corrected. I guess I'll go crawl back under the Camaro and keep my yap shut.
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Old 04-20-2007, 03:40 PM   #17
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Quote:
Originally Posted by clm2112
Quote:
Originally Posted by jr's3800
For the 92 L27 and L67 they used the same PCV system unlike the 90-91 LN3 that had the heads without the Passages
Ooops. I stand corrected. I guess I'll go crawl back under the Camaro and keep my yap shut.
Took me a long while to figure out the differences between the LN3 and L27.. Its amazing how that little change could get rid of PCV hoses and the like..

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Old 04-20-2007, 07:17 PM   #18
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Quote:
Originally Posted by jr's3800
Took me a long while to figure out the differences between the LN3 and L27.. Its amazing how that little change could get rid of PCV hoses and the like..
Yeah...just when I think I have a handle on the particulars on each revision of the 3800, along you guys come and blow one of them out of the water.

(Back when I was contemplating doing the top end swap on the LN3 using a M62 SC, I kept finding two part numbers for the heads...one specific to the the SC, one for the NA..so I figured they came from the factory that way...NA'* without the PCV, SC with the PCV. Had I realized the NA L27 came with the holes in the heads too, I would have yanked a pair in the local yards instead of working around the PCV system.) I think I'm going to take a few tylenols and go climb back under the car.
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