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View Full Version : Got a surprise today


Cliff30thZ
10-08-2013, 08:45 PM
I have been working on swapping out some external parts from my stock rebuilt 95 LT1 to my built 97 355 LT1. I wanted to swap the timing cover over so I took off the pan from the 95. When I did I was greeted with a surprise, it had 4 bolt mains. Now I am not the original owner of this car. I bought it in 05 with 140K miles on it and in need of a rebuild. When I removed the engine I don't recall any signs of previous removal to lead me to believe it been out before. I had seen some people say their f body came with factory 4 bolt mains, but had never seen 1 before. Has anybody else found one.
ZOHAN
10-09-2013, 12:04 AM
As I'm aware, none of them came with a 4 bolt main. However, if something happened, and there was an insurance claim on the engine, (suck water into intake and such) it could have possibly ended up with a gmpp 4 bolt block. Thats what happened with colin, nocturnalZ

Making you silky smooth...
MeanTA
10-09-2013, 01:23 AM
It must have been a replacement from GM.

Only 97 LT4 equipped F-Bodies got 4-bolt mains.
RamAir95TA
10-09-2013, 05:59 AM
Corvette LT1s came with a 4-bolt block also.
ginoz28
10-09-2013, 06:08 AM
My motor out of my 95 has 4bolt mains also.

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SexyTransAm
10-09-2013, 07:11 AM
kick ass
blkchevyz
10-09-2013, 08:31 AM
My motor out of my 95 has 4bolt mains also.

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my fiends 95 had a 4 bolt as well. i remember reading production ran low of 2 bolts so they would swap in the 4 bolt blocks from the vettes.
gunters96lt1
10-09-2013, 09:13 AM
Lucky!!


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ZOHAN
10-09-2013, 09:57 AM
Wish I woulda been that lucky... haha

Making you silky smooth...
beaver50
10-09-2013, 11:33 AM
happy for you
ThoR294
10-09-2013, 05:55 PM
lucky goose :P
Cliff30thZ
10-09-2013, 06:02 PM
my fiends 95 had a 4 bolt as well. i remember reading production ran low of 2 bolts so they would swap in the 4 bolt blocks from the vettes.

I had read that also but never seen 1 in person. When I pulled it out in 2005 for the rebuild I never even looked at it, just dropped it off at the machine shop and picked it up when it was done. I needed 1 rod and piston and rings and bearings. 24445
dawdaw
10-09-2013, 06:21 PM
Got one sitting in my pole barn... I'm having a brainfart but the guy told me it came out of his Camaro, but I can't remember the year. Could've easily been swapped from a vette though.. any way to determine what it came from by a casting # or some identification?
Ugod02010
10-11-2013, 07:20 AM
There's a no. By the oil filter. I found a website b4 that u put the no. In and it tells u if Pontiac or chev. An what yr also 2or 4 bolt. Can't remember the website just google for engine no. Identification for lt1
Injuneer
10-11-2013, 10:24 AM
Shoebox has the info for decoding the partial VIN on the block. It will show Chevy or Pontiac, but it doesn't appear to tell you if the Chevy was an F-Body, Corvette or SS/Caprice. This would be the partial VIN from the vehicle the engine was originally installed in. I suspect the "replacement" engines will be marked differently or not marked at all.

http://shbox.com/1/block_vin.jpg
Ugod02010
10-11-2013, 07:48 PM
^probably where I got my info.
But I think it also said the manufacture year
Injuneer
10-12-2013, 12:09 PM
^probably where I got my info.
But I think it also said the manufacture year

Click on the link I posted and you will see that is does have a letter code for the year.