6.0l block question
Found this with a quick search. 
Also this...
http://www.chevyengine.com/chevysmallblock.htm
Casting number is on the drivers side of the motor on the back of the motor right below the drivers side cylinder head. Heads could have been changed for XYZ reasons which is why I would use the block if you have a casting number of 12550592 early 98 or 99, or 12559090 it is late 98 early 99. Casting numbers 125555846 is used from 99-00 and some in the 98 motors. Numbers 12559378 is 00-01 LS1 block and 12561168 which is the LS6 block from 01+
http://www.chevyengine.com/chevysmallblock.htm
Last edited by djsanchez2; Jun 26, 2010 at 05:24 PM.
To determine the year of the block, there is a 4 digit casting number on the front of the block just below the passenger side head. It's a letter followed by 3 numbers. The letter tells you the month (ex. A= January B= February & so on I believe they skip "I") the next two are the date and the last digit is the year. For example mine is F203 which means is was manufactured on June 20, 2003.
Thanks guys.
I have a 12551364 and the number under the head is I092. So I guess it is August 09, 2002 so would it be a 2003 model year or 2002? I am wanting to get a rotating assy for it and I want to get the right crank.
I have a 12551364 and the number under the head is I092. So I guess it is August 09, 2002 so would it be a 2003 model year or 2002? I am wanting to get a rotating assy for it and I want to get the right crank.
You will need to buy a rotating assembly and other parts for an 02 since that was the date of manufacture. Even though I don't think there is any difference be the those two years. They both have 24 tooth reluctor rings
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not to hijack...but i was wanting to know this,.. so if i came across a good deal on a 99-00 shortblock, with intentions of stroker kit anyway, i don't need to worry about this "spacer" on the crank difference between the years?
Is this the only difference in blocks over the years?
Is this the only difference in blocks over the years?
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Verdad Gallardo the spacer on the crank was only on 99's and early 2000's i beleive. this was to mate it to the 4L80E. if your going to put it behind a 4L60E or a T56, you wont need the spacer. so if it comes with the spacer, take it off and send it to me because i need it.
Does it have any bearing on using an LT1 4l60e? I have a good one and don't know if i can use it or look for LS version?
