Nites Lm7 Build

Old 07-10-16, 04:16 PM
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Nites Lm7 Build

So I've been in and out on actually going the V8 route or not. I'm yet to decide wether or not I want to actually jump on the idea, I've found a Lm7 engine block for a few Jeffersons so I had to buy it.

These are the specs of the engine 01 gmc lm7 from a Burban with 706 alum heads. I was told it was removed because it had low compression not sure if it was on 1 or multiple cylinders. Prior from buying it I was told that it had recently seized from being left outside in the rain. Although it seems like a bad investment I see it as a learning experience best of all it was cheap LOL.

So the project has started like this. Me being overly excited to start working on this new project I began tearing it apart starting with the oil pan and heads.
(Got carried away should of poured marvel mystery oil in the spark plug prior from removing the heads)

My first objective was to try and unseize the engine. With the heads off I poured a significant amount of Marvel Mystery oil directly to the cylinders enough to fully submerge the pistons I did 1day1/2 on each side of the engine in between days I gave the flywheel a few back and forth motions until it released. Its a little on the stiff side as I can't turn the pulley by hand I need a crow bar and turn the engine from the flywheel. I'm still soaking the pistons with marvel hopefully it gives me less resistance. On a few pistons the oil leaks out after a while my guess these pistons need new rings and causing the low compression

(Would I still be able to do a compression test after I have removed the heads and removed the remaining graphite gasket from the block)

I found a very fine metal brush and I'm lightly using it to remove any carbon build up on the pistons I'm carefully running it around the edge of the piston to remove if any carbon build up that is between the piston and cylinder walls with the piston at top dead center to prevent any damage to the walls.

I'm most likely going to remove all parts and have a machine shop tell me the damage of this block if it worthy enough to rebuild. I plan on doing a turbo setup so hopefully it's rebuild able and I don't need a large bore and kill my hopes of going turbo LOL
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Old 07-18-16, 03:32 AM
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Engine torn apart getting her ready for the machine shop heads were taken apart along with Pistons unfortunately I need to get a pulley puller to access crank and cam meanwhile I've been doing a fair share of parts cleaning. I now hate graphite gaskets
Nites Lm7 Build-image-253580092.jpg Nites Lm7 Build-image-2840775331.jpg

Cleaned one of the heads with degreaser only from the exterior portion. I still need to disassemble the heads. To polish the valve cover or not??
Nites Lm7 Build-image-1714187576.jpg

What are these heads worth as is and how much for these same heads but ported from exhaust and intake side
Nites Lm7 Build-image-1900309038.jpg

I've managed to clean the Pistons with Berryman parts cleaner degreaser, paint thinner, wd-40 and a scotch brite pad how much should I clean them up can I damage the Pistons if I clean them too much I left a thin layer of I'm not sure if it's residue or a protective layer on this piston. It can clean up more if I want to get a cleaner look just I'm not sure if that is something that can cause problems
Nites Lm7 Build-image-4173758688.jpg

Some scars from piston slap my guess This is my main reason for wanting to get the block honed you can still see the original cross marks on the cylinder walls not sure what the mileage was when pulled
Nites Lm7 Build-image-4253276599.jpg

This is another piston that I had decided to clean much better it has a better shine giving me the impression it's cleaner lol. I'm not sure if I did any sort of damage, or if this is how they should all look after cleaning
Nites Lm7 Build-image-3819348775.jpg

Better picture
Nites Lm7 Build-image-429701014.jpg

Last edited by 87nitefc; 07-18-16 at 05:15 AM.
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Old 07-18-16, 11:19 PM
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Based on the following pictures how many miles would cause this amount of wear? Nites Lm7 Build-image-3625911944.jpg Nites Lm7 Build-image-1648094647.jpg You could see easily where the Pistons had been slapping the walls.
Attached Thumbnails Nites Lm7 Build-image-1912621276.jpg   Nites Lm7 Build-image-2722637216.jpg  

Last edited by 87nitefc; 07-19-16 at 01:39 PM.
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Old 07-21-16, 08:35 AM
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nice work so far, that wear looks pretty bad
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Old 08-29-16, 12:13 AM
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Originally Posted by Freeskier7791 View Post
nice work so far, that wear looks pretty bad
I was thinking maybe a good hone job would work best do you think i need to get it bored out instead
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Old 08-29-16, 01:16 PM
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I would think a hone would clean it up, I would ask an engine shop though.
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Old 09-08-16, 08:01 PM
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Im planning on running these pistons but i was tould i need 1.2top 1.5 2nd piston rings yet on ls1tech they mention that 1.5 top and 1.5 2nd piston rings are needed when searching there isnt many options that offer 1.2 / 1.5 rings
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