Help me id this dmax motor

UPnGONe

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Jul 23, 2008
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so im tryin to figure out what model motor this is for a guy, pistons on drivers side have arrow pointing into the valley and one ecthed into the piston facing toward the front, here are some pics gm cant do anything with the numbers ive given them
 

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Cougar281

Well-known member
Sep 11, 2006
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St Louis, MO
Nothing stands out to me, although looking at the water pump, it MAY be a LB7 or LLY, but then it's hard to tell the size of the outlet in the pic.
 

THEFERMANATOR

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Feb 16, 2009
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Appears to be an 03+ style block as I don't see the fitting for the oil pressure sender behind the water pump, but I would say it's an LLY as the oil pan doesn't have any of teh sound dampning material on it like my LB7 had. I know the later trucks did away with the hard plastic coating on the oil pans.
 

blk smoke lb7

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Nov 8, 2010
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belvidere,ill
I believe you can use that for what ever engine you want.just have to use the flywheel for which ever engine you want and make sure the heads you want to use fit correctlly,i was told i could use a lbz block and have my lb7 head machined to fit.The bad part is if you start pouring the h.p. to it then you have to worry about lb7 rods or lbz pistons.This is only what i have been told you would want to confirm these facts before proceding. good luck ;)
 

blk smoke lb7

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Nov 8, 2010
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belvidere,ill
Appears to be an 03+ style block as I don't see the fitting for the oil pressure sender behind the water pump, but I would say it's an LLY as the oil pan doesn't have any of teh sound dampning material on it like my LB7 had. I know the later trucks did away with the hard plastic coating on the oil pans.
I have an 04 lb7 with no sound dampning on the oil pan
 

jdlover1

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Oct 4, 2006
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chapanoke,nc
I'm going with 03-early 04 lb7 since there is a crankcase vent tube coming from the front cover behind the harmonic balancer
 

JoshH

Daggum farm truck
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Feb 14, 2007
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I'm going with 03-early 04 lb7 since there is a crankcase vent tube coming from the front cover behind the harmonic balancer
I think that's the plastic piece that the battery cable and starter solenoid wire run through.
 

schulte

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Jul 31, 2010
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I believe you can use that for what ever engine you want.just have to use the flywheel for which ever engine you want and make sure the heads you want to use fit correctlly,i was told i could use a lbz block and have my lb7 head machined to fit.The bad part is if you start pouring the h.p. to it then you have to worry about lb7 rods or lbz pistons.This is only what i have been told you would want to confirm these facts before proceding. good luck ;)

LBZ-LMM-LML are balance a lot differently than LB7-LLY, you can't just swap flywheels.

LBZ-LMM-LML also have 1 more teeth on the crank reluctor wheels, you'd have to change that out.

In order to run an LBZ-LMM-LML with LB7-LLY heads, you'd have to have the entire rotating assembly be LBZ-LMM-LML or be LB7-LLY, and replace the crank reluctor wheel with an LB7-LLY wheel and replace the cam/crank sensors.

Additionally, a LBZ-LMM-LML front cover won't take a LB7-LLY water pump.

LBZ-LMM-LML rods are stronger than LB7-LLY, but the pistons are not.

If you want to "budget build" a motor for a LB7-LLY truck, your best bet is to get a LBZ block (stronger), LB7-LLY crank (better balance) with LBZ rods (stronger) and LB7-LLY cut pistons (less melting) LB7-LLY flywheel/flexplate LB7-LLY balancer, LB7-LLY front cover and water pump with LB7-LLY reluctor wheel, have the rotating assembly balanced, and run some head studs.
 

blk smoke lb7

<-----Lots of green $
Nov 8, 2010
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belvidere,ill
Appears to be an 03+ style block as I don't see the fitting for the oil pressure sender behind the water pump, but I would say it's an LLY as the oil pan doesn't have any of teh sound dampning material on it like my LB7 had. I know the later trucks did away with the hard plastic coating on the oil pans.

LBZ-LMM-LML are balance a lot differently than LB7-LLY, you can't just swap flywheels.

LBZ-LMM-LML also have 1 more teeth on the crank reluctor wheels, you'd have to change that out.

In order to run an LBZ-LMM-LML with LB7-LLY heads, you'd have to have the entire rotating assembly be LBZ-LMM-LML or be LB7-LLY, and replace the crank reluctor wheel with an LB7-LLY wheel and replace the cam/crank sensors.

Additionally, a LBZ-LMM-LML front cover won't take a LB7-LLY water pump.

LBZ-LMM-LML rods are stronger than LB7-LLY, but the pistons are not.

If you want to "budget build" a motor for a LB7-LLY truck, your best bet is to get a LBZ block (stronger), LB7-LLY crank (better balance) with LBZ rods (stronger) and LB7-LLY cut pistons (less melting) LB7-LLY flywheel/flexplate LB7-LLY balancer, LB7-LLY front cover and water pump with LB7-LLY reluctor wheel, have the rotating assembly balanced, and run some head studs.
I knew each motor has plus's Thanks for making it more clear:thumb:
 

UPnGONe

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Jul 23, 2008
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ok i was told that the pistons look to be lb7 bc of the lil triangle on the pistons that poi=nt to the valley, and lil arrows that point forward on the opposite side of the piston, my plan is to cut n cut the stock pistons and put some lbz rods in and use my lbz front cover and lbz heads and runners thats my plan for the motor
 

x MadMAX DIESEL

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Dec 30, 2008
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FWIW the pistons on the LB7 and LLY are the same... Also those arrows just show which way to install them, I haven't seen LBZ-LMM pistons in person yet. But the LML piston also has the direction marks, that being said I would assume the LBZ pistons would too. Couldn't you just look for numbers cast in the block for info?
 

ripmf666

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Sep 20, 2006
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FWIW the pistons on the LB7 and LLY are the same... Also those arrows just show which way to install them, I haven't seen LBZ-LMM pistons in person yet. But the LML piston also has the direction marks, that being said I would assume the LBZ pistons would too. Couldn't you just look for numbers cast in the block for info?


01-05 lb7 and lly use 4 rights and 4 left hand pistons the Lbz and Lmm you can use the same piston in any of the hole there is no markings like the Lb7 and LLY. The LML piston now say 4 rights and 4 lefts and have a mark.
 

UPnGONe

New member
Jul 23, 2008
196
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The shore
FWIW the pistons on the LB7 and LLY are the same... Also those arrows just show which way to install them, I haven't seen LBZ-LMM pistons in person yet. But the LML piston also has the direction marks, that being said I would assume the LBZ pistons would too. Couldn't you just look for numbers cast in the block for info?

i have given gm every number on the block they cant do nothing with them the numbers they need arent on the block they say