Lm7?

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Jan 19, 2007 | 06:54 PM

86SWB

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Staging Lane

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From: Walker, LA

Lm7?

What is the LM7? Is it just the plain old 5.3? What is the code for the aluminum blocked 5.3?

Jan 19, 2007 | 06:59 PM

Mangled03gmc

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From: In a van DOWN BY THE RIVER

Lm7 is the iron block alum head engine, the L33 is the new all aluminum head, block engine, has a lil bit higher comp..

Jan 19, 2007 | 07:21 PM

alanderson1978

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From: Blytheville, AR

L33 also is a Flex fuel vehicle. I think it's rated about 10 hp higher.

Jan 19, 2007 | 07:55 PM

trever1t

2nd fastest 5.3 ECSB

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From: NorCal

L33 is not flex fuel. Different code for the flex. L33 is 310fwhp stock. Different heads,cam, pistons.

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