Engine similarities?

JOSELCANTU

MEMBER
2009 CHEVROLET SILVERADO
5.3L
V8
2WD
AUTOMATIC
180,547 MILES

I’ve watched your amazing 5.3 ls Lm7 breakdown playlist, and my question is since my engine is the LC9 that comes from the gmt900. Can I use all those exact parts you received from summit racing or is there some small adjustments or tips I need to look out for to do a build just like yours.

Wednesday, January 28th, 2026 AT 10:35 PM

2 Replies

STEVE W.

MECHANIC
15,546 POSTS

They are somewhat similar but they are different generations. The 5.3 in the videos is the later 3rd generation engine while yours is a 4th generation engines. There were a number of changes made in the gen 4 engines like displacement on demand and internal changes in the cam and lifters as a result. There are parts available for them to build some extra power though they are not the same as the LM parts.

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Thursday, January 29th, 2026 AT 9:46 PM

RYAN L

ADMIN
275 POSTS

Thank you for watching the series!

There is a ton of crossover on parts but before you order anything just check with Summit if it fits your engine. They have a really good fit checker on every single parts page.

Best,
Ryan

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Friday, January 30th, 2026 AT 2:51 PM