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Jaynu · 05-09-2025, 04:54 PM

New to this forum, looking for a little help. I am getting ready to purchase a LT4 long block from Chevy and I am looking for some details on two different part numbers.

First the GM#12700126 is listed as a 2016-21 Camaro LT4, then there is GM#12716403 is listed as a 2022-24 Camaro LT4. There is a significant price difference in the two. Does anyone know what the difference may be?

Was there possibly a change to the Cam phaser? And would that present any problem for a custom install using a terminator x to control the engine. This is the only clue of a difference i can find.

This engine is for an older restomod build so is not actually going in a Gen 6 Camaro. Any help would be greatly appreciated before I drop a lot of money on a motor.

Thanks

05-09-2025, 04:54 PM	#1
Jaynu Drives: 2013 CTS-V Wagon, 1936 Chevy Master Join Date: May 2025 Location: Jax Florida Posts: 2	LT4 Long Block Help New to this forum, looking for a little help. I am getting ready to purchase a LT4 long block from Chevy and I am looking for some details on two different part numbers. First the GM#12700126 is listed as a 2016-21 Camaro LT4, then there is GM#12716403 is listed as a 2022-24 Camaro LT4. There is a significant price difference in the two. Does anyone know what the difference may be? Was there possibly a change to the Cam phaser? And would that present any problem for a custom install using a terminator x to control the engine. This is the only clue of a difference i can find. This engine is for an older restomod build so is not actually going in a Gen 6 Camaro. Any help would be greatly appreciated before I drop a lot of money on a motor. Thanks Last edited by Jaynu; 05-09-2025 at 05:24 PM.