Gm discontinued L31 crate motors

98 Nitro · Feb 10, 2020

Well even when they are available if they are $2700+ when just last year they were $1800 I think I will just rebuild the original when the time comes probably with aftermarket vortec heads.

jaywestfall · Feb 10, 2020

Good to know. Thanks for sharing y'all. Definitely gonna need an engine replacement in the future....

stutaeng · Feb 10, 2020

Ok, so it looks like the "HD" was in the CK2500/3500 trucks, 2500/3500 G-Vans and 2500 SUVs and will still be available? The 4 bolt main is the most notable difference vs the 1500 models. Not sure if there are other differences. Both are "R" on the VIN.

If I recall on the JEGS website, they say the HD will not work with the 1500 models? Why would that be? Seems like externally they are identically. Even the gmperformancemotor.com website says "3/4 and 1-Ton only." Why? Is it just a labeling related to emission requirements or something like that?

Supercharged111 · Feb 10, 2020

stutaeng said:
Ok, so it looks like the "HD" was in the CK2500/3500 trucks, 2500/3500 G-Vans and 2500 SUVs and will still be available? The 4 bolt main is the most notable difference vs the 1500 models. Not sure if there are other differences. Both are "R" on the VIN.

The HD will work fine in a 1500. From the factory they got different exhaust valve seats and the 4 bolt mains.

If I recall on the JEGS website, they say the HD will not work with the 1500 models? Why would that be? Seems like externally they are identically. Even the gmperformancemotor.com website says "3/4 and 1-Ton only." Why?

L31MaxExpress · Feb 10, 2020

stutaeng said:
Ok, so it looks like the "HD" was in the CK2500/3500 trucks, 2500/3500 G-Vans and 2500 SUVs and will still be available? The 4 bolt main is the most notable difference vs the 1500 models. Not sure if there are other differences. Both are "R" on the VIN.

If I recall on the JEGS website, they say the HD will not work with the 1500 models? Why would that be? Seems like externally they are identically. Even the gmperformancemotor.com website says "3/4 and 1-Ton only." Why? Is it just a labeling related to emission requirements or something like that?

It has to do with the warranty. My 1/2 ton van had a 4-bolt main engine with a single roller timing chain and 906 heads with the "bad" exhaust seat as it was born. Its replacement was a 2-bolt. Did not find out it was an OE 4-bolt from the factory until I pulled the pan. I went ahead and just ran with it since it was the only way to get the GM warranty. If it weren't for the warranty the 4-bolt main engine is a better engine especially since it has the stronger roller chain.

Rick Reid · Feb 10, 2020

my truck has one of these in it, been 5 years but only have about 3000 miles on, runs great with an Edelbrock intake/card, MSD distrib, and 700R4

Gm discontinued L31 crate motors

98 Nitro

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jaywestfall

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stutaeng

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Supercharged111

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L31MaxExpress

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Rick Reid

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