BluePrint L31 Crate 350 (G3509602)

[DU-ROC]

I am planning to upgrade my 97 GMC Z71 from a 305 to a 350.

I am curious what others have experienced with the BluePrint’s part number G3509602 L31 350 crate (https://blueprintengines.com/collec...block-for-factory-efi-iron-heads-roller-cam-2)

The other option is the GM L31 replacement part number 12691673 (https://www.gmperformancemotor.com/parts/19432780.html).

I believe the GM L31 crate is now machined and assembled in the US. However, I cannot find any solid reviews aside from the older part number 12530282, which I believe was machined/assembled in Mexico and had reports of excessive oil consumption.

Those reports have pushed me to the side of the BluePrint but would like to know what others have experienced with BluePrint’s L31 replacement before making the purchase and spending a weekend doing the swap.

Thanks to all in advance.

 

[0xDEADBEEF]

You might as well go full send and get the 383. My $0.02 anyways.

 

[Moofus02]

Minor cost difference i would go 383

 

[99xcss4]

if you want a 350 I would get this https://www.gmperformancemotor.com/parts/19432779.html but if it was me and I was in your spot and if you have the money I would get this instead https://www.gmperformancemotor.com/parts/19433037.html

 

[DU-ROC]

You might as well go full send and get the 383. My $0.02 anyways.

Agreed cost is negligible but I believe the 383 has a 91 octane requirement which is not desirable as my daily driver.

 

[DU-ROC]

if you want a 350 I would get this https://www.gmperformancemotor.com/parts/19432779.html but if it was me and I was in your spot and if you have the money I would get this instead https://www.gmperformancemotor.com/parts/19433037.html

Agreed - I just question if the previous oil consumption issues GM had have been resolved with the manufacturing being moved to the US.

 

[PlayingWithTBI]

Agreed cost is negligible but I believe the 383 has a 91 octane requirement which is not desirable as my daily driver.

You can tune it for regular.

I just question if the previous oil consumption issues GM had have been resolved with the manufacturing being moved to the US.

My Blue Print 383 doesn't use any oil so far since the initial break in.

 

[jgreen16]

If wanting to stay with regular gas, maybe this would be the way to go. I'm considering it actually.

GM SB Compatible 350 c.i. Engine - 341 HP - Long Block

BluePrint Engines 350 c.i. small block GM style crate engine - dressed NEW BluePrint Cast Iron Longblock with carburetor. Includes 30 month / 50,000 warranty & BPE Dyno Promise. Part #: BP350CT

blueprintengines.com

 

[99xcss4]

If wanting to stay with regular gas, maybe this would be the way to go. I'm considering it actually.

GM SB Compatible 350 c.i. Engine - 341 HP - Long Block

BluePrint Engines 350 c.i. small block GM style crate engine - dressed NEW BluePrint Cast Iron Longblock with carburetor. Includes 30 month / 50,000 warranty & BPE Dyno Promise. Part #: BP350CT

blueprintengines.com

that look good but I do not think that will work for the op he needs a vortec

 

[99xcss4]

here is a blueprint 383 vortec meant for 96-00 https://blueprintengines.com/collec...tec-383ci-stroker-crate-engine-small-block-gm