Summit Brand LS Blocks ?

[Che70velle]

The web site says that it has finished cylinder bores.

[Musclerodz]

Originally Posted by Che70velle

The web site says that it has finished cylinder bores.

but when you read dimensions, they are undersized unless they changed it again

[LS3torque]

My Summit description says "Factory Overstock" which I believe was an over-run of GM parts and bore is Finished 3.780 which is 4.8 or 5.3 liter finished bore size depending on which crank you drop in it. Woops the Summit on line description says "Summit brand block" but finished bore "yes"

[travmon]

I guess I can order one and see what it is when I get it. I am however very curious as to the origin of this particular block, it is not a motor that has a huge high performance(build platform) following nor do I see it being a huge replacement block market for standard repairs.( most are still running ) It would be easier for me to believe they bought a bunch of overstock ( phased out of inventory) blocks from GM..I cant see anyone tooling up to make an aftermarket iron block that had no improvements or raised deck height that didn't have a huge standard replacement need for daily drivers ? STRANGE...
I will check with some friends that own machine shops and see how many LS motors they are doing standard rebuilds on.. These days the motors outlive the vehicle...

[JsTA]

I wonder if these are from ATK? Summit sells a 6.0 LQ4/9 block that is .030" over and supposedly finish machined that they get straight from ATK. Those blocks are seasong (used) blocks that have been cleaned and bored.

Here is the listing for the 6.0 block:

http://www.summitracing.com/parts/SUM-150105/

Here is a thread on ls1tech detailing the 6.0 block:

http://ls1tech.com/forums/generation...-ls-block.html

There were som naysayers in that thread but overall it seemed like most were pleased.

[Musclerodz]

Originally Posted by JsTA

I wonder if these are from ATK? Summit sells a 6.0 LQ4/9 block that is .030" over and supposedly finish machined that they get straight from ATK. Those blocks are seasong (used) blocks that have been cleaned and bored.

Here is the listing for the 6.0 block:

http://www.summitracing.com/parts/SUM-150105/

Here is a thread on ls1tech detailing the 6.0 block:

http://ls1tech.com/forums/generation...-ls-block.html

There were som naysayers in that thread but overall it seemed like most were pleased.

Look at the estimated ship date.....

[JsTA]

Originally Posted by Musclerodz

Look at the estimated ship date.....

Which is weird because their shortblock based off the same block is supposedly going to ship 02Feb..

http://www.summitracing.com/parts/hpe-sp19/overview/

But really though I was just comparing the two thinking maybe they were from the same company.

[LS3torque]

Originally Posted by travmon

I guess I can order one and see what it is when I get it. I am however very curious as to the origin of this particular block, it is not a motor that has a huge high performance(build platform) following nor do I see it being a huge replacement block market for standard repairs.( most are still running ) It would be easier for me to believe they bought a bunch of overstock ( phased out of inventory) blocks from GM..I cant see anyone tooling up to make an aftermarket iron block that had no improvements or raised deck height that didn't have a huge standard replacement need for daily drivers ? STRANGE...
I will check with some friends that own machine shops and see how many LS motors they are doing standard rebuilds on.. These days the motors outlive the vehicle...

Yup that's exactly what I was thinking...

[Che70velle]

Originally Posted by travmon

I guess I can order one and see what it is when I get it. I am however very curious as to the origin of this particular block, it is not a motor that has a huge high performance(build platform) following nor do I see it being a huge replacement block market for standard repairs.( most are still running ) It would be easier for me to believe they bought a bunch of overstock ( phased out of inventory) blocks from GM..I cant see anyone tooling up to make an aftermarket iron block that had no improvements or raised deck height that didn't have a huge standard replacement need for daily drivers ? STRANGE...
I will check with some friends that own machine shops and see how many LS motors they are doing standard rebuilds on.. These days the motors outlive the vehicle...

After thinking about this, your probably right about these simply being over stocked blocks. The LS series is done, and GM has moved on to producing the new LT stuff, so it makes sense.

[travmon]

Should I buy them all so they can be auctioned off in 50 years by my children for big money !! you know for the guy that is restoring his silverado and needs a numbers matching block, lol .