Pictures of the GMPP LSX Block
Thread Starter
LS1Tech Sponsor
Joined: Feb 2006
Posts: 1,170
Likes: 1
From: Rockfield Kentucky
Originally Posted by WILWAXU
Hehe yeah, Tony and I were telling the GM guys that we need one with a Pontiac symbol and blue powdercoat 
A LSx 455 Pontiac
Thanks!
Done
A LSx 455 Pontiac
Thanks!
Done
Yeah yeah yeah, but then we would have to add another 50 to 75 pounds to the casting
It was good to meet you guys.
Robin
Staging Lane
Joined: Aug 2006
Posts: 91
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From: under the hood
When I was talking to the guys at the GM booth, they mentioned the iron alloy was about 15% stronger than production.... they weren't sure on the exact composition or additional chemicals, just that it was 15% stronger than production iron. They mentioned that the block was designed from the computer model that the LS7 was made from, adding in thier specific changes, which is why the LS2/LS7 front cover and knock sensors are required.
They had one of these blocks in a car they built for Reggie Jackson and said it was 454 cid...... 4.185 bore and 4.125 stroke. When I asked, they eluded the question if it was going to be a crate engine soon... they're waiting on heads.
All I have to say is that this thing was bitchin' in person..... can't wait to get one and push it.
They had one of these blocks in a car they built for Reggie Jackson and said it was 454 cid...... 4.185 bore and 4.125 stroke. When I asked, they eluded the question if it was going to be a crate engine soon... they're waiting on heads.
All I have to say is that this thing was bitchin' in person..... can't wait to get one and push it.
Staging Lane
Joined: Aug 2006
Posts: 91
Likes: 0
From: under the hood
Originally Posted by Billiumss
If the bore spacing is the same as a regular LS1, how is this block that much different than a stock LQ9 iron block? Why wouldn't we be able to bore out a LQ9 block the same as this new GMPP LSx block (up to 4.250)? Please explain and be technical.
Bill
Bill
Small block Chevy's have a 4.40" bore spacing, so you are limited to how big of a bore you can put in them. The stock GM iron blocks like the LQ9 have water jacketing between the bores. When there's water jacketing between the bores, you can only bore so large and you'll hit water. Generally, in stock form they design the bore wall thickness for the stock bore, with a given wall thickness.... let's say about .100" (varies by block).
Old School GM Bowtie blocks, along with the aftermarket blocks are solid between the bores, this is known as siamese bores. When they're siamese, the metal between the bores get's thin as you bore it out, but it's the thrust you need to be concerned with. When you bore the block to larger sizes like GM's claiming with the LSX, you usually get thin in the thrust areas of the bores, this is the 12 o'clock and 6 o'clock positions.... this is where the pistons try to force themselves thru the block. As the power level of the engine increases, wall thickness becomes more of a factor. They were claiming at the SEMA show that the wall thickness is .200" when fully bored out to 4.250"
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Originally Posted by Sparetire
"Holy huge billet mains and cylinder wall thickness Batman!"
"Correct Robin, we'll open some serious whup-*** on those dastardly tools."
"Correct Robin, we'll open some serious whup-*** on those dastardly tools."
TECH Regular
Joined: Jul 2005
Posts: 423
Likes: 0
From: Lombard,IL
so why would u not be able to run boost on this block? if it is capable of 2,500hp, i dont think many people are gonna be hittin that mark with just heads cam and ALOT of nitrous. im not sayin people are gonna am for 2,500hp, im just sayin in general u can make alot more power with boost. i havent any answers to this as of why u cant so if somone who was at sema or if robin can chime in that would awesome. thanks again guys. this block is def gonna change the world of GM performance.
FormerVendor
Joined: Dec 2005
Posts: 250
Likes: 1
Originally Posted by Phoenix 5.7
u can run boost on this block. thats basically the whole point of the 2 extra head bolts per cylinder, to keep the heads from lifting under extreme boost
I can't see how adding 2 bolts perpendicular to the crank will stop the leakage between cylinders or at the ends where the main water passages between the head and block are. If the thin cast head is flexing between the bolt span, then this is no help in those areas. That makes the .150" (4.250 bore) between cylinders seam that much more unreasonable, besides the cast irons strength issue. A .130-.140" wide section of gasket on a Siamese bore without cooling will make a nice glow plug and have very little strength even in stainless at the elevated temperatures. Even worse a MLS gasket for aluminum heads has 2 outer layers approx. .010" thick X .130"
Maybe a heavy cast iron head is in the works to go with it.
Has anyone flow benched any heads to see how the bolt and plug in the intake port will affect the flow ?
2500 HP, but comes with 10mm head and main bolts ?
It does not have a hole in the intake port by design, although the Merlin does. This would be like a Big Chief type head when you add the extra under bolts. The valley has four access windows to install and tighten the hardware from underneath the deck surface pulling down on the head. The head would have 4 threaded holes.
This is the best part I have seen so far, not sure about 2500hp, but this is the one I would use to try!
Kurt
This is the best part I have seen so far, not sure about 2500hp, but this is the one I would use to try!
Kurt
Banned - Ed Curtis aka EDC
Joined: Aug 2006
Posts: 100
Likes: 1
Originally Posted by Quick Carl
If the thin cast head is flexing between the bolt span, then this is no help in those areas. That makes the .150" (4.250 bore) between cylinders seam that much more unreasonable, besides the cast irons strength issue. A .130-.140" wide section of gasket on a Siamese bore without cooling will make a nice glow plug and have very little strength even in stainless at the elevated temperatures.
FormerVendor
Joined: Dec 2005
Posts: 250
Likes: 1
"Small block Fords have a 4.380" bore spacing and only ten head bolts. Even with 4.125"+ bore sizes, the DART blocks are handling over 2000 HP with superchargers or turbos."
My point exactly! We are building engines all the time with much higher cylinder pressures that seal with "4 bolt" heads. Some use 11-12mm head bolts.
My point exactly! We are building engines all the time with much higher cylinder pressures that seal with "4 bolt" heads. Some use 11-12mm head bolts.
Last edited by Quick Carl; Nov 17, 2006 at 10:48 AM.
Originally Posted by Nine Ball
Yes, it will only come in orange. It is powdercoated though, looks nice in person, and won't chip like paint.
I asked the GMPP guys to offer it in Pontiac blue also
I asked the GMPP guys to offer it in Pontiac blue also