Summit Racing 6.0 LS Block
Thread Starter
Staging Lane
Joined: May 2007
Posts: 53
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Summit Racing 6.0 LS Block Has anyone used one of the Summit Racing 6.0 Bare Blocks?
http://www.summitracing.com/parts/SUM-150105/
http://www.summitracing.com/parts/SUM-150105/
I considered using one when I built my 370. The machine shop advised against it stating they had cleaned up several. He also stated they do not use a torque plate when boring the cylinders. Take it for what it's worth I was not taking any chances.
Damn that sucks to hear. I'd love to be able to buy a machined block for a reasonable price so that I could drop a balanced rotating assembly into it as a cheap way of getting an assembled shortblock.
Thread Starter
Staging Lane
Joined: May 2007
Posts: 53
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Nothing against you but you will hear that from the majority of machine shops. All of their work is superior, and everybody else is shitty.
I might try the Summit block just to see if its bonafide. LKQ cores have been **** lately.
Cannot be any worse than some **** I have seen from some high dollar LSX speedshops.
I might try the Summit block just to see if its bonafide. LKQ cores have been **** lately.
Cannot be any worse than some **** I have seen from some high dollar LSX speedshops.
Teching In
Joined: Apr 2013
Posts: 43
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These are GM used cores re-machined. I can't comment if they use a torque plate but I trust Summit and a phone call to them will answer that.
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Maybe on a stock rebuild with stock pistons that have a larger window for piston to wall clearance, but not a performance build with better pistons that require a certain piston to wall clearance.
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This is exactly why I wouldn't trust one of these blocks for a performance build. If they sold the block with a rough bore and not a finish hone, it might be a good deal. But it's already finish honed to god knows what exact size. Which any good machinist will tell you, you cannot finish hone a block without the pistons present.
Maybe on a stock rebuild with stock pistons that have a larger window for piston to wall clearance, but not a performance build with better pistons that require a certain piston to wall clearance.
Maybe on a stock rebuild with stock pistons that have a larger window for piston to wall clearance, but not a performance build with better pistons that require a certain piston to wall clearance.
Not on a true performance build you can't. If I had bought this block and used it on my 370, I'd be tearing it back apart figuring out why the pistons don't fit correctly.
TECH Apprentice
Joined: Jun 2009
Posts: 318
Likes: 5
From: Oklahoma
ROSS, JE and I'm sure dimond, wiesco and any other piston manufacturer can will make a set of pistons for what ever you want.
As I posted earlier, my buddy runs a summit block, 408. Built to handle a bunch of nitrous. The engine runs fine. All the measurements came out correct.
"A true performance build". If you use a shelf piston and the clearence is to small then I'm sure a true machinest can hone it out a little more.
As I posted earlier, my buddy runs a summit block, 408. Built to handle a bunch of nitrous. The engine runs fine. All the measurements came out correct.
"A true performance build". If you use a shelf piston and the clearence is to small then I'm sure a true machinest can hone it out a little more.
ROSS, JE and I'm sure dimond, wiesco and any other piston manufacturer can will make a set of pistons for what ever you want.
As I posted earlier, my buddy runs a summit block, 408. Built to handle a bunch of nitrous. The engine runs fine. All the measurements came out correct.
"A true performance build". If you use a shelf piston and the clearence is to small then I'm sure a true machinest can hone it out a little more.
As I posted earlier, my buddy runs a summit block, 408. Built to handle a bunch of nitrous. The engine runs fine. All the measurements came out correct.
"A true performance build". If you use a shelf piston and the clearence is to small then I'm sure a true machinest can hone it out a little more.
TECH Apprentice
Joined: Jun 2009
Posts: 318
Likes: 5
From: Oklahoma
Don't be an idiot and buy a piston that's to big.
Get the block, measure the bore and "order from a company like Ross ,JE, and dimond the correct piston.
But a "true performance build" will take that into account and I'm sure a true machinst would know that.
Sure it's better (easier) to have the piston in front of the machinst but you don't have to. A competent engine builder will measure the bore and order a piston that is a perfect fit for the given application.
If its that big a deal, order the block with a rough bore and hope your local engine shop doesn't bucher it.
My Budy bought his finished. We measured and ordered the piston, pin and rings for his application.
Get the block, measure the bore and "order from a company like Ross ,JE, and dimond the correct piston.
But a "true performance build" will take that into account and I'm sure a true machinst would know that.
Sure it's better (easier) to have the piston in front of the machinst but you don't have to. A competent engine builder will measure the bore and order a piston that is a perfect fit for the given application.
If its that big a deal, order the block with a rough bore and hope your local engine shop doesn't bucher it.
My Budy bought his finished. We measured and ordered the piston, pin and rings for his application.
Don't be an idiot and buy a piston that's to big.
Get the block, measure the bore and "order from a company like Ross ,JE, and dimond the correct piston.
But a "true performance build" will take that into account and I'm sure a true machinst would know that.
Sure it's better (easier) to have the piston in front of the machinst but you don't have to. A competent engine builder will measure the bore and order a piston that is a perfect fit for the given application.
If its that big a deal, order the block with a rough bore and hope your local engine shop doesn't bucher it.
My Budy bought his finished. We measured and ordered the piston, pin and rings for his application.
Get the block, measure the bore and "order from a company like Ross ,JE, and dimond the correct piston.
But a "true performance build" will take that into account and I'm sure a true machinst would know that.
Sure it's better (easier) to have the piston in front of the machinst but you don't have to. A competent engine builder will measure the bore and order a piston that is a perfect fit for the given application.
If its that big a deal, order the block with a rough bore and hope your local engine shop doesn't bucher it.
My Budy bought his finished. We measured and ordered the piston, pin and rings for his application.
The right way to do it is measure each piston and size the bore around it.
If you search you will find some good info on this block. A reputable builder said the machine work and tolerances are very good. My only complaint is they don't use ARP main studs. It is common practice for an engine machinist to hone the bores to fit the pistons but modern machining tolerances show that you don't need to. Most parts made these days are held within a few tenths. How do you think all of these engines were put together.
TECH Apprentice
Joined: Oct 2007
Posts: 301
Likes: 20
With today's CNC machining processes on all the big players in the piston business, there's no reason to have the pistons in hand before honing the block. As long as you use good measuring equipment and cylinders are straight and round, piston manufacturers can hit any number you need. Cheaper to hone to a shelf size, though.
I am one of the old farts that can remember this being a MUST, though. The old TRW bricks we used to use on everything were sized and weighted all over the place.
Why would you "trust" Summit? I can call 4 times in a day and ask the same question to each tech and get a different answer every time. Find a builder you can TRUST and let him deal with it - that's why he's in the business.
I am one of the old farts that can remember this being a MUST, though. The old TRW bricks we used to use on everything were sized and weighted all over the place.
Why would you "trust" Summit? I can call 4 times in a day and ask the same question to each tech and get a different answer every time. Find a builder you can TRUST and let him deal with it - that's why he's in the business.
With today's CNC machining processes on all the big players in the piston business, there's no reason to have the pistons in hand before honing the block. As long as you use good measuring equipment and cylinders are straight and round, piston manufacturers can hit any number you need. Cheaper to hone to a shelf size, though.
I am one of the old farts that can remember this being a MUST, though. The old TRW bricks we used to use on everything were sized and weighted all over the place.
Why would you "trust" Summit? I can call 4 times in a day and ask the same question to each tech and get a different answer every time. Find a builder you can TRUST and let him deal with it - that's why he's in the business.
I am one of the old farts that can remember this being a MUST, though. The old TRW bricks we used to use on everything were sized and weighted all over the place.
Why would you "trust" Summit? I can call 4 times in a day and ask the same question to each tech and get a different answer every time. Find a builder you can TRUST and let him deal with it - that's why he's in the business.
And my original point was that. The point of the summit block is to avoid machine work...so if you have to touch it, aren't you just defeating the purpose of it?