Summit Racing 6.0 LS Block
Teching In
Joined: Oct 2013
Posts: 42
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The bore distorts and is out of round.The torque plate simulates the force applied by torquing the bolts/studs just as they would be installed with the head on. Then the machine work has been done in a similar environment as the engine will be when assembled and running. The bore usually moves a couple thou. How much and where depends on a lot of factors. Most LS engines are not torque plate honed from the factory as this drives up thecost. There's an old video showing the LS7's assembly and there are many videos to show this.
Teching In
Joined: Oct 2013
Posts: 42
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O.K. guys very good info...appreciate replies.
so if the summit block is finished honed smaller than the size needed for 30 over pistons and they say they used a torque plate...if I have a shop size the pistons to bore do they need to use a torque plate? Hard to find machine shops in upstate ny with good equipment.
so if the summit block is finished honed smaller than the size needed for 30 over pistons and they say they used a torque plate...if I have a shop size the pistons to bore do they need to use a torque plate? Hard to find machine shops in upstate ny with good equipment.
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Yep, if you dont check the bore with a torque plate installed your engine is doomed. The rings will never seal and will use like a gallon of oil per tank of fuel. Trust me guys, I read it on the internet.
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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.
At one point in time the part number on the summit sight was ATK. Whether or not ATK supplies these blocks to Summit for re-sell is a question best asked to them. I can tell you this. I purchased a bare block directly from ATK. I did not need to have a machine shop bore the cylinders as they were already finished and perfect match up to my Diamond pistons. I don't have the numbers in front of me as I built the block earlier this year but the piston to wall clearance all feel within Dimaonds recommended specs. Engine runs great. No piston slap at all. I couldn't be happier to be honest.
If ATK doesn't provide the blocks to Summit then I can't speak in terms of the blocks Summit sells. But I can speak in regards to ATK themselves and I was very happy with the bare block I ordered from them.
If ATK doesn't provide the blocks to Summit then I can't speak in terms of the blocks Summit sells. But I can speak in regards to ATK themselves and I was very happy with the bare block I ordered from them.
Teching In
Joined: Oct 2013
Posts: 42
Likes: 0
Looks like my first take measurements were way off. Don't know if it was due to a cold room vs a hot one or tool calibration was off....but now getting readings around 4.0295 plus or minus .0005
Main thing my machine shop said was they were not honed with a Trq Plate so when he checked it it was WAYY out of whack.... Basically making the block useless...... Complete waste of money for me... Ill never buy another.
TECH Fanatic
Joined: Aug 2011
Posts: 1,324
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From: Marengo, Ia
Our block is going to be machined using a deck plate system and the cylinders will be finish honed using the following equipment: Sunnen CK-21 or Sunnen CV-606 Ra spec max 30 after hone, max 25 after brushing. New Durabond Cam bearings and a new steel freeze plug are installed by our supplier.
Last edited by Fry_; Sep 3, 2014 at 01:17 PM. Reason: spelling
I think your machine shop is either misinformed of just full of s#!+.
I kind of doubt Summit is going to come in hear and try to tell lies the us knowing how experienced and informed some of the members here are. It also sounds like if you find something wrong with the block all you have to do is call Summit and they'll work with you to make it right.
I think your machine shop is either misinformed of just full of s#!+.
I kind of doubt Summit is going to come in hear and try to tell lies the us knowing how experienced and informed some of the members here are. It also sounds like if you find something wrong with the block all you have to do is call Summit and they'll work with you to make it right.
I kind of doubt Summit is going to come in hear and try to tell lies the us knowing how experienced and informed some of the members here are. It also sounds like if you find something wrong with the block all you have to do is call Summit and they'll work with you to make it right.
I can confirm what Fran said. I had a 6.0 from summit bores were perfect without torque plates and slightly off with torque plates, other than that 300 gallons of cosmoline that it was sprayed with (so heavy I had to ball hone the bores).
Registered User
Joined: Aug 2014
Posts: 23
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When your machine shop machines other iron LS blocks does the deck surface clean up with a minimum cut? Is your machine shop finding that the iron LS blocks require very little material removed? Is your machine shop finding that most of the used blocks are in very good condition, or are they finding a large number of blocks that are unusable for racing?