Introducing..Summit Pro LS Forged Pistons!!!!!
On The Tree
Joined: Mar 2013
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From: Puerto Rico
As it sits, a .041 gasket would net .046 quench which is decent. Compression is up at 11.9:1 which is pretty stout. A .051 gasket drops to 11.6:1, but the quench goes away. You could deck the block .011 with your present gaskets to hit .045 net. If you're feeling your oats you could deck it as much as .020 to set quench at .036...which is as tight as we recommend and would net 12.25:1.
What are you thinking about for fuel and how much cam do you have in it?
What are you thinking about for fuel and how much cam do you have in it?
Cam is a comp custom.
238-244, 605,612 -114 plus 1.8 roller rockers
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We think your best bet is to run the .041 gasket and .005 in the hole. You could cartridge roll around the edge of the dome and valve reliefs to smooth them and remove a bit of volume. Those are 3cc positive domes. For those that are curious, every 2.76 grams of 2618 material equals 1cc. Meaning if a piston started off at 452.76 grams and you widdled the domes down a bit and saw 450 grams, you will have removed 1cc of volume.
On The Tree
Joined: Mar 2013
Posts: 110
Likes: 14
From: Puerto Rico
We think your best bet is to run the .041 gasket and .005 in the hole. You could cartridge roll around the edge of the dome and valve reliefs to smooth them and remove a bit of volume. Those are 3cc positive domes. For those that are curious, every 2.76 grams of 2618 material equals 1cc. Meaning if a piston started off at 452.76 grams and you widdled the domes down a bit and saw 450 grams, you will have removed 1cc of volume.
Sum-ls6125927
Arp-2000-7/16
Rod bolt torque?
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We're working on that now. The best way to do it is Torque Angle. That's the way the rods are honed and the spec is 30 ft./lbs + 50 degrees. Stretch on that is .0051-.0055. The second best option is Torque. 82 Ft. lbs is the number that most closely matches the torque/angle spec.
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With the 383's 4" stroke, our 5.7L bore pistons come with either a 16cc dish or the 5cc spherical dish. For Naturally Aspirated or nitrous, the 5cc spherical would net 11.5:1 with a 60cc chamber and it's available in a .005 over (3.903 oversize) P/N is SUM-1109273903-5 for the pistons. Rods are SUM-LS6125927. Crank is SUM-180LS400024x for the 24X reluctor and SUM-180LS400058X if you had a later ECM for whatever reason. Let us know if that combination works for you. If not, we have all the good brands and will find a combination that works for you. Thanks!
Staging Lane
Joined: May 2019
Posts: 89
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From: Morristown TN
With the 383's 4" stroke, our 5.7L bore pistons come with either a 16cc dish or the 5cc spherical dish. For Naturally Aspirated or nitrous, the 5cc spherical would net 11.5:1 with a 60cc chamber and it's available in a .005 over (3.903 oversize) P/N is SUM-1109273903-5 for the pistons. Rods are SUM-LS6125927. Crank is SUM-180LS400024x for the 24X reluctor and SUM-180LS400058X if you had a later ECM for whatever reason. Let us know if that combination works for you. If not, we have all the good brands and will find a combination that works for you. Thanks!
sheesh lol I have gotten so many different answers to this now I dunno what to do. I have been told the 5cc with a 61cc head would give me 11.5:1 but a 60cc would make it higher. Then I have been told to use anywhere from a 6-8cc dish to get to 10.5-11:1 which would be optimal??? Now this says the 5cc with a 60 will give me 11.5:1.....Im lost st this point.
sheesh lol I have gotten so many different answers to this now I dunno what to do. I have been told the 5cc with a 61cc head would give me 11.5:1 but a 60cc would make it higher. Then I have been told to use anywhere from a 6-8cc dish to get to 10.5-11:1 which would be optimal??? Now this says the 5cc with a 60 will give me 11.5:1.....Im lost st this point.
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11.5:1 is a stout compression ratio but if you have a decent sized cam in it and a good chassis dyno tune, you'll be in good shape. To give you an example, a LS2 has a 10.9:1 compression ratio from the factory. Here's a link to our compression ratio calculator. Two things to know. Our compression ratios are figured at .045 piston to head clearance. This is gasket thickness minus the amount the piston sticks above the deck at tdc. Our pistons are .011 shorter than the factory which makes them zero at 9.235 deck height. This 9.235 number is .005 shorter than the 9.240 nominal number. LS decks can often be found as low as 9.230 and in many cases people will need to deck the blocks to square them up. This is the reason for our 9.235 target. This allows you to play with gasket thickness a bit if you want. By all means, don't worry about asking questions. That's what we are here for.
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It's pretty much whatever you want to make it. Our compression ratios are figured with .045 net piston to head clearance. For instance, and .051 gasket and +.006 positive deck. Depending on your block condition, you will find our pistons are zero at 9.235 which allows a thinner head gasket to make up. For instance .040 instead of .051 would get you right back at our rated compression if your block was true at 9.240.
On The Tree
Joined: Mar 2013
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From: Puerto Rico
https://ls1tech.com/forums/generatio...t-ecs-cam.html
My thread. I used summit LS1 pistons and rods. Great pictures.
My thread. I used summit LS1 pistons and rods. Great pictures.
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From: Ohio, Georgia, Nevada, Texas
https://ls1tech.com/forums/generatio...t-ecs-cam.html
My thread. I used summit LS1 pistons and rods. Great pictures.
My thread. I used summit LS1 pistons and rods. Great pictures.
Man it's like you guys knew I was looking to build an engine!! When I'm looking for a cam BOOM you guys coe out of the blue, and now this. im sold.
I want to build a good 1000hp...doesn't have to make 1000 but be able withstand up to about that, but it would be nice.
I already have a summit turbo stage 2 cam, I have some 317 heads and will be putting some pac 1219s with them, ls7 lifter, TSP pushrods, and for now I have a gt45 but I might get a bigger one or run twins later. litterally have everything other than a block unless I build on my 5.7. But I'm not sure if thats recommended. if it is then I'll build that thing, but id rather build an engine k the side and then stick in when the stock 5.7 finally gives up.
which summit pistons, rods, rings, and possiblyly crank would you recommend for either a 5.3 or a 6.0 if 9 can find one for an fbody?
I want to build a good 1000hp...doesn't have to make 1000 but be able withstand up to about that, but it would be nice.
I already have a summit turbo stage 2 cam, I have some 317 heads and will be putting some pac 1219s with them, ls7 lifter, TSP pushrods, and for now I have a gt45 but I might get a bigger one or run twins later. litterally have everything other than a block unless I build on my 5.7. But I'm not sure if thats recommended. if it is then I'll build that thing, but id rather build an engine k the side and then stick in when the stock 5.7 finally gives up.
which summit pistons, rods, rings, and possiblyly crank would you recommend for either a 5.3 or a 6.0 if 9 can find one for an fbody?
It pretty much comes down to what i can get my hands on i guess. 5.3L seems to be a lot easier to get a hold of, but id love to build a 6.0L. Im just wondering if i forge my internals of my 5.7L (98 LS1) with a crank, pistons, and rods would it get me there.
Like I said, it doesnt have to be the mythical 1000hp number, but id like it to last awhile if i put this kind of money into the rotating assembly. Im just not sure which part number with summit i should use as theres several rotating kits for 5.3, 5.7, and 6.0 with different comoression ratios. Id imagine id be better with lower compression, but if i use the 317 heads, this might be too low and will either need to get some 241 heads or something simular as my 98 stock heads dont accept the ls9 gaskets i have on standby or get pistons that are domed to raise the compression ratio some.
Like I said, it doesnt have to be the mythical 1000hp number, but id like it to last awhile if i put this kind of money into the rotating assembly. Im just not sure which part number with summit i should use as theres several rotating kits for 5.3, 5.7, and 6.0 with different comoression ratios. Id imagine id be better with lower compression, but if i use the 317 heads, this might be too low and will either need to get some 241 heads or something simular as my 98 stock heads dont accept the ls9 gaskets i have on standby or get pistons that are domed to raise the compression ratio some.
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Thanks for checking in JoshuaGrooms83. Glad to hear our Pro LS line is offering parts that suit your needs at a competitive price.
We agree with G that an iron 6.0 is the best way to go here. The Pro LS rotating kits are up to the task for boost. They come with 2618 forged pistons, 4340 forged H-beam rods, 4340 forged crank, and a premium set of rings. For boost, we'd recommend the 12cc dished pistons. At the stock bore size, you would need SUM-R243600012. For .005" over you'd need SUM-R243600512. You would be at 9.1:1 with the 317 heads and stock gasket thickness of .053".
If you went the 5.3 route you could go with the 7cc dish pistons. Stock bore would be SUM-R24367807. .005" over you would need SUM-R24367857. With either of these, you'd have 8.7:1 compression. You could also go with the 2cc domes and be at 9.6:1 with the 317 heads. Stock bore is SUM-R24367802and .005" over is SUM-R24367852. You would still be plenty boost friendly at 9.6:1.
As for the 5.7 LS1 it's least desirable of the three for high boost applications. Especially with the 1,000 hp target. It's already in your possession so it's an option. We have a 7cc dish piston for the 5.7. Stock bore would be SUM-R2436L8987and .005" over would be SUM-R2436L9037. You would be at 9.2:1 with either of these options and the 317 heads.
We're comfortable with any of our Pro LS rotating kits to 1,000 whp out of the box. We'd recommend the 6.0 or 5.3 route for your power goals. There's plenty of both of them out there. In the end, it's up to you and what you feel is the best route for you.
We agree with G that an iron 6.0 is the best way to go here. The Pro LS rotating kits are up to the task for boost. They come with 2618 forged pistons, 4340 forged H-beam rods, 4340 forged crank, and a premium set of rings. For boost, we'd recommend the 12cc dished pistons. At the stock bore size, you would need SUM-R243600012. For .005" over you'd need SUM-R243600512. You would be at 9.1:1 with the 317 heads and stock gasket thickness of .053".
If you went the 5.3 route you could go with the 7cc dish pistons. Stock bore would be SUM-R24367807. .005" over you would need SUM-R24367857. With either of these, you'd have 8.7:1 compression. You could also go with the 2cc domes and be at 9.6:1 with the 317 heads. Stock bore is SUM-R24367802and .005" over is SUM-R24367852. You would still be plenty boost friendly at 9.6:1.
As for the 5.7 LS1 it's least desirable of the three for high boost applications. Especially with the 1,000 hp target. It's already in your possession so it's an option. We have a 7cc dish piston for the 5.7. Stock bore would be SUM-R2436L8987and .005" over would be SUM-R2436L9037. You would be at 9.2:1 with either of these options and the 317 heads.
We're comfortable with any of our Pro LS rotating kits to 1,000 whp out of the box. We'd recommend the 6.0 or 5.3 route for your power goals. There's plenty of both of them out there. In the end, it's up to you and what you feel is the best route for you.
Awesome! Thank you much! I especially appreciate the stock and modified applications! I have a plan now. pretty much dictated by which engine I can get my hands by me. 5.3L seem to be a lot more plentiful over 6.0L, but every so often one pops up. I might hold on to the 5.7 for something else later.
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No problem JoshuaGrooms83! Glad that we could help you get a better idea of the direction for the build. That sounds like a pretty solid plan. Nothing wrong with holding onto the LS1 for a future build.