booz

I'm running 93 octane. Also my new head gaskets are the straub ones that come with extra cooling holes for reducing detonation.

Cam is a comp custom.
238-244, 605,612 -114 plus 1.8 roller rockers

Summitracing

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.

booz

What is the rod bolt torque values for my rods. They came without any paper.

Sum-ls6125927

Arp-2000-7/16

Rod bolt torque?

Summitracing

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.

Daniel Kinsler

So if I wanted a 383 LS1 using my 60cc PRC 225 heads I would need the 7cc dished pistons with the 4.000 crank and 6.125 rods?

Summitracing

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!

Daniel Kinsler

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.

KCS

iTrader: (20)

Its not rocket science. I like the Wallace Racing calculator to figure out the compression ratio. Summit also has one on their site as well.

Daniel Kinsler

Lol it is for me! Im new to this much thought on it.

Summitracing

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.

Daniel Kinsler

What is the deck clearance value for the calculator??

Summitracing

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.

booz

https://ls1tech.com/forums/generatio...t-ecs-cam.html

My thread. I used summit LS1 pistons and rods. Great pictures.

Summitracing

Thanks for choosing Summit Pro LS pistons and rods to be a part of your build. We made a post on your build thread.

JoshuaGrooms83

iTrader: (2)

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?

G Atsma

I would find an iron block 6.0 like an LQ4 or 9. For 1k HP you want the durability.

JoshuaGrooms83

iTrader: (2)

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.

Summitracing

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.

JoshuaGrooms83

iTrader: (2)

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.

Summitracing

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.