BlindSpot

Please do. I want to just stare at it for a while!

Da Z06

PSI1516LS is one badass spring.

Apocolipse

ooooooo

Did not know about these. Will dyno with the 1511 then swap to the 1516 and see if there is any change 6500+

Thank you

ls404fd

Are you hydraulic or solid roller? The 1511 is pretty light per the spec sheet.

Apocolipse

Hydraulic - johnson 2116 and Ti retainers on OE Ti intakes and hollow exh. Seems to rev to 7k+ no problem but never been on a dyno.

FNBADAZ06

I used the 1511's with the Katech Torquer 110 and K501, which I revved to 7300

ls404fd

You could move to a dual spring like the 1206x but you're also adding more weight to the spring by doing so. If it ain't broke (or breaking) I wouldn't mess with it. The johnson lifters would take the stiffer PSI beehive if you want to give that a try too.

I'm building a pretty aggressive solid roller build with ~.715" lift and am planning to use the PAC 1208x with plans to rev it up to 7800-8000 rpm. I may step that down to the 1207x if PAC thinks I can get away with it. They list max lift at .700, but I know people are going beyond that - and the coil bind specs appear to be just fine. Worst case with an LS7 I can go a little taller on the installed height to sneak out .020" more lift.

FNBADAZ06

Looks like at minimum Comp 7228-16 conicals would fit the OEM LS7 heads....not sure about the other two listed here on Comp's site.
The conical they are discussing on running on mine are not listed yet and are too big for standard LS7 heads.



For comparison sake, here's PSI's 1500 Series catalog....

Apocolipse

Thank you very much for the comp comparisson - certainly not worth the $ to take the heads off to be machined at this point so I am glad there are a few options outside of the duals. The basic comp is between the 1511 and 1516 as far as seat pressure goes but open is closer to the 1516. Only issue I see is coil bind from 1.8" is after 0.675" lift - I am 0.650" intake. How close are you going to run yours to cb or is that HPR secret material

FNBADAZ06

Erik and Billy (Godbold) are discussing cam and spring selection now, and have been bouncing ideas off each other. I don't think it will be any secret and I would certainly share the final configuration once it's been defined and tested if it's an off the shelf solution.

Apocolipse

Well if you end up going to cammotion for lobes it would make it easier on people like me haha

FNBADAZ06

I've watched and learned a bit with what Billy Godbold has been doing over at Comp Cams, and it is truly cutting edge stuff....he lives and breathes valve train dynamics and engineering, and is an educated nuclear physicist turned hot rodder
The Cam will ultimately come from Comp, with whatever lobe design they engineer/test to compliment my particular setup....no sense in trying to out smart a "rocket" scientist
Comp has three Spintron test rigs at their disposal, and if you subscribe to articles published in EngineLabs, EngineBuilders, HotRod Network, etc. you can read about what Billy has been doing, along with the testing and results.
Here's one about the Micro Surface Enhancement (MSE) finish which Comp (Billy) developed and tested....

https://www.enginelabs.com/engine-te...e-enhancement/

0HP RESEARCH

Not sure how I missed your build thread but I'll try and chime in a bit more!

Apocolipse

please do

FNBADAZ06

You've got a lot of engines moving thru the shop...... too busy to be looking for build threads

0HP RESEARCH

Well to touch pretty quickly on the new conical springs. There are more and more coming out there now and we might have found a conical to work with the higher lift setups, but it would have to be in an aftermarket head as they are to large to fit within the OE spring pockets. They do look to fit ok in the Brodix and TFS heads ok for sure, but still working on the details.

Now the big dual conical that Victor posted above, yeah that one is a big boy and would have to have the head cut for it, and also plan on running a lot of lift...and more than likely a solid roller just due to the pressures at setup with those. It is nice having a lot more options with springs now, just takes a bit more time to nail them all down.

The 7228 is more for the LS1/2/3 heads while the 7230 is what we have been using on most of the LS7 headed builds. They are tight getting in there on all of them so you do need to measure and make sure you have options for shims, locks, and retainer heights to get install where you need to be.

Da Z06

To clarify, will the 7230 will fit a LS7 spring pocket?

Da Z06

I rant the PSI 1516 to 7500 RPMs however my set-up was pretty light:

PSI LS1516ML springs
BTR TI-Retainers
Stock Locks
Stock Ti-Valves (intake)
COPO LS7 Hollow Stems Valves (exhaust)
Stock Rockers with Straub Bronze Bushings

So far weight comparison (based on my own scale) it looks like when compared to the PSI 1515 spring and Ferrera F2042P hollow stem.

Old Set-up (stock locks/retainer/intake valve/PSI 1515ML/Ferrera F2042P HS):

Intake: 164g (vs 179g stock)
Exhaust: 174g (vs 177g stock)

PSI 1516 spring, Ti retainer, COPO exahust:

Intake side weight: 149g (vs 179g stock)
Exhaust side weight: 147g (177g stock)

That is a 30g weight reduction or 16.75% on the intake and 30g or 16.94% on the exhaust over stock which was very significant.

0HP RESEARCH

Yes, the 7230 will work on the OE LS7 or aftermarket LS7 heads that we have used.

ls404fd

I like the conical springs, and Comp is obviously very proud of them, but the max lift is depressing. .715" to coil bind from a 1.900" installed height

I guess it works well for most hydraulic setups out there, but I need something that will work on a stock ls7 head to ~ .725" lift on a low shock solid roller lobe.