Hello all,

We hope you had a good Christmas! We are working to give you a Happy New Year as well! Our .550" lift SUM-174002 LS6 springs currently priced at $69.99 have been a success. As we've noted before, these inexpensive springs are some of the best horsepower per dollar components you can buy. We've seen 1,000 more useable rpm in many cases! With as many .600" and .625" lift cams as we have, we are introducing new drop-in .600" and .630" lift Beehive springs to match. Specs are as follows:

SUM-174002 (LS6 Springs currently priced at $69.99)
1.270" Diameter
1.800" Installed height at 90 lbs. seat pressure
1.250" Open height at 295 lbs. open pressure
375 lbs./in. Spring rate

SUM-174004 (Introductory pricing $158.99)
1.290" Diameter
1.800" Installed height at 130 lbs. seat pressure
1.200" Open height at 320 lbs. open pressure
310 lbs./in. Spring rate

SUM-174005 (Introductory pricing $169.99)
1.300" Diameter
1.800" Installed height at 140 lbs. seat pressure
1.170" Open height at 350 lbs. open pressure
340 lbs./in. Spring rate

In addition, we have added the SUM-174004 springs to most of the .600" lift cams that we offer as the -1 cam/spring/seal/lock kits we offer. At $429.99, it amounts to a 10% discount, and pricing on the website will be updated by the end of the week.
SUM-8703-1
SUM-8706-1
SUM-8707-1
SUM-8708-1
SUM-8715-1
SUM-8716-1
SUM-8720-1

While most prices are going up in 2022, we've made strides to push them down! We have more cool projects in the hopper for January. Be sure to keep an eye out!

 

Nice!

 

I think there has been some people somewhere quote a rough estimate on how much spring you can run and keep the stock GEN IV cam phaser stable. I would bet you probably wouldn't recommend any of the cams and try to keep VVT? Also I am sure anything stage 2 and above would probably be a no go with a stock VVT and no phase limiter just do to PTV alone? It would be nice to find something in this reasonable price point for my L9H (L92) 6.2 and be able to retain the VVT (I am weird and would like to play with the cam advance, especially at idle to see the effects, and I'm also weird in that I love stock stuff like stock exhaust), it would allow me to get something going while I wait around for my forced induction plan to come true. If I had to go to a custom cut cam I would be easily at $500 already before buying springs.

 

You bring up some great points jclark10.

Regarding spring pressure and keeping the stock VVT cam phaser happy. We like to keep open pressure under 400 lbs. when retaining VVT. This is where beehives become enticing depending on the cam manufactures spring requirements. We don't have any VVT cams in our Pro LS line. However, companies like Comp Cams and BTR offer VVT cams.

 

Thanks Summit, are you saying you don't have any "VVT" cams because you don't have any that were optimized or made from the beginning using VVT? Or is it because you can't verify PTV with any of the cams? I would think some of the smaller stage 1 stuff would be ok with the L9H, but I haven't experimented with one much. I would probably put in like a 10 degree or something limiter in anyway since the extra phasing beyond 10 degrees I think is just used for creating EGR effect for emissions and for sightly less pumping losses, at least I think.

 

We're saying that we don't have any in our line that was made for use with VVT. All of our Pro LS cams use a 3-bolt cam gear. You would need a 1-bolt VVT specific cam.

For example, look at the Comp Cams CCA-156-402-13 1-bolt VVT cam compared to our 3-bolt SUM-8720R1 cam.

 

Thanks, I was actually just looking at this and I figured this would be my only hurdle. The reason I wanted to use a Pro LS cam was due to the availability and I'm next to a Summit location as well, the price is a lot more reasonable, I don't feel any of the vendors advertising these cams as "VVT" cams actually optimized the cam valve events to take advantage of the cam phasing. That being said it looks like I will have to go with one of theirs anyway since its not feasible or economical to convert to a 1 bolt from a 3 bolt.

 

We're hijacking Summit's thread so probably start a new one if you want more input, but

VVT camshafts are typically more expensive, and only the parts needed to delete VVT and switch to 3 bolt can be much less. It's just that many delete kits include bolts, gaskets, and timing chains that you would want to replace while your in there. But you'd be buying them regardless of which type you use. And when buying a VVT cam, they typically require a phase-limiting device which adds to the cost of the camshaft swap. So it can still be a wash to even slightly cheaper to do the delete depending on whose cam/kit you're comparing hardware-wise. And while a properly designed and tuned VVT camshaft can provide more torque across the board; to do it properly requires someone who knows specifically how to optimize a VVT tune and additional dyno time, which will add to the tuning cost. I don't think the VVT has the failure rate like the AFM, but taking it out would also be one less system you have to worry about down the road.

 

Ok thanks for the info, and sorry didn't mean to hijack carry on. I kind of obsess over things that most others don't care about haha.