InfamousRacing

Hello!

Trying to figure out some good options for a cam in an LY6. I ordered a VVT delete kit. I was looking at the popular Sloppy Stage 2. The engine is going in a 05 RCSB Colorado with a 4l80e. Plan is a streetable truck that will see the track. Good chance for boost in the future, but not for the first year. Any suggestions? What's a good spring kit to go along with it. Thanks.

Summitracing

What are you plans for a converter?

InfamousRacing

That's still up in the air, I'm open to suggestions.

Summitracing

Our Pro LS stage 2 turbo cam p/n SUM-8706 is a new and improved version of the Sloppy stage 2. The valve events are similar, but the lobes are Much better. Grind quality is outstanding and we've priced it right inline with the Sloppy 2.

We designed it with a bit more lift at .600/.575 lift to work with today's common, affordable and quality .600 spring packs like the TFS-2500286 or 287. We can't talk specs now, but look for an announcement on or before Oct. 10 and we'll have another option for you that may be even more suitable.

153624-rudolf

I recently installed the sum-8712 in my 4.8. I'm very happy with it. Noticable gains, sounds great, easy to tune, and drives smooth.

Summitracing

It's a really great cam and we're happy that you're happy. That's exactly what that cam is supposed to do.

InfamousRacing

How will the 8706 do in a N/A configuration? What lift are the TFS-2500286 rated to? What do you recommend for lifters? What stall would be best for this cam in a N/A set up? I'm waiting for your October 10th announcement.

153624-rudolf

I've cammed plenty of LS motors and they respond well to cam changes. I'll say for this being a stage one out whatever it is I'm just flat impressed . This cam sounds amazing and I get compliments all the time. No drivability was given up for it either. It just drivers like stock with a ton of low end while sounding amazing. I can finally pull my camper above 60 miles per hour and it doesn't down shift to second gear anymore on the slightest grade. All this and I'm still getting 18.8 MPG empty .



Good job on this grind!!!

Summitracing

Interestingly, turbo cams and truck cams share some of the same characteristics- but for different reasons. SUM-8706 would be a good naturally aspirated truck cam as long as you're running a 2800+ converter. If you advanced it just 1 degree, it would match the intake events of our SUM-8714 Stage 4 truck cam and each of the exhaust opening/closing events would be 2 degrees earlier (not a lot of consequence there). You're gaining another .055 worth of lift though so you'll have comparable numbers power wise. With a decent converter, you'll have a mean machine. You could install it straight up and smooth the idle a bit. If that's still just one step bigger than what you intended, I think you'll like our next announcement.

TFS-2500286 springs are Pacaloy Dual with 160 @ 1.800 installed heigh, 395 @ .600 lift, 405 @ .625, max lift of .660 in (coil bind at 1.050). Open pressure isn't so high that it's going to wear out parts, but it has the seat pressure to do the job as you progress.

As for lifters, everyone loves our LS7 spec lifters. P/N for lifter/trays/bolts is SUM-HTLSKIT

InfamousRacing

Perfect. Basically my goal is to get a cam in their that will make "big" power for a stock N/A pump gas engine, but something that will work well for boost in the future. The truck won't be pulling trailers or anything like that and in stock configuration weighs 3100 lbs, I just plan to drive it on the street occasionally, not a daily driver. This cam and spring set sounds like a good option for me. I plan to keep the compression stock for the time being as well. What do you recommend for a valve compressor tool? Will that combination work with the stock rockers and push rods as well? I'll start looking into converters as well. I don't think it's too big like you're wondering but this is my first venture into the LS type engines so I'm still learning. Thanks for the help thus far.

Summitracing

Yes, that sounds like this cam will make you happy. The TFS-90307 is the best compressor for a rectangle port. We are a fan of the stock rockers with trunnion kits. We have the bushing style trunnions part number SME-K-141560 and installation tool SME-906011. These are 3 bolt cams, so you'll need the NAL-12586481 3 bolt / 4 pole upper timing gear. The wedge style dampers are a good idea vs. the tensioners used in most of the later vehicles...p/n TFS30675540. You'll need a new set of valveseals p/n TFS-30600455, SUM-910211 2004+ head bolts, We also have a cam change kit that includes front gaskets, seal, oil pump o-rings, water pump gaskets, balancer bolt, valve cover gaskets, and ls2 chain p/n CMB-09-0028. Exhaust gaskets CMB-05-0151 (these come with stage 8 locking bolts which will come in handy with your turbo down the line). A set of LS9 head gaskets might save you some hassle later down the line...p/n NAL-12622033 (x2). It's a matter of personal preference, but a lot of folks buy new front covers with the front main seal installed. It's a SUM-G6321. Lastly, a steam kit is a good idea at some point- TFS-306SB601.

You didn't mention the year of the LY6, but the 2007-08 injector p/n 12580681 were 30 lbs which are going to be marginal at as little as 400whp . The 09-10 injector p/n 12587269 were 40lb and support roughly 525whp. Let us know if you need anything else.

David@Vengeance

iTrader: (2)

For your application we would recommend a custom grind camshaft.

I have included a link to our custom cam form for your review.

https://vengeanceracing.net/1999-tra...rder-form.html

Let us know if there is anything else we can assist you with.