When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
Would the 8719 give up more torque under 2500 vs the stock LM7 cam?
Comparing the 8719 to the stock LM7 cam. The 8719 would match or have slightly more torque under 2500. This is due to the increased lift of the 8719 to compensate for the later intake valve closing event.
Does Summit offer any cams for nitrous applications?
Yes, we offer cams that are for use with nitrous. Any of our Pro LS Automotive line of cams will work well with nitrous. Also, our stage 2 high lift or higher Pro LS Truck Cams work well with nitrous.
4.8 LR4 going into my 2wd K5. Truck already has a built 4L80E and 3000 billet converter. 7875 turbo, only looking to push to 10 psi. The truck previously had a 6.0, but my wife wants to start driving it, so it doesn't need a 6.0 on 18 psi. I am limited to .560" with the BTR single coil valve springs I already have. Was just going to leave the stock cam in it, but what would you suggest?
Last edited by Ford_Assassin; 02-03-2020 at 03:33 PM.
Ford Assassin, thanks for checking with us on another cam recommendation.
With this K5/4.8 turbo combo we have a couple cams in mind. 1st option is the truck stage 1 high-lift SUM-8719 that you previously ordered for the C30 dually. This would be a great fit for a K5 with a turbo 4.8. It has -10 overlap so great for driveability, efficiency, and boost. At .550 lift it will work well with your .560 lift springs.
2nd option would be our stage 2 truck cam SUM-8701. Specs are .523/.524, 218/227, 112+2. This has more duration than we would typically recommend for a 4.8. Given the boost and 3000 converter is why we're throwing this in the ring. It has -1 overlap so it will still have good driveability and work well with boost. The IVC event is moved up to 39 vs. 36 of the 8719. With the .523/.524 lift it will work well with your .560 lift springs.
Ford Assassin, thanks for checking with us on another cam recommendation.
With this K5/4.8 turbo combo we have a couple cams in mind. 1st option is the truck stage 1 high-lift SUM-8719 that you previously ordered for the C30 dually. This would be a great fit for a K5 with a turbo 4.8. It has -10 overlap so great for driveability, efficiency, and boost. At .550 lift it will work well with your .560 lift springs.
.
Actually the C30 is getting the 6.0 that came out of the K5 and receiving the 8719 camshaft. I ended up selling the 5.3.
Deffently want to get a cam but debating what one. 8706 or 8716. 6.0 with a t6 1.32 s475, 4l80e, 3200 stall, 3.50 rear gear, and around 3600 lbs. I would think the 8716 would help the turbo spool quicker but how much will be lost down low for street driving?
Or I could be completely wrong, wouldn't be the first time.
Thanks in advance
Deffently want to get a cam but debating what one. 8706 or 8716. 6.0 with a t6 1.32 s475, 4l80e, 3200 stall, 3.50 rear gear, and around 3600 lbs. I would think the 8716 would help the turbo spool quicker but how much will be lost down low for street driving?
Or I could be completely wrong, wouldn't be the first time.
Thanks in advance
You’re right. You could go either way on this with your gear and converter. The earlier exhaust opening of stage 3 SUM-8716 would help the turbo spool. What's offset is a loss of torque off the line from the 4 degree later intake closing. We’re leaning toward the stage 2 SUM-8706 and know it will make you happy. If your traction limited, you might actually be a little faster with 8716. If you have a lot of hook, stage 2 is likely going to accelerate a little harder. To give you an idea, we’re actually using our stage 3 over our own stage 4 in a 408 CID project.
You’re right. You could go either way on this with your gear and converter. The earlier exhaust opening of stage 3 SUM-8716 would help the turbo spool. What's offset is a loss of torque off the line from the 4 degree later intake closing. We’re leaning toward the stage 2 SUM-8706 and know it will make you happy. If your traction limited, you might actually be a little faster with 8716. If you have a lot of hook, stage 2 is likely going to accelerate a little harder. To give you an idea, we’re actually using our stage 3 over our own stage 4 in a 408 CID project.
cool thanks
I think I will try the stage 3,. It is in a s10 so not a lot of weight out back to help with traction. Worst case scenario i dont like it and swap it out for a stage 2 someday.
I have a 5.3 with a cam close to the stage 2 right now but with stock converter in it. Its pretty sluggish down low right now cant get much worse lol
What 4l80e 3500rpm converters do you have for a 5.3/S480 billet wheel application G body street car, appx 1000hp? Please, no B&M or TCI ones. If your house brand is good, will try it. Thanks!
cool thanks
I think I will try the stage 3,. It is in a s10 so not a lot of weight out back to help with traction. Worst case scenario i dont like it and swap it out for a stage 2 someday.
I have a 5.3 with a cam close to the stage 2 right now but with stock converter in it. Its pretty sluggish down low right now cant get much worse lol
Good deal. It comes down to your decision about what you think will work best for you.
SUM 8717 designed to work with 6.0 ly6 with 823 heads?
The Stage 4 turbo cam SUM-8717 is close on piston to valve clearance with the big 2.165 intake valves. Intake clearance will be .061” on a piston without valve reliefs. The stage 4 is happiest with big displacement, rpm, converter, gear, and a valvetrain happy in the 7500+ range. This may be the cam for you, but can you tell us a little more about your combination and goals?
01-21-2020, 03:36 PM
