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-   -   Comp XR275? Or SS2? (https://www.performancetrucks.net/forums/internal-engine-modifications-158/comp-xr275-ss2-554682/)

Bluecollar Hotrods 02-04-2019 01:34 PM
Comp XR275? Or SS2?
 
Putting together an LQ4 with 799s milled .030", NNBS intake, 90mm TB, 1.75" headers, 2.5" true duals, 4.10s, 4L80E/3500 stall. Truck is about 4400lbs. (2000 Sierra Stepside with hardly any options)

What cam would be better? I know specs aren't everything, but the SS2 is the larger camshaft on paper. Why these two and not something else? Because they are what I have on the shelf.

The end goal is to have a quick street truck, maybe hit the track a few times per year.

madmann26 02-04-2019 01:44 PM
I have the xr275 cam in my TMS shortblock with 706s. Gobs of torque and pulls strong to 6500.

My CR is about 11.5:1. Runs fine on 93 with an SD tune.

FFDP 02-04-2019 07:51 PM
Run both.

:fuckyea:

hunterbohanan23 02-05-2019 11:13 AM
Just curious, what are the specs on them?

madmann26 02-05-2019 12:07 PM
Originally Posted by hunterbohanan23 (Post 5456855)
Just curious, what are the specs on them?
XR275

222/224, .568/.566, 112LSA (has +2 advance)

Bluecollar Hotrods 02-05-2019 12:26 PM
The "sloppy stage 2" is 228/230 .585" lift 112 LSA

RedXray 02-05-2019 03:39 PM
Originally Posted by 86 IROC (Post 5456861)
The "sloppy stage 2" is 228/230 .585" lift 112 LSA
with +4* advance

(LSA 112* minus intake centerline of 108* = 4* ground in advance)

Bluecollar Hotrods 02-12-2019 12:10 PM
Originally Posted by RedXray (Post 5456888)
with +4* advance

(LSA 112* minus intake centerline of 108* = 4* ground in advance)
Just realized that you have the same cam, did you ever get on a chassis dyno?


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