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.
I am strongly leaning towards the BTR truck Stage 2 cam. Is it possible to see what my SCR and DCR ratio would be with 59cc heads and .040" head gasket with the fancy calculator you have. I know I don't have all the info on that cam.
So here is a comparison between the Crane I currently have and the BTR Truck Stage 2
-Cam 1: 210/218 .551/.551 116+2 LSA, 114 ICL
-Cam 2: 212/218 .553/.553 113+2 LSA, 111 ICL
That comes out to about 9.0 which is kinda high for pump gas. Although most people don't put too much thought into DCR, so if Brian says that cam will work in your 11.2 engine then I don't see why not. His cams have been proven very nice. Or you can also go with some Cammotion truck cams also, they are similar but you can get any kind of specs you want.
BTR said they designed the cam for 9.5:1 and higher compression ratio engines and the cam was designed to be a "Drop-In" so the cam itself raises the DCR higher to build torque sooner. Maybe I should stay with stock 64.45cc chambers and .051 gasket. Is the DCR around 8.5:1 with stock stuff?
Yeah that makes more sense. Then keep the SCR lower so that you end up with the proper DCR. I would still go with some 0.040 Cometics for better quench.
A 63cc chamber and Cometic HGs would be like 10.6:1 and 8.6 which is fine.
Sounds like a plan, do you know of a website that is fairly accurate that I can calculate the DCR on my own by chance? Just for future reference since I am going to be building a 04 LS6 engine soon.
This is what I came up with. .045" head gasket, Quench at .038, heads milled .035" to achieve 59cc chambers. I am 100% sure on these cam specs this time. I know the picture is kinda blurry, I am trying to figure out how to screen shot. The STC is at 10.74 and DCR is at 8.66, I am hoping to is doable on 91 Octane pump gas.
Ahhhh, you are right. So to be on the safe side I will run a .045" head gasket to keep Quench around .038, then mil the heads to 63cc. Should be at 10.51:1 SCR and 8.49:1 DCR with a cranking PSI of 172 at sea level, now I live in Vegas which is at 2000 ft but travel a lot to sea level. Specs at 2000 ft are 10.51:1 SCR and 8.08:1 DCR with a cranking psi of 161. It seems that is the best for 91 octane without pushing the limits to much. Just want to make sure we are all on the same page now with numbers, is that what you would come up with with what I listed.
Last edited by 07NBSChevy; 05-22-2016 at 10:57 PM.