Roller cam question

[dzbowtie]

Hey guys,

I'm in the process of building a roller cam engine for my lwb 70 c10. The foundation will be a freshly machined oe roller, 2 bolt main, .030 over 355 (638 block). I don't have numbers on deck height right now, it is still at the shop. But for conversations, we'll say stock deck height right now. The idea is to build a strong little engine that has very strong torque numbers and reasonable hp numbers. I do not plan to take the truck to track but just want a hot little street engine that has a good sound and works well with the truck. I'm running a th350 with 3.73 rear gears.
I have a balanced rotating assembly, with hypereutectic +7 cc pistons and stock rod length. I would like to use a set of 062 vortec heads that I already have (just needs to be set up for the chosen roller cam).
Long story short, I was looking at the xr270hr from comp (218/224, .495/.502 if I remember correctly with 1.5 rockers). Do you guys think this is a good cam for the set up, especially with vortecs? Again, the overall idea is strong bottom torque more so than top horsepower, but good hp numbers are a bonus. I do plan to get on it from time to time, but I want to make sure it will work well with the heavy truck and 3.73 gearing. Thank you all for the feedback.

[68c10owner]

Actually that would be a great cam for the vortex heads. Just remember to machine down the valve guides for retainer clearance.

[Tom]

You have a light truck and high gearing, torque won't be a problem.
That's a great cam with vortecs as the intake port stalls at .500" lift, so no point in going over that until you get back to .600" or more lift [which nobody should be doing with vortec really lol]

[Mike C]

I think that is a great cam for your motor/application as well. Look into a 1800-2000 rpm converter. We went that route with my teenagers Jimmy (mild 350, 204/214 cam 3.73 and 35" tire) and the additional stall is great for idle and reducing clunk into gear as well as getting off the line.

[gmc684x4]

I would contact comp cams and varify what valve springs to use to insure no valve bind

[dzbowtie]

thank you all for the feedback. as always, great forum!

[57taskforce]

I’ve actually been looking at this cam for my the 350 I’m currently building for my K20. I’ve got a vortec 350 roller block, stock deck, bore, stroke, and pistons, speed master aluminum 190cc runner, 64cc chamber heads; should be about 9.5:1, 4:11 gears and a sm465. I’m thinking this cam should do pretty well in that combo, but not too rowdy. I’d love to see how you like it if you end up with this cam.

[dzbowtie]

i have looked at several cams for this build. ive looked at some a step up, and some a step down, even different companies. however, i keep coming back to the XR270 for this 355 with vortecs. once i know my block checks out, im going to go ahead and get it. we'll see how it turns out!