I have been told by 2 people now that unless I go with at least .600 inch lift and LOTS of duration it is not worth going to an roller cam setup. I have an th350 auto trans with stock converter so I dont wiant to run a huge cam like that. I have a dyno program and the Comp Cams Hydraulic Roller 270HR seem to make way more torque across the whole powerband and seem like a real nice cam. It would be used with Sportsman II headers, full length headders, wiend duel plane intake, and still need to get a nicer carb. Is the roller worth it or should I just get something like a Comp Cams Extreme Energy 268 with some rhoads variable lift and duration lifters. Thanks for your input.

 

Oh ya, specs on 270 roller are LIFT :.495 int .500 exh DURATION 219 int 224 exh

 

here a dyno comparison does it look acuate?

 

IMO it's worth it. A roller can have far more aggressive ramps to snap th evalves open and shut faster, so the valve spends far more of its time in a high-flow condition. As a result, you can get alot more performance out of a roller system than out of a flat with similar specs, without the "too big cam" problems like low idle vacuum etc.

You do need to use better valve springs though: a real (non-factory) roller puts a whole lot more stress on them due to the faster valve motion. Believe the cam mfrs' recommendations in that area.

 

yes they are worth it

you can run less duration to get the same, if not more, lift then a flat tappet cam.
as was stated since you do not need to run all that duration to get that amount of lift you do not have the low end torque, vac and all the other problems a big cam can cause

also there is reduced wear and friction on the valve train that can also net you some more power

 

Yup to all the above. It's just the price

 

Definetly worth it DEPENDING on your application or FUTURE applications.

Faster ramps, more lift with less duration, less stress on the valvetrain.....

It can open the doors for you in case of future engine mods.

OH BTW, I HATE my flat-tappet!

 

I posted this on another site I visit alot and here are some of the responceses. It is a C3 Vette site, I have a 79. Hey were all chevy guys right? Does this sound accurate.
http://forums.corvetteforum.com/zero...ply&id=2483620

 

I'm lucky my car came with a roller cam and lifters.

 

let me try this again
http://forums.corvetteforum.com/zerothread?id=262660

 

your corvette link gives an error
and, I don't think your get 50ft/lbs more torque just by using a hydroller. 20-30 is a little more accurate. And you'l get more than just 10hp. DD2000 is a little simplistic.

Never having to worry about breakin or replacing a single lifter even when you use a new cam. How much is that worth?


I am a little confused by the statement on the vette forum of
Well considering the main reason behind running a hydroller is to go with a more radical cam, why in the F* would consider not?

PS, don't compare it to the 270HR. That is an old version. Compare it with one of the XR series.