i have an 87 350 block and its machined for a roller cam. if i made about 325-350p with a XE 268 flat tappet cam how much would the XR270HR be worth?

 

Enough that you should seriously consider using it.

Rollers have lots of advantages; much faster valve action, better oil life and lower oil temp, reduced HP losses, usually more lift more of the time resulting in greater flow.

Although, I believe you'll find that the XR276, not the 270, has the equivalent .050" duration to the XE268.

 

thanks, do you think the LT4 HOT cam would be a good daily driver cam?

 

There are a lot of people on these boards running the HOT cam. What are you cylinder heads?

 

Before you sink $$$mega bucks$$$ into a roller cam and valvetrain set up that will at best make 20-25hp more than an equivelent properly selected good hyd flat tappet cam, (especially with stock heads) Sink the money into some good cylinder heads. There is much more power and torque there.
{for the $$$'s spent} We're talking 80-100hp and a ton of torque difference between stock heads and aftermarket heads like DART or Protopline.

Do the math.

I cringe when people go out and buy $400 race roller rockers and bolt them on a stock motor.