4.2L stroker Custom grind cam question

[JohnnyC]

Looking for high RPM power, peaking around 6500rpm on a 4.2L stroker. I want to retain enough vacuum for the brakes to work right etc... I came up with these numbers and the desktop dyno says 390+HP@6500rpm and 356tq@5000rpm :) Does this sound okay? Is 20 degrees valve overlap too much? Here's what I came up with...

245/255* Duration
.555/.555 @ 1.6:1 rocker ratio
115 LSA
115 Intake Centerline

Would this be overcamming a 4.2L stroker? I think for 300+ rwhp maybe higher RPM cam/valvetrain might be the trick as long as the heads can flow enough for the setup.

[gotchocmilk39]

Re: 4.2L stroker Custom grind cam question

Looking for high RPM power, peaking around 6500rpm on a 4.2L stroker. I want to retain enough vacuum for the brakes to work right etc... I came up with these numbers and the desktop dyno says 390+HP@6500rpm and 356tq@5000rpm :) Does this sound okay? Is 20 degrees valve overlap too much? Here's what I came up with...

245/255* Duration
.555/.555 @ 1.6:1 rocker ratio
115 LSA
115 Intake Centerline

Would this be overcamming a 4.2L stroker? I think for 300+ rwhp maybe higher RPM cam/valvetrain might be the trick as long as the heads can flow enough for the setup.

I e-mailed Sam over at COME RACING about the cam using with the 4.2l stroker and this is what I got:

There are many possible cam choices. Over here we would use a grind
anywhere from 220 degrees @.050" to 230 degrees @.050" for the intake lobe.

Choices will also vary with transmission type, rear end ratio and the
true final use of the car (street only, street but mainly strip use etc.)

Heres the e-mail address: come@comeracing.com