[DeTomaso] About porting a Performer Air-Gap

[Daniel C Jones]

I didn't hit reply to all before but I agree with Mike.  The intake works
well on 351C and pretty decent on the 408C.  You don't want to simply
port match.  If you port it, you need to port the runner all the way from
plenum to head flange so that the plenum opening is slightly larger than
the head port (1.5 to 3 degrees of taper, ideally).  For most applications,
I'd leave it alone.  It is a tall intake though.

Dan

On Sun, Jun 19, 2011 at 1:06 PM,  <MikeLDrew at aol.com> wrote:
>
> In a message dated 6/18/11 17 52 8, davel at emspace.com writes:
>
>
> So I end up with all these choices
>
> a. Leave it alone as Edelbrock says. (nice to shed one biggish job)
> b. Take it out to 2.30 x 1.56
> c. Take it out to 2.5 x 1.75 (I'd have to be careful about material
> thickness)
> d. Take it out to some other dimension
>
> What do you think maestro?
>
>
> Dan will obviously weigh in with a much more educated opinion.  But I can
> say that when we dynoed my 408 stroker with numerous different intakes,
> including this one, that it performed exceptionally well until about 5000
> rpm or so, at which point performance tailored off.  But it had the meatiest
> torque numbers below 5000 of any intake we tested (going from memory here;
> Dan will certainly provide the actual data and correct that assertion
> slightly).
>
> It seems that the Air Gap is a great place to start.  I don't know if
> porting it will hurt the bottom end in exchange for greater high-end
> performance.  But if you don't plan to be ripping around at high rpm,
> leaving it alone might provide the best solution?
>
> Mike