[DeTomaso] About porting a Performer Air-Gap

[Dave Londry]

I'll try the leave-it-alone option for now.
Edelbrock calls it 1500 to 6500 so we'll  see how it spins up.
It looks like there's a northwest dyno day coming up in September.
The dyno numbers may not be portable but I'll be able to see the shape 
of the torque curve.
dave

 From Dan
--------------

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.  For most applications,
I'd leave it alone.

Dan


On 6/19/2011 11:06 AM, 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