DeTomaso Mailing List: March 2000, Message #88

I note you don't mention your intended manifold selection.  I highly
recommend a dual-plane for street use.  The Pantera gear ratios put you in
the low RPM range a lot on the street.

I had a 10:1 with American 4V heads and a single plane Weiand manifold and a
similar cam.  A 650 double pumper had crisper throttle response on the low
end, a 750 double pumper had more torque on the mid and upper end.   I
attribute the bottom-end "sleepiness" of the 750 to poor atomization of fuel
due to the single plane and low velocities in the big ports.  The dual plane
manifold cuts the plenum averaging effect in half, the Aussie heads will
have higher port velocities, so this will likely off-set the bottom end
effects I saw, so I would heavily lean toward the 750.  I have always much
preferred mechanical secondaries over the vacuum type.

I would never put a 600 on a 351 Cleveland.


----- Original Message -----
From: <Cars5244@aol.com>
To: Multiple recipients of list <detomaso@realbig.com>
Sent: Thursday, March 02, 2000 3:50 PM
Subject: 600 or 750?


> Sorry for all the questions, but you guys have been through this before. I
> really do appreciate you input.
>
> Engine will be 20 over  KB #148 pistons, approx. 10 to 1 using Aussie
heads,
> Crane cam 524421( 226/230 @ .050, 528/536 110 LC. Will be for street use.
> Should I use the 600, would that be the 80457S or 750 80508S or is there
> another model for each?
> Thanks,
>
> Skip
>