[DeTomaso] Another 408C on the dyno

[Daniel C Jones]

Dave McLain had another 408C on the dyno.  That engine was nearly identical
to the one we previously dyno tested for Glen's Pantera:

 4.030" bore 351C block
 SCAT 4" cast crank
 6.0" SCAT rods
 Probe dished forged pistons
 4V closed chamber heads milled/drilled for screw in studs and guideplates
 approximately 10:1 compression

except that it was fitted with a solid street roller cam, bushed lifter
bores and a Strip Dominator intake (versus Glen's ported Ford dual plane
and hydraulic roller cam).  Dave said the heads weren't as good (had
several previous valve jobs) as the ones I supplied for Glen's engine
so the flow wasn't quite as good.  The cam is a Reed solid roller of
251/260 degrees duration at 0.050" lift, 0.649"/0.649" lift, 108 degrees
lobe separation, installed at 104 degrees.  While this seems like a lot
of cam, Dave claims it's really pretty mild.  The engine is destined for
a '62 Falcon Ranchero.

First pulls on 93 octane through the mufflers and 1 3/4" Mustang headers
resulted in 510 HP at 6300 RPM and 481 ft-lbs at 4600 RPM.  The Magnaflow
mufflers only lost 5 HP compared to open headers but needed the crossover
pipe.  The exhaust crossover also lowered the peak HP by a few hundred RPM.
The Strip Dominator with the 950HP dyno carb did better with a cheap 4 hole
1 inch spacer than with the HVH or open spacers.  With larger Hooker Super
Comp headers and single chamber 3 1/2" Flowmaster mufflers, along with a
customer-supplied carb, they ended up making a best of 525 horsepower at
6350 RPM and about 480 ft-lbs at 4700 RPM with nice flat torque curve.
The larger headers helped but dave thought they would have benefited from
a smaller collector (Kaase saw that on his Engine Masters Cleveland).
Given the cam, it could have used more compression but custom pistons
weren't in the budget.  If this were a drag motor with more agressive cam
(264 at 0.050, mid .700's lift) and 12.5:1 compression, he thought it
would make 600 HP without having to rev very high.

Dan Jones