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Mail From: (email redacted) (Charles Molineux)


First let me begin by saying that out of the box GT-40 just plain
DONT flow.
I got a great deal on a brand-new set of GT-40's. Here's what they flowed
out of the box...

Lift (in) 0.100 0.200 0.300 0.400 0.500
0.600

Intake (CFM) 38.01 98.71 128.07 168.53 179.66 179.66

Exhaust (CFM) 26.69 69.25 94.24 104.06 107.59 107.59

Note: Test standards- 25 in H20, 60% humidity, CFM are corrected values

Now for an aftermarket head that is really pitiful...

I added Mildon SS 1.90in and 1.60ex chevy valves 3-angle valve job with 30=
=B0
backcut. Opened up the bowls, lowered the floors to s/s radius/ raised roof
.060. ( Ford Mtrsprt had enlarged the radius, but left the floor and roof
alone... causing a "wall" Went back to the flowbench and got this:

Lift (in) 0.100 0.200 0.300 0.400 0.500
0.600

Intake (CFM) 51.84 118.91 164.59 199.62 201.36 212.38

Exhaust (CFM) 43.26 92.41 126.07 129.50 128.18 128.62

Note: Test standards- 25 in H20, 54% humidity, CFM are corrected values

Well that was a lot better but it took about 12 hours of solid work (not
incl flowing)

Next I Lowered the floor another .080, expanded s/s radius, radiused from
the seat, cleaned up and polished the guide areas, squared the exhaust
ports, fully polished the exhaust ports, deburred intake ports, blended and
smoothed out the bowls... Went back to the flow bench and came away with...

Lift (in) 0.100 0.200 0.300 0.400 0.500
0.600

Intake (CFM) 62.98 127.21 174.65 221.34 237.41 242.94

Exhaust (CFM) 53.07 93.76 129.62 151.82 162.39 163.59

Note: Test standards- 25 in H20, 51% humidity, CFM are corrected values

Now those are heads that flow!!! The exhausts bottomed out above 0.600 and
the intakes climbed until 0.700 but my cam (with 1.60 rockers) only pulls
about 567 lift. All in all I probably spent 30 hours porting and flowing
and porting and flowing.... I am happy with the way they turned out, but if
I had not gotten such a good deal on the GT's then it probably would have
been better to go with a Dart II casting or a Edelbrock aluminum head. But
now these heads flow a lot better than both a mildly ported set of J-302's
and a set of Edelebrock's.
So what the heck, it was fun


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Hasta La Vista
Charles Molineux
(email redacted) "The Surgeon General never said anyth=
ing
1968 Ford Mustang Coupe (289) about smokin' the competition!!!!"
Best time 13.6 @ 102mph
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