Performance Advantage
Check out the horsepower gains over stock:
"It goes undetected and looks stock appearing."


Chevy Bowtie Performance Advantage
Look at the
low lift flow!

Note:
Low lift flow
is more
important
than the high
number.
Valve Lift
Stock Intake
Ported Intake
Stock Exhaust
Ported Exhaust
.200
135
144
100
112
.300
181
202
122
146
.400
204
236
128
162
.500
211
246
128
172
.600
214
252
127
178

Add up to 40hp on Chevy Bowtie!
Flow numbers are subject to increase without notice.
We constantly improve the performance of these heads.

Cast iron heads are ported and disguised to be a stock appearing cylinder.

*Performance Advantage is also available for all other cast iron heads.


Chevy Vortec Performance Advantage
Look at the
low lift flow!!

Note:
Low lift flow
is more
important
than the high
number.
Valve Lift
Stock Intake
Ported Intake
Stock Exhaust
Ported Exhaust
.200
149
150
105
106
.300
199
207
133
140
.400
225
234
140
164
.500
226
244
145
173
.600
226
245
147
178

Add up to 30-35hp on Chevy Bowtie!
Flow numbers are subject to increase without notice.
We constantly improve the performance of these heads.

Cast iron heads are ported and disguised to be a stock appearing cylinder.

*Performance Advantage is also available for all other cast iron heads.

Dart Iron Eagle performance advantage
Look at the
low lift flow!

Note:
Low lift flow
is more
important
than the high
number.
Valve Lift
Stock Intake
Ported Intake
Stock Exhaust
Ported Exhaust
.200
133
142
106
106
.300
188
195
134
134
.400
231
241
154
160
.500
255
271
164
181
.600
252
282
169
190

Add up to 40hp on Dart Iron Eagles!
Flow numbers are subject to increase without notice.
We constantly improve the performance of these heads.

Cast iron heads are ported and disguised to be a stock appearing cylinder.

*Performance Advantage is also available for all other cast iron heads.


Ford N 351 Performance Advantage

Look at the
low lift flow!

Note:
Low lift flow
is more
important
than the high
number.
Valve Lift
Stock Intake
Ported Intake
Stock Exhaust
Ported Exhaust
.200
139
150
103
109
.300
185
204
118
134
.400
213
238
139
162
.500
232
264
154
181
.600
241
277
162
193

Add up to 40-45hp on Ford N 351!
Flow numbers are subject to increase without notice.
We constantly improve the performance of these heads.

Cast iron heads are ported and disguised to be a stock appearing cylinder.

*Performance Advantage is also available for all other cast iron heads.

Head Package Options:


Labor to port flow, disguise, pressure check, valve job, and grind valves.

Machine work (Angle Mill, correct flanges, correct bolt holes and spot face).

45cc chambers

Call for more details and pricing information.