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Pontiac heads flow numbers
Saturday, May 26, 2018
   
HEAD
.100"
.150"
.200"
.250"
.300"
.350"
.400"
.450"
.500"
.550"
.600"
1970 RAIV #614 Intake
80
110
136
162
189
213
233
248
256
242
 
1970 RAIV #614 Exhaust
54
79
101
121
139
162
180
195
205
213
 
1977 6X-8 Clean up
Intake
81
114
142
160
181
196
203
203
204
204
 
1977 6X-8 Clean up
Exhaust
49
74
95
112
124
132
140
146
151
155
 
1977 6X-8
Intake
82
116
144
159
175
188
196
201
203
203
 
1977 6X-8
Exhaust
51
76
96
108
115
121
125
129
131
132
 
1977 6X-4
Intake
83
119
148
167
182
194
202
208
211
211
 
1977 6X-4
Exhaust
48
74
99
115
126
132
137
140
141
142
 
1975 400 5C
Intake
84
118
143
158
178
192
204
207
208
209
 
1975 400 5C
Exhaust
51
80
105
119
130
139
146
152
156
164
 
1972 455 HO
Intake
80
123
157
184
201
215
226
231
232
233
 
1972 455 HO
Exhaust
63
92
112
128
140
150
162
169
174
178
 
KRE 290 Int.
KREs #s
81
154
215
246
267
286
KRE 290 Ex.
KREs #s
48
112
160
203
230
242
KRE 290 Int.
our #s
77
109
141
177
209
234
258
275
281
284
287
KRE 290 Ex.
Our #s
66
95
118
136
155
171
176
183
189
195
202
KRE 260 Int.
as cast
79
114
148
180
209
229
241
246
248
248
KRE 260 Ex.
as cast
61
96
116
132
167
164
174
182
188
194
199
KRE 260 Int.
cleaned up
78
114
147
180
211
230
246
252
256
258

Flow numbers were obtained using 4.250” bore.

Stock heads / stock valvesflowed @ 28" H2O

6X-8 cleaned up heads are unaltered ports. Just castingflash and machined to cast smoothed.
                                                                                                 

RAIV heads were not stock.They had been previouslyported by unknown person.    

KRE 290 heads were flowed @ 28" H2O valve sizes are 2.11", 1.66" Ferrea 6000 series SS valves the difference in exhaust flow #'s between KRE and us could be KRE perhaps used an exhaust pipe.

KRE 260 heads flowed @ 28" H2O 2.11", 1.66" Ferrea 5000 series valves intake ports were simply cleaned up by smoothing all machining and casting flash exhaust ports were not touched
 
All flow testing was performed by Panaritis Automotive on a SuperFlow SF-600FC flowbench
   

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