BJR Racing

Racing Engines & Heads

Burwood Boys Racing


Before Porting
       
After Porting
       
These are Mopar 'X' heads (894 castings). Before we did any
work to them, they flowed as follows:
Lift
.100
.200
.300
.400
.500
.600
Intake
76
117
181
218
242
241
Exhaust
70
103
129
145
154
151
After doing a good valve job and back cutting the valves: 
Lift
.100
.200
.300
.400
.500
.600
Intake
81
135
190
218
226
226
Exhaust
74
114
138
154
153
155
 
After bowl blending and a radius of the short turns: 
Lift
.100
.200
.300
.400
.500
.600
Intake
81
136
194
224
239
229
Exhaust
74
114
144
192
202
202
 
Using a different intake valve produced: 
Lift
.100
.200
.300
.400
.500
.600
Intake
84
138
202
235
243
242
Exhaust
74
114
144
192
202
202