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Chevy/GM Cylinder Heads - Breathing On A Budget

Making Gm's Vortec Heads Work Better For Less

EXHAUST PORT TESTS
Exhaust
Lift
0.10
0.20 0.30 0.40 0.50 0.60 0.70
Test 1 45 46 95 135 153 157 156 158
Test 2 4854 100 143 155 156 157 158
Test 3 4452 103 137 151 153 153 154
Test 4 4754 108 142 153 152 152 152
Test 5 55 49 99 139 159 169 173 175
Test 6   104 144 164 171 174 176
Test 7   99 141 162 170 174 177
Test 8   114 147 164 170 172 174
Test 9   110 151 174 187 192 195
Test 10   98 145 167 183 190 192

SOURCES
Mondello Technical School
830 21st St.
Paso Robles
CA  93446
Standard Abrasives
4201 Guardian St.
Simi Valley
CA  93063
SCOGGIN-DICKEY CHEVROLET
(Source for GMPP parts)
5901 Spur 327, Dept. SC
Lubbock, TX 79424
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