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Old 11-13-2013, 08:10 PM   #1
Pesce Nero
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Join Date: Jul 2008
Posts: 2,680
Default stk 317, ported 317, stk l92

so I did some tests tonight with interesting results. not sure how these numbers compare to other benches but its what I got

stock 317 3.95 bore
1. 68, 2. 142 3. 196 4. 228 5. 236 6. 240

stock 317 4.20 bore
.1 79 2. 154 3. 209 4. 247 5. 257 6. 260


ported 317 for boost, swirl hump next to guide left in

on a 3.95 bore
1. 74 .2 153 3. 209 4. 249 5. 278 6. 295

on 4.20 bore
1. 74 2. 153 3. 210 4. 250 5. 278 6. 278



stock l92?(5364) on 3.95 bore
1. 75 2. 148 3. 204 4. 247 5. 274 6. 287

stock l92 on 4.20 bore

1. 83 2. 157 3. 221 4. 272 5. 311 6. 330


I have 2 sets of heads I just recently ported, 241s and 317s and noticed both sets didn't pick up flow over .500 and realized I had them on my 4.20 bore. I have read that a bore larger than the chamber can cause turbulence but never noticed it before till I made the mistake the other day
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