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

What did the 241's flow?

stock port from another 241 head on 3.95 bore

1. 69 2. 123 3. 179 4. 214 5. 223 6. 227


ported 241s in my shop now on 3.95 with swirl hump

1. 74 2. 147 3. 202 4. 240 5. 261 6. 275

on 4.20 bore

1. 74 2. 138 3. 196 4. 240 5. 265 6. 257

Nice.

Reps for some actual tech on here for once lol.

wow that is a huge difference.... never would have thought it would be that drastic, and i will keep my eye on it in the future. thanks for posting!

Not too bad for a monkey with a dremel.