If factory big-block Mopar heads cause confusion, it's no wonder. The back-cut valves were just as effective in the template-ported heads, and were installed for the tests shown here. 383 400 440 BIG BLOCK MOPAR HEAD # 3462346 ROAD RUNNER CHALLENGER CUDA 1971-73. Details about Mopar Dodge Plymouth Big Block Heads Porting Templates P4120437 383. May 01, 2017 These heads are also offered in ported form where the Indy Heads version (339) and the Brodix B1-BA version (340) are equal, so economics can again be used to select between these two heads. The latest data indictes that the newest B1-BA CNC-ported head by Koffel’s Place makes more than 360 cfm, which makes it the best-ported small-block head. Apr 14, 2019 For port matching your intake and heads, you can find your ideal intake manifold gasket to use as a template. Holley Performance/Mr Gasket offers this port gauge I use with 28 popular port sizes for small- and big-block Chevy heads. The hard plastic material makes scribing your heads easier. The Tools Basic head-porting tools will not break the.
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This chart is a collection of published flow numbers for different types of cylinder heads. They are sorted by max intake flow at 0.500' lift, which is frankly a completely arbitrary way of doing it. Our reasoning is that we are looking for high flow at higher rpm. But that doesn't mean that heads higher on the chart are necessarily 'better'. As a good example of this, note how the W2 cylinder heads are ranked higher than the Edelbrock heads, because at 0.500' lift the intake side flows better. But if you compare the heads across the board, the Edelbrock heads outflow the W2 heads at almost every other point during the cycle. Chances are, the Edelbrock heads probably provide more useable horsepower even if the peak numbers are slightly off. So, it's important to study the complete chart, not just the single data point.
Now, everyone always says that cylinder head numbers are not comparable, that the same set of heads can flow differently on different benches. That is like saying that dragstrip timeslips from two different tracks are not comparable. While it is true that you wouldn't want to treat the exact numbers as gospel, having a look at the flow table at least gives a general idea of what certain heads are capable of producing.
No. | |||||||||||||||
0.05 | 0.10 | 0.20 | 0.30 | 0.40 | 0.50 | 0.60 | 0.05 | 0.10 | 0.20 | 0.30 | 0.40 | 0.50 | 0.60 | ||
1 | 994 W2 Econo Mildly Ported | N/A | 60 | 127 | 184 | 232 | 274 | 302 | N/A | 50 | 105 | 154 | 185 | 200 | 208 |
2 | 915J Fully Ported, 2.02' Valves | N/A | 62 | 130 | 186 | 239 | 272 | 277 | N/A | 52 | 101 | 132 | 166 | 173 | 178 |
3 | 994 W2 'Econo' | N/A | 59 | 122 | 182 | 229 | 263 | 265 | N/A | 51 | 110 | 154 | 173 | 176 | 174 |
4 | Edelbrock Mildly Ported | N/A | 72 | 135 | 191 | 233 | 260 | 260 | N/A | 69 | 113 | 142 | 164 | 176 | 183 |
5 | 587 Fully Ported, 2.02' Valves | 32 | 63 | 126 | 181 | 230 | 253 | 241 | 24 | 57 | 95 | 132 | 132 | 160 | 179 |
6 | W2 Mopar Perf. | N/A | 69 | 120 | 173 | 215 | 244 | 254 | N/A | 63 | 113 | 142 | 148 | 151 | 151 |
7 | Edelbrock | N/A | 72 | 126 | 179 | 224 | 239 | 242 | N/A | 66 | 110 | 139 | 158 | 170 | 176 |
8 | 051 Fully Ported, 2.02' Valves | 40 | 77 | 137 | 186 | 225 | 228 | 224 | 27 | 52 | 104 | 140 | 159 | 168 | 175 |
9 | 894 Stock 340X | 32 | 58 | 125 | 172 | 208 | 221 | 210 | 22 | 45 | 95 | 122 | 135 | 140 | 142 |
10 | 915J Stock | N/A | 66 | 123 | 170 | 206 | 220 | 216 | N/A | 63 | 110 | 135 | 145 | 148 | 148 |
11 | 140 Magnum R/T | 34 | 70 | 137 | 181 | 209 | 211 | 211 | 24 | 62 | 111 | 142 | 163 | 168 | 171 |
12 | 137 Magnum | 31 | 60 | 118 | 165 | 195 | 209 | 205 | 23 | 54 | 99 | 131 | 167 | 138 | 138 |
13 | 596 Stock | 27 | 53 | 107 | 159 | 185 | 199 | 193 | 22 | 48 | 89 | 114 | 121 | 123 | 124 |
14 | 051 Stock | 30 | 50 | 113 | 165 | 188 | 193 | 189 | 23 | 49 | 97 | 123 | 133 | 137 | 137 |
15 | 576 High Swirl | 31 | 62 | 112 | 160 | 182 | 192 | 187 | 23 | 55 | 99 | 119 | 126 | 128 | 130 |
16 | 587 Stock | 27 | 52 | 107 | 162 | 195 | 191 | 192 | 22 | 46 | 87 | 112 | 121 | 124 | 126 |
1. Tony West's Rollin' Thunder website, www.geocities.com/alwest_83/
2. Moparts, Carl's Tech Archive, '974 Flow Test Results, Part 2', 2-19-2002, www.moparts.com
3. Tony West's Rollin' Thunder website, www.geocities.com/alwest_83/
4. High Performance Mopar magazine, 7-1999.
5. Car Craft magazine, 2-2002.
6. High Performance Mopar magazine, 7-1999.
7. High Performance Mopar magazine, 7-1999.
8. Mopar Muscle magazine, 1-2000 & 2-2000.
9. Mopar Muscle magazine, 1-2000 & 2-2000.
10. High Performance Mopar magazine, 7-1999.
11. Car Craft magazine, 2-2002.
12. Car Craft magazine, 2-2002.
13. Car Craft magazine, 2-2002.
14. Mopar Muscle magazine, 1-2000 & 2-2000.
15. Car Craft magazine, 2-2002.
16. Car Craft magazine, 2-2002.
2. Moparts, Carl's Tech Archive, '974 Flow Test Results, Part 2', 2-19-2002, www.moparts.com
3. Tony West's Rollin' Thunder website, www.geocities.com/alwest_83/
4. High Performance Mopar magazine, 7-1999.
5. Car Craft magazine, 2-2002.
6. High Performance Mopar magazine, 7-1999.
7. High Performance Mopar magazine, 7-1999.
8. Mopar Muscle magazine, 1-2000 & 2-2000.
9. Mopar Muscle magazine, 1-2000 & 2-2000.
10. High Performance Mopar magazine, 7-1999.
11. Car Craft magazine, 2-2002.
12. Car Craft magazine, 2-2002.
13. Car Craft magazine, 2-2002.
14. Mopar Muscle magazine, 1-2000 & 2-2000.
15. Car Craft magazine, 2-2002.
16. Car Craft magazine, 2-2002.
Factory Casting Cheat Sheet |
Considering the variation in the flow numbers of stock castings, it might be a good idea to have any set of stock castings flow tested after cleaning but before modifying. That way there will be a baseline for those specific heads, eliminating any guesswork about performance gains.
Mopar Head Porting Templates For Microsoft
We've also presented a factory casting number cheat sheet. Most casting number sheets list the data chronologically, which is least helpful when you've got a set of heads sitting at a swap meet and you wonder what they fit. Using this sheet, just take the last three digits of the casting number and see where they came from. This sheet only lists heads that were installed on 360 engines, though as the chart shows, the same castings were often used on more than one engine type. Our data after 1983 remains sketchy so we will add to the chart as we learn more.