Edelbrock Cylinder Head Flow Data


COMPARING FLOW DATA
When comparing airflow numbers between heads, there are several things to consider. These are general guidelines... not absolutes... but guidelines that should be considered when purchasing cylinder heads.

1. YOU MAY NOT BE GETTING "APPLES-TO-APPLES" COMPARISON.
Flow bench measurements are only useful and accurate when done carefully and on a calibrated bench. Proper alignment of the head with the bore is required to simulate exact geometry of the engine. Accurate lift measurements are also required. Finally, atmospheric conditions are needed to interpret the data. As a result, you may not be getting an "apples-to-apples" comparison when comparing numbers from different benches.

2. BIGGER IS NOT ALWAYS BETTER!
A large port doesn't always mean more power. This is especially true with street heads and in some cases, race heads. Velocity is just as important as flow. A smaller port volume generally equates to higher velocity for better street performance. The speed of the mixture determines how tightly the combustion chamber is packed. The more tightly packed the combustion chamber, the more pressure is developed when the mixture is ignited, pushing the piston with more force for more power. For example: A large port and a big flow number at 0.600" lift means low velocity (especially off-idle to 3500 rpm) and results in less throttle response. For the street, velocity is the key to overall performance.

3. COMPARE PEAK FLOW AND LOW LIFT FLOW.
Cylinder head buyers have a tendency to only consider peak flow numbers. It's important to look at all the flow numbers, from .100" to peak, in order to determine the performance level of a head.

4. TYPE OF VALVE INFLUENCES FLOW.
The type of valves used will influence how well a port flows. A valve with an undercut stem is less of a restriction to flow and will allow a port to flow more, filling the cylinder better and producing more power.

5. CONSIDER THIS FACT FOR STREET APPLICATIONS.
Generally, in a street application, the smaller the valve diameter, the better the velocity and flow will be with the correctly sized port. This holds true for both the intake and the exhaust ports. When you can equal the flow of a larger port and larger valve with a smaller port and smaller valve, you have a much more efficient port, which will generally make more power and use less fuel.

6. WHAT'S THE PRESSURE DIFFERENTIAL?
The pressure differential that a head is flowed at dramatically affects the results. All Edelbrock heads are flowed at 28" of water, which more closely represents what an engine will see. Beware of companies flowing heads at anything less than 28" of water, because that is not a valid comparison with Edelbrock heads.

Cylinder Head Part # Installed
Height
Rates Coil Bind Maximum RPM
#60179, #60519, #60579, #60599, #60779, #60859, #60879, #60979, #60989, #61779, #61909, #5023, #5025, #5073, #5089 1.800" 1.800" = 120 lbs
1.219" = 320 lbs
1.130" Performer cams: 5500 rpm
Performer RPM cams: 6500 rpm
#60175, #60225, #60255, #60515, #60575, #60595, #60715, #60735, #60775, #60895, #60975, #60985, #60995, #61575, #61595, #61775, #602515, #607115, #607315, #608915 1.800" 1.800" = 150 lbs
1.200" = 420 lbs
1.150" Rollin Thunder cams: 6500 rpm
#61939, #79259 1.800" 1.800" = 138 lbs.
1.200" = 326 lbs.
1.140" 6500 rpm
#60229, #60259, #60329, #60359, #60379, #60399, #60719, #60739, #60759, #60899, #60909, #60999, #79899, #5028, #5085 1.850" 1.850" = 128 lbs.
1.270" = 338 lbs.
1.130" Performer RPM cams: 6500 rpm
#60069, #60079, #60929, #61629 1.885" 1.885" = 115 lbs.
1.400" = 280 lbs.
1.160" Performer cams: 5500 rpm
Performer RPM cams: 6500 rpm
#60119, #60139, #60049 1.900" 1.900" = 132 lbs.
1.400" = 312 lbs.
1.160" Performer cams: 5500 rpm
Performer RPM cams: 6500 rpm
#5087, #5027 1.900" 1.900" = 145 lbs.
1.300" = 345 lbs.
1.130" Rollin Thunder cams: 6500 rpm
#60065, #60075, #60815, #60925, #61625 1.885" 1.885" = 140 lbs.
1.380" = 317 lbs.
1.150" Rollin Thunder cams: 6500 rpm
#60455, #60555, #77425, #77485, #79455, #79535, #79555, #604515, #605515 1.975" 1.975" = 175 lbs.
1.375" = 465 lbs.
1.150" Rollin Thunder cams: 6500 rpm
#60459, #60479, #60499, #60559, #60669, #60679 1.975" 1.975" = 125 lbs.
1.475" = 310 lbs.
1.160" Performer cams: 5500 rpm
Performer RPM cams: 6500 rpm
#77189, #77589, #77619 1.900" 1.900" = 145 lbs.
1.300" = 380 lbs.
1.130" 8000 rpm
#77199, #77599, #77629 1.900" 1.900" = 210 lbs.
1.300" = 490 lbs.
1.170" 8000 rpm
#61669 1.950" 1.950" = 235 lbs.
1.250" = 610 lbs.
1.170" 7500 rpm
#61409, #77409, #77459 2.000" 2.000" = 250 lbs.
1.150" = 800 lbs.
1.170" 8000 rpm

 
EDELBROCK CYLINDER HEAD FLOW DATA @ 28" H20
Cylinder head Flow Data numbers are displayed using the following format (Intake/Exhaust).
Cylinder Head Part # .100" .200" .300" .400" .500" .600" .700" .800" .900"
AMC
#60119, #60139 65/52 130/96 192/127 235/163 258/182 260/190 - - -
 
BUICK
#60049 68/58 127/108 190/150 241/173 274/183 273/190 - - -
 
CHEVROLET
#5073, #5089 63/51 125/99 182/131 225/153 248/163 249/168 - - -
#5085, #5087 68/50 136/96 191/132 265/160 272/172 275/175 - - -
#60719, #60739, #60759 63/51 124/94 181/128 227/146 253/157 253/163 - - -
#60899, #60909, #60999 63/51 126/97 180/129 227/148 250/158 249/165 - - -
#608979 61/51 127/95 185/118 217/131 229/137 237/140 - - -
#60859, #60879 64/54 122/96 177/124 217/147 229/166 232/175 - - -
#60979 64/54 130/104 186/140 220/169 232/183 238/190 - - -
#60989 67/57 122/110 175/153 223/182 252/196 259/204 265/207 - -
#79899 66/53 129/103 185/156 231/200 255/202 261/207 260/210 - -
#77589, #77599, #77619, #77629 67/64 119/112 177/153 226/188 265/207 281/217 285/220 - -
#61909 61/52 117/100 174/140 220/167 242/184 232/192 - - -
#61939 65/54 119/107 173/145 255/181 267/187 270/190 - - -
#79949 64/57 134/107 193/147 239/180 274/200 285/210 - - -
#60819 67/60 148/118 221/157 256/184 266/204 273/216 277/221 - -
#50459, #60459, #60479, #604519 74/71 143/128 207/153 250/178 284/200 309/218 - - -
#60499, #61459 73/71 143/128 208/153 251/178 284/200 299/218 - - -
#60559 76/70 146/132 212/156 255/181 294/207 314/228 - - -
#79539, #79559, #79535, #79555 77/64 155/129 235/181 292/214 330/241 354/252 368/257 - -
#79459, #79455 74/69 150/130 227/172 279/197 317/210 337/221 344/230 - -
#77489, #77485, #77479, #77475 72/64 140/122 213/167 273/199 318/223 342/240 346/251 - -
#77409, #77429, #77425 80/62 159/123 234/164 295/197 343/223 369/241 380/255 - -
#61409 - 149/122 227/164 301/196 351/225 385/248 405/268 409/284 414/297
#617569 63/60 150/137 223/190 288/226 353/254 415/277 468/302 496/324 491/328
 
CHRYSLER
#61779, #61775 62/52 119/105 175/142 225/169 251/185 260/190 - - -
#60779, #60775, #60179, #60175 69/64 129/108 188/142 232/171 249/183 251/190 - - -
#5090, #5093 79/70 143/126 207/160 256/188 278/206 291/217 - - -
#60929, #60925, #60189, #60185 79/70 143/126 207/160 256/188 278/206 291/217 292/223 - -
#77929, #77949 85/63 150/118 211/160 261/189 298/207 322/219 325/226 - -
 
FORD
#5023, #5025 65/42 121/92 174/130 216/150 242 /162 249 /168 - - -
#5027, #5028 65/57 128/96 179/128 223/155 253/168 267/175 277/180 - -
#60329 61/55 126/101 179/133 220/152 238/163 243/169 - - -
#60359 64/56 124/103 177/137 221/158 247/167 248/172 - - -
#60229 72/57 132/104 183/142 216/159 245/170 249/174 - - -
#60259 70/57 128/104 183/142 219/163 251/170 255/174 - - -
#602579 62/50 122/93 175/125 213/140 228/146 232/150 - - -
#60379 62/56 126/101 179/133 220/152 238/163 243/169 - - -
#60399 64/56 124/103 177/137 221/158 247/167 248/172 - - -
#79259 78/63 146/119 213/173 257/197 281/205 292/209 - - -
#77179 64/54 127/108 186/140 234/167 268/189 291/195 285/199 - -
#61629, #61625, #61699 58/54 120/105 180/138 227/151 260/161 265/165 - - -
#60069 88/64 153/113 195/148 233/171 265/183 270/200 - - -
#60669, #60679, #61649, #61669 76/67 140/118 207/153 260/180 300/200 319/207 326/207 - -
#60519 67/54 131/102 195/137 245/163 278/179 268/188 - - -
#60515 67/54 131/102 195/137 247/163 256/179 259/188 - - -
 
PONTIAC
#60579 72/56 138/106 198/141 239/163 264/175 275/185 - - -
#60599 71/69 143/120 208/151 253/173 272/191 286/199 - - -
#61569 65/52 140/105 201/131 236/145 250/151 257/156 258/157 - -
#61599 65/52 136/103 199/130 237/146 256/151 263/157 263/159 - -

Edelbrock Tech Note TECH NOTES: Cylinder heads for hydraulic roller cam applications have the same flow characteristics as heads for hydraulic flat tappet cams.