Edelbrock Cylinder Head 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 cylinder 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.

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Comparing Cylinder Head Data

Cylinder Head Part #	Installed Height	Rates	Coil Bind	Maximum RPM
EDELBROCK HEADS
#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

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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	-	-	-

Cylinder Head Part #	.100"	.200"	.300"	.400"	.500"	.600"	.700"	.800"	.900"
BUICK
#60049	68/58	127/108	190/150	241/173	274/183	273/190	-	-	-

Cylinder Head Part #	.100"	.200"	.300"	.400"	.500"	.600"	.700"	.800"	.900"
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	-	-	-
#61029	70/60	140/115	202/156	251/198	285/214	311/220	317/225	-	-
#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	-	-	-
#61319	68/48	142/101	217/150	268/186	304/206	326/215	298/220	-	-
#770468	–	137/85	210/137	285/189	357/231	410/268	435/285	445/298	450/306
#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

Cylinder Head Part #	.100"	.200"	.300"	.400"	.500"	.600"	.700"	.800"	.900"
CHRYSLER
#61779, #61775	62/52	119/105	175/142	225/169	251/185	260/190	-	-	-
#61179, #61175	81/66	157/139	233/195	306/225	357/239	386/242	401/243	409/243	413/242
#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	-	-

Cylinder Head Part #	.100"	.200"	.300"	.400"	.500"	.600"	.700"	.800"	.900"
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	-	-

Cylinder Head Part #	.100"	.200"	.300"	.400"	.500"	.600"	.700"	.800"	.900"
JEEP
#50169	60/63	123/103	179/127	221/144	241/151	237/155	-	-	-

Cylinder Head Part #	.100"	.200"	.300"	.400"	.500"	.600"	.700"	.800"	.900"
OLDSMOBILE
#60519, #60515	67/54	131/102	195/137	245/163	278/179	268/188	-	-	-

Cylinder Head Part #	.100"	.200"	.300"	.400"	.500"	.600"	.700"	.800"	.900"
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	-	-