The Name You Trust for Engine Parts, Cores, & Recycling

EQ CYLINDER HEADS: FLOW NUMBERS

EQ strictly by the numbers. How our heads stack up.

NEED TO KNOW HOW OUR NUMBERS COMPARE AGAINST THE COMPETITION? WE PROVIDE YOU WITH THE FOLLOWING EXTENSIVE LIST OF CYLINDER HEAD FLOW NUMBERS TO HELP YOU DECIDE. ALL CYLINDER HEAD TESTING WAS CONDUCTED IN LAS VEGAS, NV, ON A SUPERFLOW 600

Updated as of 10/20/2020


EQ-CH318A

INTAKE EXHAUST 
LIFTCFMLIFTCFM
0.2001070.200100
0.3001620.300136
0.3501870.350147
0.4001990.400153
0.4502080.450155
0.5002100.500156
0.5502080.550156
0.6002050.600156
0.6502050.650156
0.7002030.700153

EQ-CH318B

INTAKE EXHAUST 
LIFTCFMLIFTCFM
0.2001190.200100
0.3001660.300135
0.3501950.350144
0.4002140.400171
0.4502290.450172
0.5002310.500177
0.5502330.550178
0.6002350.600183
0.6502330.650182

EQ-CH350C

INTAKE EXHAUST 
LIFTCFMLIFTCFM
0.10070.20.10050
0.200121.50.20090.8
0.300172.30.300122
0.400201.60.400137.8
0.5001970.500144.1
0.600197.90.600144.7
0.700198.90.700143.6

EQ-CH350I

INTAKE EXHAUST 
LIFTCFMLIFTCFM
0.2001890.20086
0.3002160.300119
0.3502160.350129
0.4002110.400135
0.4502060.450139
0.5002080.500141
0.5502050.550143
0.6002050.600144
0.6502080.650147

EQ-CH364B

INTAKE EXHAUST 
LIFTCFMLIFTCFM
0.2001310.200106
0.3001900.300141
0.3502190.350156
0.4002380.400164
0.4502530.450172
0.5002660.500178
0.5502740.550183
0.6002680.600185
0.6502610.650188
0.7002610.700189

EQ-CH364C

INTAKE EXHAUST 
LIFTCFMLIFTCFM
0.2001700.200113
0.3002190.300139
0.3502410.350150
0.4002610.400160
0.4502770.450167
0.5002880.500174
0.5502950.550178
0.6003020.600185
0.6503080.650188
0.7003110.700191
0.7502990.750192
0.8002990.800192

EQ-CC200BA

INTAKE EXHAUST 
LIFTCFMLIFTCFM
0.10074.80.10065.5
0.200137.20.200113.3
0.300185.70.300146.9
0.400225.00.400170.2
0.500252.50.500181.7
0.600265.40.600187.8
0.700272.20.700189.5

DYNO RESULTS –
CAM .474” / .510” LIFT
Carb. 650 Holly Run on ZZ4 short block

EQ-CC200BA

RPMTORQEPOWER
2500334.2159.1
2600358.3177.3
2700390.5200.7
2800396.2211.2
2900402.2222.0
3000100.3228.6
3100397.5234.6
3200395.5241.0
3300395.0248.2
3400397.2257.1
3500397.6265.0
3600398.8273.4
3700401.2282.6
3800403.8292.1
3900406.4301.8
4000409.2311.7
4100409.3319.5
4200407.4325.8
4300403.8330.6
4400399.5334.7
4500397.8340.8

EQ-CH350CA

CHEVROLET 350 VORTEC


DYNO RESULTS –
CAM .474” / .510” LIFT
Carb. 650 Holly Run on ZZ4 short block
RPMTORQUEPOWER
3100433.1255.6
3200438.1266.9
3300441.2277.2
3400442.9286.7
3500445296.5
3600447.2306.5
3700449.2316.5
3800450.7326.1
3900451.5335.3
4000451.4343.8
4100449.8351.1
4200447.2357.6
4300444.7364.1
4400441.7370.1
4500439.2376.3
4600437.3383
4700436390.1
4800434.6397.2
4900432.4403.4
5000427.6407.1
5100416.9407.5
5200412.3408.2
5300405.6409.3
5400398.8410
5500391409.5
5600381.1406.3
5700370.6402.2
5800360.5398.1
5900350.5393.7
6000340388.5

 INTAKEEXHAUST
PORT VOLUME170 cc67 cc
PORT DIMENSION1.200” x 2.025”1.350” x 1.400”
VALVE DIAMETER1.940”1.500”
VALVE GUIDE I.D..341”.341”
VALVE GUIDE O.D..530”.530”
CHAMBER VOLUME64 cc

EQ-CH364CA

CHEVROLET LS


DYNO RESULTS –
Stock 6.0L cast iron block. Gen 3
Carb. 650 Holly Run on LS3 short block
RPMTORQUEPOWER
3100430.8254.3
3200432.2263.3
3300430.9270.8
3400430.5278.7
3500431.6287.6
3600432.3296.3
3700434305.8
3800435.5315.1
3900436.8324.3
4000438.5334
4100440.5343.9
4200441.7353.3
4300441.4361.4
4400440.2368.8
4500438.6375.8
4600438.4384
4700437.6391.6
4800433.8396.5
4900430401.2
5000424.5404.1
5100420.8408.6
5200422.3418.1
5300420.1423.9
5400413.4425
5500404.7423.8
5600396.8423.1
5700390.7424.1
5800358.9426.1
5900379.5426.4
6000372.3425.3

 INTAKEEXHAUST
PORT VOLUME258 cc87 cc
PORT DIMENSION2.559”x 1.2515”1.427” x 1.5915”
VALVE DIAMETER2.165”1.590”
VALVE GUIDE I.D..3145”0.3145
VALVE GUIDE O.D..500”.500”
CHAMBER VOLUME69 cc