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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 DONE AT SEA LEVEL AT 28” ON A SF1020 BENCH.

Updated as of 06/14/2017


CH318A / CH318B

INTAKE EXHAUST 
LIFTCFMLIFTCFM
0.10068.20.10057.2
0.200124.10.200114.1
0.300179.60.300155.3
0.400213.80.400180.0
0.500227.00.500187.3
0.600233.10.600188.7
0.7000.700

CH350I

INTAKE EXHAUST 
LIFTCFMLIFTCFM
0.10071.20.10059.4
0.200134.60.200105.2
0.300189.40.300139.8
0.400216.90.400144.1
0.500225.80.500144.5
0.600213.40.600142.3
0.700212.20.700143.1

CH350C

INTAKE EXHAUST 
LIFTCFMLIFTCFM
0.10071.20.10059.4
0.200134.60.200105.2
0.300189.40.300139.8
0.400216.90.400144.1
0.500225.80.500144.5
0.600213.40.600142.3
0.700212.20.700143.1

CH350H

INTAKE EXHAUST 
LIFTCFMLIFTCFM
0.10071.20.10059.4
0.200134.60.200105.2
0.300189.40.300139.8
0.400216.90.400144.1
0.500225.80.500144.5
0.600213.40.600142.3
0.700212.20.700143.1

CH350G

INTAKE EXHAUST 
LIFTCFMLIFTCFM
0.10071.20.10059.4
0.200134.60.200105.2
0.300189.40.300139.8
0.400216.90.400144.1
0.500225.80.500144.5
0.600213.40.600142.3
0.700212.20.700143.1

CH364C

INTAKE EXHAUST 
LIFTCFMLIFTCFM
0.2001550.200107
0.3002110.300142
0.4002620.400168
0.5002930.500179
0.6003140.600189
0.7003260.700194

CH454A

INTAKE EXHAUST 
LIFTCFMLIFTCFM
0.10075.90.10066.0
0.200144.20.200126.6
0.300214.50.300168.9
0.400273.90.400204.6
0.500326.40.500231.0
0.600355.60.600252.9
0.700362.80.700271.2

CH454B

INTAKE EXHAUST 
LIFTCFMLIFTCFM
0.10077.70.10072.9
0.200141.50.200128.3
0.300209.40.300169.9
0.400271.90.400206.2
0.500325.60.500228.1
0.600259.40.600251.2
0.700371.20.700268.4
0.800375.70.800278.9

CH502A

INTAKE EXHAUST 
LIFTCFMLIFTCFM
0.10074.20.10074.5
0.200142.60.200123.5
0.300220.40.300150.6
0.400270.20.400173.3
0.500302.40.500192.8
0.600314.70.600214.2
0.700320.40.700226.4
0.800278.90.800278.9

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

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

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

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

 

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