Ive been looking around at Vortec heads for the past few months (not constantly,lol). I know the GM Vortecs have a very good reputation as do the RHS Pro Torker (no longer available). I finally talked to Summit about flow numbers for their house brand of the Vortecs and this is the conversation that we had via chat messaging
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Colton: Hi, my name is Colton. How may I help you?
Craig: i have been searching the web for flow numbers for you summit brand vortec heads and have had no luck finding anything just curious if summit had flow numbers available for part # SUM-151124
Colton: Let me take a look.
Colton: LIFT INT EXH
.200 126 108
.300 185 125
.400 221 136
.500 232 138
Craig: and this is for sure for the Summit Racing Vortec Cylinder head, correct?
Colton: Correct
Craig: do you know if these heads are setup to run a hydraulic roller camshaft?
Colton: The springs in these are for flat tappet cams.
Craig: okay, and these heads are only available assembled and not bare, correct?
Colton: Correct.
Craig: okay, that's all I have for now. Thank you for your time
Colton: We appreciate your business.
Thank you,
Summit Racing Equipment
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These are flow numbers from http://www.crankshaftcoalition.com/w...1_Vortec_heads
Flow rate of L31 Vortec heads
Lift (in.) Intake (CFM) Exhaust (CFM)
0.100 70 49
0.200 139 105
0.300 190 137
0.400 227 151
0.500 239 160
0.600 229 162
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Comparison
Flow rate of L31 Vortec heads
Lift (in.) Intake (CFM) Exhaust (CFM)
0.100 70 49
0.200 139 105
0.300 190 137
0.400 227 151
0.500 239 160
0.600 229 162
Flow rate of Summit Brand Vortec Heads
LIFT INT EXH
.200 126 108
.300 185 125
.400 221 136
.500 232 138
I'm not posting this to promote either head I am posting this because I was looking for flow numbers for the Summit vortecs and didn't find any information on them so I wanted to add this to our search results for future researchers.
I don't know how close flow numbers should be when comparing heads to put them in the same "performance" category but the intake flow numbers seem close but the exhaust is where the summit heads fall short. I would like to hear some thoughts on comparison of these flow numbers.
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Colton: Hi, my name is Colton. How may I help you?
Craig: i have been searching the web for flow numbers for you summit brand vortec heads and have had no luck finding anything just curious if summit had flow numbers available for part # SUM-151124
Colton: Let me take a look.
Colton: LIFT INT EXH
.200 126 108
.300 185 125
.400 221 136
.500 232 138
Craig: and this is for sure for the Summit Racing Vortec Cylinder head, correct?
Colton: Correct
Craig: do you know if these heads are setup to run a hydraulic roller camshaft?
Colton: The springs in these are for flat tappet cams.
Craig: okay, and these heads are only available assembled and not bare, correct?
Colton: Correct.
Craig: okay, that's all I have for now. Thank you for your time
Colton: We appreciate your business.
Thank you,
Summit Racing Equipment
--------------------------------------------------------------------------------
These are flow numbers from http://www.crankshaftcoalition.com/w...1_Vortec_heads
Flow rate of L31 Vortec heads
Lift (in.) Intake (CFM) Exhaust (CFM)
0.100 70 49
0.200 139 105
0.300 190 137
0.400 227 151
0.500 239 160
0.600 229 162
--------------------------------------------------------------------------------
Comparison
Flow rate of L31 Vortec heads
Lift (in.) Intake (CFM) Exhaust (CFM)
0.100 70 49
0.200 139 105
0.300 190 137
0.400 227 151
0.500 239 160
0.600 229 162
Flow rate of Summit Brand Vortec Heads
LIFT INT EXH
.200 126 108
.300 185 125
.400 221 136
.500 232 138
I'm not posting this to promote either head I am posting this because I was looking for flow numbers for the Summit vortecs and didn't find any information on them so I wanted to add this to our search results for future researchers.
I don't know how close flow numbers should be when comparing heads to put them in the same "performance" category but the intake flow numbers seem close but the exhaust is where the summit heads fall short. I would like to hear some thoughts on comparison of these flow numbers.