head flow related info

[grumpyvette]

(you really need to read thru this first)

http://www.alaniztechnologies.com/headterms.html

http://racingfeed.com/downloads/chevy_flow_data.pdf

http://www.j-performance.com/index.php? ... view&id=28

http://www.ask.com/bar?q=+Chevrolet+cyl ... re-26.html
on the better 23 degree SMALL BLOCK AFTERMARKET HEADS THERE'S ABOUT 5.5 INCHES OF INTAKE PORT LENGTH ON AVERAGE FROM INTAKE GASKET TO THE BACK OF THE INTAKE VALVE AT THE FAR EDGE
http://www.rbracing-rsr.com/runnertorquecalc.html

http://www.dw1977.cz28.com/photo2.html

http://racingfeed.com/downloads/chevy_flow_data.pdf

http://home.earthlink.net/~hennad/results.html

http://www.malcams.com/legacy/misc/headflow.htm

http://users.erols.com/srweiss/tablehdc.htm

http://www.purplesagetradingpost.com/su ... l#GM%20LT4

http://www.kendrick-auto.com/head_flow_figures.htm


READ THRU THESE

http://www.gofastnews.com/board/technic ... lumes.html

http://www.gofastnews.com/board/technic ... areas.html

viewtopic.php?f=52&t=796

viewtopic.php?f=52&t=322

viewtopic.php?f=52&t=534

viewtopic.php?f=52&t=389

viewtopic.php?f=52&t=333

The flowbench is a machine that measures the airflow through the ports by sucking air thru like a vacuum cleaner. The vacuum gauges on the bench actually measure the resistance to the flow thru the ports, and the result is converted into CFM. That means "how many Cubic Feet of air will flow through the port per Minute."

 

[grumpyvette]

BIG BLOCK CYLINDER HEAD COMPARISON ON CHEVY HIGH PERFORMANCE tested on the same 502 BBC
All flow figures on best ports, NOTICE THE TQ STAYS AT ALMOST THE SAME PEAK due to similar compression and displacement but the HP varies with the flow rates as the rpms increase

AIR FLOW RESEARCH 325cc

http://www.airflowresearch.com/17-23.pdf
$2485 ALUMINUM
Max hp 665
Max tq 593
intake
.200-158
.300-235
.400-298
.500-341
.600-370
.700-362
exhaust
.200-127
.300-188
.400-244
.500-268
.600-278
.700-285

BRODIX RACE RIGHT 294cc
$2393 per pair
Max hp-634
Max tq-582



intake
.200-141
.300-212
.400-269
.500-310
.600-332
.700-340
exhaust
.200-120
.300-159
.400-186
.500-212
.600-238
.700-262

Dart cnc pro1 335cc
$3654 per pair
Max hp660
Max tq598
intake
.200-154
.300-222
.400-280
.500-322
.600-355
.700-374
exhaust
.200-124
.300-175
.400-233
.500-272
.600-292
.700-311

EDELBROCK 454R 315cc
Aluminum # 60559 $1779 per pair
Max hp-616
Max tq-566

intake
.200-130
.300-198
.400-256
.500-287
.600-311
.700-326
exhaust
.200-122
.300-158
.400-185
.500-211
.600-236
.700-253


RACINF HEAD SEARVICE 320CC
Cast iron $2534 per pair
Max hp -638
Max tq-584

intake
.200-132
.300-199
.400-266
.500-319
.600-338
.700-356
exhaust
.200-113
.300-163
.400-197
.500-228
.600-259
.700-280

TRICKFLOW 320cc
Aluminum $2095cc

Max hp- 655
Max tq-587

intake
.200-146
.300-215
.400-271
.500-321
.600-353
.700-358
exhaust
.200-128
.300-171
.400-207
.500-243
.600-271
.700-290

world products 310cc MERLIN III
Aluminum
$2447 per pair
Max hp-631
Max tq-581

intake
.200-136
.300-200
.400-254
.500-297
.600-330
.700-345
exhaust
.200-105
.300-144
.400-173
.500-197
.600-217
.700-233

 

[grumpyvette]

Weingartner Racing posted this info

BBC head flow including the new AFR 290cc
I just got my Brezinski set up in a decided to flow as many heads BBC heads as possible. I flowed all of these on a 4.310 bore and no exhaust pipe attached. I flowed the exhaust without an exhaust pipe attached and I only flowed the long port(the better flowing one). Here are the numbers enjoy.
AFR 290cc oval port cnc ported 2.25/1.88
INT EX
.2-167------141
.3-242------212
.4-298------242
.5-328------267
.6-356------274
.7-370------279
GM 820 2.19/1.88 this one has a weird chamber compared to the other 820s
INT EX
.2-145--------132
.3-207--------166
.4-256--------193
.5-295--------201
.6-308--------214
.7-301--------221
GM 702 BBC oval port closed chamber ported 2.19/1.88 33degree back cut on valves
INT EX
.2-180-------121
.3-247-------146
.4-283-------173
.5-307-------197
.6-314-------211
.7-314-------223
GM 990 BBC rectangle port valve job and bowl cutter used 2.19/1.88 33degree back cut on valves
INT EX
.2-183--------122
.3-245--------152
.4-290--------176
.5-317--------198
.6-329--------208
.7-338--------213
.8-341--------213
GM 291 BBC Rectangle port closed chamber stock 2.19/1.88
INT EX
.2-141---------112
.3-207---------139
.4-251---------163
.5-288---------180
.6-289---------194
.7-291---------197
GM 148 BBC ported 2.19/1.88 33degree back cut on valves
INT EX
.2-170-------139
.3-228-------156
.4-268-------177
.5-306-------196
.6-334-------212
.7-348-------223
.8-349-------230
BMF 310cc cnc ported 2.30/1.88
INT EX
.2-151------133
.3-219------171
.4-273------216
.5-317------258
.6-352------274
.7-372------289
.8-377------300
Dart 360cc 2.30/1.88
INT EX
.2-166--------107
.3-235--------147
.4-283--------183
.5-327--------210
.6-351--------230
.7-365--------244
.8-379--------257
RHS cast iron 320cc I ported the bowl only 2.25/1.88
INT EX
.2-163------136
.3-240------180
.4-281------212
.5-327------242
.6-361------261
.7-365------267
.8-373------271
GM Bowtie ported to the MAX 2.19/1.88
INT EX
.2-170------131
.3-241------163
.4-275------186
.5-307------208
.6-336------224
.7-358------235
.8-373------245
GM 820 oval port ported by me only on the bowl. This is one of my test heads 2.25/1.88
INT
.2-156
.3-220
.4-273
.5-295
.6-315
.7-337
.8-350
The only heads I ported on were the RHS 320cc and the GM 820. The others were ported by customers. They gave me permission to post. No port job besides the Bowtie head is anything more than the bowl. I was extremely happy with how the AFR head did and the 702 head. Both of those heads suprised me. The AFR looks tiny compared to the other heads I was flowing (you could probably put two of the AFRs ports in one of the Bowties) and moved a ton of air. The 702 has great low lift flow and I plan to do work on that head just to see what it will do. I plan on buying a 4.60 bore and slider just to see what will happen then. For the record I am not a dealer for any of the heads above. I am just giving you information.