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........................................................................................- SBC Cylinder Head Info -

I've compiled the following information on SBC Cylinder heads to help compare them. For the flow remember bigger is not always best. Some of the heads with large flows and big runners are not going to be good street heads, since they will have slow flow through the runners at street rpm. Also if you have a cam with less than .500 inches of lift then the flows at .500 of an inch and above mean nothing to you. A lot of people recommend looking at the flows around .400 for a street motor as that is the lift you will see for a good part of the cam duration.

The flow figures below are from a couple different sources, so we are not necessarily comparing apples to apples, but they should be close.

A special thanks to Paul Shufelt for helping me with some of the numbers below. Finally I need help filling in some of the blank spaces in the charts. If you have any of this missing info or some of this is wrong please e-mail me. Thanks, Sum

AFR 180cc -- AFR 190cc -- AFR Race 210cc -- AFR 205cc LS1 Mongoose Street Head -- AFR 205cc LS1 Mongoose Street Head -- AFR 180 Eliminators -- AFR 195 Eliminators

Brodix 8 Pro -- Brodix Track 1 -- Brodix IK180 -- Brodix IK200

Canfield Aluminum

Dart Conquest 200 -- Dart Iron Eagle 220

Edelbrock RPM -- Edelbrock 23 deg -- Edelbrock Victor Jr.

Edelbrock E-Tec 170 -- Edelbrock E-Tec 200 -- Edelbrock Performer

EngineQuest 50 cc 23 degree Heads

GM Fast Burn -- GM Vortec 855 -- GM Vortec Bow-Tie Small Port

GM Vortec Bow-Tie Large Port -- GM 882 -- GM 441 -- GM 462 -- GM LT1 372

GM L98 Vette -- GM LT4 -- GM LS1

Holley System Max

Patriot Performance

Pro Top Line (Lightning) 180's -- Pro Top Line (Lightning) 200's -- 200 Aluminum

Trick Flow 23 Deg. -- Trick Flow Twisted

World SR Torquers -- World Sportsman II

Manufacturer &

Head Type

Valve Sizes I/E

AFR Street 180cc

Aluminum

2.02/1.60

AFR Street 190cc

Aluminum

2.02/1.60

AFR Race 210cc

Aluminum

2.08/1.60

Edelbrock RPM
.

.

Edelbrock

23 deg

Chamber Size 74cc & 68cc 74cc & 68cc 76cc 64cc & 70cc 71cc
Intake Runner 180cc 190cc & 195cc 210cc 170cc 212cc
Exhaust Runner 64cc 64cc 80cc 60cc 60cc
Flow Int/Exh @

See footnotes:
 *10  *10  *10 *4   *4
0.100 ?/? ?/?   72/61 78/69
0.200 129/108 129/108 135/112 134/105 140/116
0.300 195/156 195/156 197/145 188/140 200/158
0.400 240/178 240/178 245/185 224/160 242/195
0.500 255/190 260/190 273/205 233/172 270/213
0.600 260/194 262/194 282/215 233/179 275/224
0.700     285/220    


Manufacturer &

Head Type

Valve Sizes

Edelbrock
Victor Jr.

Edelbrock
E-Tec 170

Aluminum

1.94/1.50

Edelbrock
E-Tec 200

Aluminum

 2.02/1.60

Edelbrock
Performer

 
Chamber Size 70cc  64cc 64cc  70cc  
Intake Runner 215cc  170cc 200cc 170cc  
Exhaust Runner 60cc  70cc  78cc 60cc  
Flow Int/Exh @

See Footnotes:
 *1  *9  *9  *2  
0.100 67/64 64/54 67/57 66/55  
0.200 123/111 130/104 122/110 135/103  
0.300 173/145 186/140 175/153 186/135  
0.400 219/180 220/169 223/182 215/151  
0.500 255/198 232/183 252/196 220/165  
0.600 275/206 238/190 259/204 222/169  
0.700 284/?   265/207    


Manufacturer &

Head Type

Valve Size
World Sportsman World SR Torquers

Iron

2.02/1.60

Dart Conquest 200

Dart Iron Eagle

Canfield



Aluminum
Chamber Size 64 & 72cc 67 & 76cc   64 & 72cc   
Intake Runner 200cc 170cc    180 to 230cc  
Exhaust Runner          
Flow Int/Exh @

See Footnotes:
 *1  *3 and *6  *1  *1  *1
0.100    67/55      
0.200 132/102 128/104  126/105 129/112 141/107
0.300 187/131 179/140  171/133 182/139 201/143
0.400 225/150 205/156  217/162 226/166 247/175
0.500 240/164 221/166  252/179 258/178 258/190
0.600  243/162 225/170  274/188 255/186 257/200
0.700     268/? ?/187  

Manufacturer &

Head Type

Valve Size
Brodix 8 Pro

Brodix
Track 1

Holley System Max

Trick Flow
23 Deg.

Aluminum

Trick Flow
Twisted

Aluminum

Chamber Size   69cc   64cc  67
Intake Runner   215cc      190
Exhaust Runner          82
Flow Int/Exh @

See Footnotes:
 *1  *1  *1  *8  *1
0.100   60/50   51/58  
0.200 125/94 130/103 130/92 136/98 127/116
0.300 177/123 178/142 184/122 191/136 186/155
0.400 220/144 223/166 222/148 230/163 227/183
0.500 254/164 256/175 242/172 253/177 254/204
0.600 226/170 259/183 252/187  254/190 265/213
0.700          


Manufacturer &

Head Type

Valve Size

GM Fast Burn

GM Vortec L31

PN# 12558060

Cast Iron

194.150

GM L98 Vette


194.150 ?/?

GM LT4

GM LS1


2.00/1.55

Chamber Size 62cc  64cc  58cc ?   65cc 
Intake Runner 210cc 170cc      204cc 
Exhaust Runner 78cc        
Flow Int/Exh @

See Footnotes:
 *2  *6 and *7  *3  *1  *6
0.100 62/55 70/49 55/52    83/62
0.200 136/104 139/105 120/104 147/114 134/104 
0.300 187/133 190/137 160/133 197/141 189/136 
0.400 232/158 227/151 186/151 230/167 222/165 
0.500 266/180 239/160 196/170 250/180 240/179 
0.600 275/193 229/162   243/185 252/185 
0.700          

Manufacturer &

Head Type

Valve Size

GM 882

Cast-Iron

GM 441

Cast-Iron

1.94/1.50 

 GM 462

Cast-Iron

1.94/1.50

GM
LT1 372


1.94/1.50 

 
Chamber Size  76cc 76cc   62cc 56cc   
Intake Runner  151cc 155cc  156cc   170cc  
Exhaust Runner          
Flow Int/Exh @ 28 in.

See Footnotes:
 *5  *6 *6  *6   
0.100 70/58   55/45 50/54  72/53   
0.200 125/108 110/83  119/91  129/101   
0.300 175/135 160/118  167/121  180/136   
0.400 204/141 194/133  198/134  213/155   
0.500 205/142 201/146  212/139  214/165   
0.600 206/142 203/148  218/142  215/171   
0.700          
Manufacturer &

Head Type

Valve Size

 Pro Top Line
Pro Lightning 180

Iron Heads (same
casting as Alum.)
2.02/1.60 

 Pro Top Line
Pro Lightning 200

Iron Heads

2.055/1.60 

Pro Top Line
Pro Lightning 200

Alum. Heads

2.055/1.60  

GM

Vortec Bow-Tie Small Port

PN# 25534421

Cast Iron

2.00/1.55 
GM

Vortec Bow-Tie Large Port

PN# 25534431

Cast Iron

2.00/1.55  
Chamber Size  50cc/64cc/72cc  50cc/64cc/72cc   50cc/64cc/72cc  65 cc  65cc
Intake Runner  180cc 200cc   200cc  175cc 206cc 
Exhaust Runner        65cc 77cc 
Flow Int/Exh @ 28 in.

See Footnotes:
 *12 ------- *13   *13  *13  *14  *14
0.100 58/49 -----74/57 69/57  71/57  67/?  63/?
0.200 113/93 -- 151/101 134/101  146/101 136/?   134/?
0.300 163/125 - 207/157 192/157  204/157 182/?   181/?
0.400 203/151 - 243/177 236/177  250/177 223/?   227/?
0.500 231/170 - 258/186 261/186  260/186 251/?   258/?
0.600 247/177 - 263/190 269/190 269/190  240/?  255/?
0.700  247/182 - 270/194 278/195 276/195  240/?  261/? 
Manufacturer &

Head Type

Valve Size

Brodix IK180

Aluminum


2.02/1.60

Brodix IK200

Aluminum


2.02/1.60

AFR  -- LS1 Mongoose Street Head

2.02/1.60

AFR  -- LS1 Mongoose Strip Head


2.08/1.60
 
Chamber Size 64 cc or 70 cc 64 cc or 70 cc  66cc or 76cc  62cc or 72cc  
Intake Runner 180cc 200 cc  205cc (same as stock)  225cc  
Exhaust Runner ?? ??  ?? ??   
Flow Int/Exh @ 28 in.

See Footnotes:
*15 *15  *10  *10  
0.100          
0.200 138/112 123/100  140/112 150/120   
0.300 188/149 181/145 200/170  220/178   
0.400 234/167 230/164 251/203  266/220   
0.500 243/175 253/171 281/221  304/241   
0.600 245/178 261/176 298/230 320/250   
0.700          
Manufacturer &

Head Type

Valve Size

AFR

180 Eliminators


2.02/1.60

AFR

195 Eliminators


2.055/1.60

AFR

195 Eliminators



2.055/1.60 

Patriot Performance

Freedom Series SBC 23 Degree Heads

2.02/1.60

Enginequest

23 Degree Iron



2.02/1.60
Chamber Size 65 cc or 75 cc 65 cc or 75 cc  65 cc or 75 cc  64 cc  50 cc
Intake Runner 180cc 195  195  ??  180cc
Exhaust Runner ?? 80  80 ??  ?? 
Flow Int/Exh @ 28 in.

See Footnotes:
*16 *16  *17 *18  * 19
0.100      70.4/56.7  70/52  67/56
0.200 138/110 137/110  149.5/114.1 132/94  134/110 
0.300 198/158 194/158  201.2/164.9 180/127  185/140 
0.400 240/190 240/190  253.2/199.6 220/162 216/175 
0.500 260/207 270/207  280.2/217.7 244/183  237/188 
    280/211 @ .550  277/222 @.600 250/190 @.550 244/190@.600 
    286/215 @ .600   276/225 @.700 260/195@.600   


Footnotes:

*1 -- These flow numbers come from Chevy High Performance Magazine Data.

*2 -- These flow numbers come from Pace GM Parts.

*3 -- These flow numbers come from misc. sources.

*4 -- These flow numbers come from Edelbrock

*5 -- These flow numbers come from Car Craft - Jan 2001

*6 -- From Paul Shufelt

*7 -- From Chevy High Performance Feb. 2001

*8 -- From Trick Flow (Flow numbers)

*9 -- From Edelbrock's Site

*10 -- From Air Flow Research Site

*11 -- From Jim Scottt

*12 -- Chevy High Performance Feb. '04 -- Tested at Westech with SuperFlow 600 Flowbench @28-in H2O

*13 -- Pro Topline Ltd.'s Internet Site

*14 -- Super Chevy p. 39 December 2005

*15 -- Brodix Site FLOW CHART cfm @ 28" H2O

*16 -- Buy AFR Website

*17 -- Joe Sherman HOT ROD March 2007 p. 94

*18 -- Flow Figures taken on their Superflow 1020 Bench 4.060" Bore

*19 -- Popular Hot Rodding Oct. 2007 p. 92

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