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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 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 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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