Third Generation F-Body Message Boards

Tech / General Engine Is your car making a strange sound or won't start? Thinking of adding power with a new combination? Need other technical information or engine specific advice? Don't see another board for your problem? Post it here!
Sponsored by:
Sponsored by: CARiD

Flow #s for stock 305 heads?

Thread Tools
 
Search this Thread
 
Old Apr 8, 2002 | 07:14 PM
Share
  #1  
RMK's Avatar
RMK
Thread Starter
Moderator
 
Joined: Apr 2000
Posts: 2,337
Likes: 2
Car: 87 IROC
Engine: modded LB9
Transmission: Pro Built 700R4
Flow #s for stock 305 heads?
Does anyone know the flow numbers for stock 305 heads? I'm currious to see what they get.

Thanks

Rob
Reply
0
Old Apr 9, 2002 | 09:00 AM
Share
  #2  
F-BIRD'88's Avatar
F-BIRD'88
Supreme Member
 
Joined: Sep 2001
Posts: 6,111
Likes: 53
From: Ontario, Canada
Car: 1988 Firebird S/E
Engine: 406Ci Vortec SBC
Transmission: TH-350/3500stall
Axle/Gears: 7.5" Auburn 4.10 Posi-Traction
Only have the flow numbers for the "081" '87/'91
305 heads. They flow 195cfm@.500 in.(182@.400") and 110cfm@.500 ex.
Other stock 305 heads with 1.84"in and 1.5" ex valves
will flow real close to this as this is very typical.
The last set of 305 heads I ported and flowed were
"416" castings and flowed 225cfm in. and 140 ex. through
1.94x 1.60" valves.

Should give you an idea of where you're at and the potential.
Last edited by F-BIRD'88; Apr 9, 2002 at 09:04 AM.
Reply
0
Old Apr 9, 2002 | 04:06 PM
Share
  #3  
Ride4ME's Avatar
Ride4ME
Member
 
Joined: Nov 2001
Posts: 224
Likes: 0
From: Los Angeles, California
Only have the flow numbers for the "081" '87/'91
Which 305 did these come in??
Definately not my lo3 swirl ports!!
Reply
0
Old Apr 9, 2002 | 07:56 PM
Share
  #4  
RMK's Avatar
RMK
Thread Starter
Moderator
 
Joined: Apr 2000
Posts: 2,337
Likes: 2
Car: 87 IROC
Engine: modded LB9
Transmission: Pro Built 700R4
Would these be what was on my 87 LB9?
Reply
0
Old Apr 10, 2002 | 07:50 PM
Share
  #5  
F-BIRD'88's Avatar
F-BIRD'88
Supreme Member
 
Joined: Sep 2001
Posts: 6,111
Likes: 53
From: Ontario, Canada
Car: 1988 Firebird S/E
Engine: 406Ci Vortec SBC
Transmission: TH-350/3500stall
Axle/Gears: 7.5" Auburn 4.10 Posi-Traction
Originally posted by RMK
Would these be what was on my 87 LB9?
Pull a valve cover off and look.....
Reply
0
Old Apr 11, 2002 | 12:11 AM
Share
  #6  
iroc22's Avatar
iroc22
Supreme Member
 
Joined: Jan 2001
Posts: 4,415
Likes: 2
From: Surrey, BC
The 081 castings should be on your car. The 416 casting was a similar head that was used on the LG4/L69/LB9 305s (I have pulled these heads off of all these engines)
Reply
0
Old Apr 11, 2002 | 02:35 AM
Share
  #7  
Sitting Bull's Avatar
Sitting Bull
Supreme Member
 
Joined: Jun 2001
Posts: 3,238
Likes: 4
From: Calgary, Alberta, Republic of Western Canada
Car: 1986 Sport Coupé
Engine: 305-4v
Transmission: 700R4 and TransGo2
Originally posted by F-BIRD'88
Only have the flow numbers for the "081" '87/'91
305 heads. They flow 195cfm@.500 in.(182@.400") and 110cfm@.500 ex.
Other stock 305 heads with 1.84"in and 1.5" ex valves
will flow real close to this as this is very typical.
The last set of 305 heads I ported and flowed were
"416" castings and flowed 225cfm in. and 140 ex. through
1.94x 1.60" valves.

Should give you an idea of where you're at and the potential.
Those number are almost an exact match for a set of Vortec heads.
Reply
0

Trending Topics

Old Apr 11, 2002 | 05:44 PM
Share
  #8  
iroc22's Avatar
iroc22
Supreme Member
 
Joined: Jan 2001
Posts: 4,415
Likes: 2
From: Surrey, BC
Originally posted by Sitting Bull


Those number are almost an exact match for a set of Vortec heads.
The only thing is Vortec heads have a more efficient kidney shaped combustion chamber so they will make more power, even tho the flow #'s are the same.
Reply
0
Old Apr 11, 2002 | 07:27 PM
Share
  #9  
F-BIRD'88's Avatar
F-BIRD'88
Supreme Member
 
Joined: Sep 2001
Posts: 6,111
Likes: 53
From: Ontario, Canada
Car: 1988 Firebird S/E
Engine: 406Ci Vortec SBC
Transmission: TH-350/3500stall
Axle/Gears: 7.5" Auburn 4.10 Posi-Traction
Originally posted by Sitting Bull


Those number are almost an exact match for a set of Vortec heads.
The intakes were very simular but the vortec exhaust was better
unported than the "416"'s are ported.
Reply
0
Old Apr 11, 2002 | 08:02 PM
Share
  #10  
2000RATA's Avatar
2000RATA
Junior Member
 
Joined: Apr 2002
Posts: 7
Likes: 0
From: KS
Actually the Vortecs flow 240 on the intake.
Reply
0
Old Apr 11, 2002 | 08:14 PM
Share
  #11  
F-BIRD'88's Avatar
F-BIRD'88
Supreme Member
 
Joined: Sep 2001
Posts: 6,111
Likes: 53
From: Ontario, Canada
Car: 1988 Firebird S/E
Engine: 406Ci Vortec SBC
Transmission: TH-350/3500stall
Axle/Gears: 7.5" Auburn 4.10 Posi-Traction
Originally posted by 2000RATA
Actually the Vortecs flow 240 on the intake.
Mine didn't. They were 228@.500" We have gotten them over 240cfm with mild, easily done porting though.

All heads were flowed on the same bench.
Reply
0
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Blowby pressure problem at WOT - how to solve and keep the PCV system ?
Pac J
Tech / General Engine
3
May 17, 2020 10:44 AM
383 GEN I SBC Build. 500HP goal... (Can I retain the TPI Intake?)
UltRoadWarrior9
Tech / General Engine
336
Apr 28, 2020 10:39 PM
[WY] 92 Camaro
Fireslash
Camaros for Sale
3
Apr 11, 2016 06:43 PM
tpi swap, fuel system questions
dusterbd
TPI
0
Sep 29, 2015 08:40 AM
Accel runners and Edelbrock intake
toronto formula
Engine/Drivetrain/Suspension Parts for Sale
3
Sep 10, 2015 07:31 AM
Back to Subforum
Tech / General Engine
View Next Unread
Balancing a stroker




Advanced Search

All times are GMT -5. The time now is 03:45 PM.