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Flow Numbers for Stock Small Block Heads #1756575 02/17/15 12:46 PM 02/17/15 12:46 PM
Joined: Mar 2013 Posts: 144 Western Ohio - formerly Southe... H hemid68 OP member
hemid68 OP member H Joined: Mar 2013 Posts: 144 Western Ohio - formerly Southe...	I'm taking a class in High Performance Engine Machining at Sinclair Comm. College in Dayton, OH. I had a set of 576 casting small block heads that I just did a valve job on, and then put them on the flow bench, just to see what they would flow stock. They were 206 on the intake, and 166 on the exhaust side, both at .600 lift. Is that within a good range? So I just wondered if anybody else has flowed some small block heads, and what they came up with. I know they talk about the X heads are supposed to be good, and the 308's, but does anybody have any numbers? Just curious. Thanks, Dan

Re: Flow Numbers for Stock Small Block Heads [Re: hemid68] #1756576 02/17/15 03:02 PM 02/17/15 03:02 PM
Joined: Jan 2004 Posts: 755 Tempe, AZ L loco340cuda super stock
loco340cuda super stock L Joined: Jan 2004 Posts: 755 Tempe, AZ	Shady Dell Speed Shop has flow numbers on their website. Here is a link to their website which shows the flow numbers for a J-head: http://www.shadydellspeedshop.com/jhead.htm You can find other flow numbers for other heads on their site as well. 70 Cuda 340 4 speed - now stroked to 416ci (SOLD) 2017 Mustang Shelby GT350

Re: Flow Numbers for Stock Small Block Heads [Re: loco340cuda] #1756577 02/17/15 04:10 PM 02/17/15 04:10 PM
Joined: Feb 2005 Posts: 20,174 PA. pittsburghracer "Little"John
pittsburghracer "Little"John Joined: Feb 2005 Posts: 20,174 PA.	This site comes in handy too. http://users.erols.com/srweiss/tablehdc.htm#Chrysler 1970 Duster Edelbrock headed 408 5.984@112.52 422 Indy headed small block 5.982@112.56 mph 9.42@138.27 Livin and lovin life one day at a time

Re: Flow Numbers for Stock Small Block Heads [Re: hemid68] #1756578 02/17/15 04:21 PM 02/17/15 04:21 PM
Joined: Mar 2008 Posts: 883 Affton MO Q qwkmopardan super stock
qwkmopardan super stock Q Joined: Mar 2008 Posts: 883 Affton MO	Your results are right on. I have flowed them stock and that is about exact. I will go through the data sheets later today and update. Now start porting and see where they end up. On a good port job I get 275 intake and 210 exhaust.

Re: Flow Numbers for Stock Small Block Heads [Re: qwkmopardan] #1756579 02/17/15 08:06 PM 02/17/15 08:06 PM
Joined: Sep 2007 Posts: 67 Walhalla, SC BlueDart member
BlueDart member Joined: Sep 2007 Posts: 67 Walhalla, SC	That's about what I flowed a virgin x head at if I remember they quit @.450

Re: Flow Numbers for Stock Small Block Heads [Re: BlueDart] #1756580 02/18/15 05:37 AM 02/18/15 05:37 AM
Joined: Sep 2010 Posts: 170 renton , washington P perfmachst member
perfmachst member P Joined: Sep 2010 Posts: 170 renton , washington	Quote: That's about what I flowed a virgin x head at if I remember they quit @.450 I've flowed many stock small block heads, all drop off above .475 lift. my bench flows at 25 " test pressure. this is mopar, chev and ford heads. higher test pressure gives higher flow numbers,

Re: Flow Numbers for Stock Small Block Heads [Re: perfmachst] #1756581 02/19/15 01:32 AM 02/19/15 01:32 AM
Joined: Mar 2013 Posts: 144 Western Ohio - formerly Southe... H hemid68 OP member
hemid68 OP member H Joined: Mar 2013 Posts: 144 Western Ohio - formerly Southe...	Thanks to all of you guys that replied. It was nice to know that everything seems to be on the up and up. The heads are going on a "stocker" style engine, so I can't do any porting, but it is good just to know where they're at. The information was greatly appreciated! Thanks again, Dan

Re: Flow Numbers for Stock Small Block Heads [Re: hemid68] #1756582 02/19/15 10:54 AM 02/19/15 10:54 AM
Joined: Jan 2003 Posts: 3,103 Phila Pa S scatpacktom master
scatpacktom master S Joined: Jan 2003 Posts: 3,103 Phila Pa	Quote: Thanks to all of you guys that replied. It was nice to know that everything seems to be on the up and up. The heads are going on a "stocker" style engine, so I can't do any porting, but it is good just to know where they're at. The information was greatly appreciated! Thanks again, Dan You are right about that, no porting allowed but make sure the valve job goes all the way to the intake plenum.

Re: Flow Numbers for Stock Small Block Heads [Re: scatpacktom] #1756583 02/19/15 01:16 PM 02/19/15 01:16 PM
Joined: Jan 2003 Posts: 3,504 DFW M mr_340 master
mr_340 master M Joined: Jan 2003 Posts: 3,504 DFW	I put a post on Classracer about how far the VJ could go into the pocket, but never got an answer from anyone. I was thinking that it could go up to the bottom of the guide, or maybe a bit further? The thinking there seemed to be anything goes as long as it is radially symmetric off the guide centerline (same distance all the way around).

Re: Flow Numbers for Stock Small Block Heads [Re: mr_340] #1756584 02/19/15 02:21 PM 02/19/15 02:21 PM
Joined: Jan 2003 Posts: 2,155 Tucson, Arizona clonestocker top fuel
clonestocker top fuel Joined: Jan 2003 Posts: 2,155 Tucson, Arizona	Quote: I put a post on Classracer about how far the VJ could go into the pocket, but never got an answer from anyone. I was thinking that it could go up to the bottom of the guide, or maybe a bit further? The thinking there seemed to be anything goes as long as it is radially symmetric off the guide centerline (same distance all the way around). You can pay big bucks for a stock eliminator valve job [img] [/img]

Re: Flow Numbers for Stock Small Block Heads [Re: clonestocker] #1756585 02/19/15 03:09 PM 02/19/15 03:09 PM
Joined: Jan 2003 Posts: 5,894 Florida Locomotion master
Locomotion master Joined: Jan 2003 Posts: 5,894 Florida	It's a lot of work, but most accurate comparisons are when different heads are flowed on the same bench. 360's had a factory cut that went down into the bowl, but apparently everyone is allowed to do that now, as mentioned, cut off of the guide. Different angles and valve designs can change results as well.

Re: Flow Numbers for Stock Small Block Heads [Re: Locomotion] #1756586 02/19/15 04:02 PM 02/19/15 04:02 PM
Joined: Jan 2003 Posts: 2,155 Tucson, Arizona clonestocker top fuel
clonestocker top fuel Joined: Jan 2003 Posts: 2,155 Tucson, Arizona	Quote: It's a lot of work, but most accurate comparisons are when different heads are flowed on the same bench. 360's had a factory cut that went down into the bowl, but apparently everyone is allowed to do that now, as mentioned, cut off of the guide. Different angles and valve designs can change results as well. When I built my stocker my heads were done by the late Don Studley. My Aspen Wagon went .885 under first day at the track. Car is now in Vegas leading an awesome race life. Myron, Been following you since you were driving the Locomotion Challenger. You career has been awesome in Crate Motor also. matt [img] [/img]

Re: Flow Numbers for Stock Small Block Heads [Re: clonestocker] #1756587 02/20/15 04:26 PM 02/20/15 04:26 PM
Joined: Jan 2003 Posts: 3,504 DFW M mr_340 master
mr_340 master M Joined: Jan 2003 Posts: 3,504 DFW	I was thinking of buying the tooling from Goodson or Regis to do guides and a Serdi style cutter I can use in my mill. I'd have to build a flow bench too. I'm sure there is a lot of testing to do with various cuts. I've seen stocker heads run $3-4k and up, so that would pay for the tooling. I have more time than money these days.

Re: Flow Numbers for Stock Small Block Heads [Re: mr_340] #1756588 02/21/15 09:11 PM 02/21/15 09:11 PM
Joined: Jan 2003 Posts: 3,103 Phila Pa S scatpacktom master
scatpacktom master S Joined: Jan 2003 Posts: 3,103 Phila Pa	Stocker heads are hundreds of dollars "porting" and thousands of dollars "hiding"

Re: Flow Numbers for Stock Small Block Heads [Re: hemid68] #1756589 03/01/15 02:31 AM 03/01/15 02:31 AM
Joined: Jan 2003 Posts: 1,760 Windsor, ON, Canada D Diplomat360 top fuel
Diplomat360 top fuel D Joined: Jan 2003 Posts: 1,760 Windsor, ON, Canada	Here are my numbers, a result of DYI home porting job using the MP SwirlHead porting templates: 596 castings, I had the machine shop go over them, they put in new Manley severe duty valves, 2.02/1.60, 11/32 stem, new bronze guides, and a standard 3 angle valve job. I ported them using the MP porting templates, here are the flow numbers (flowed on SF-600 @ 28" water): LIFT I E 0.100 67 57 0.150 99 79 0.200 130 104 0.250 162 125 0.300 189 140 0.350 215 152 0.400 235 160 0.450 253 167 0.500 262 172 0.550 261 175 0.600 248 177

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