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head flow-hp #1377229 01/27/13 07:37 PM 01/27/13 07:37 PM
Joined: Dec 2008 Posts: 1,285 okla. sam64 OP pro stock
sam64 OP pro stock Joined: Dec 2008 Posts: 1,285 okla.	on a 470bb with a mp .590 solid,11.1 comp.,how much hp difference from a head that flows 290@.600 vs 315@.600?thanks,sam.

Re: head flow-hp [Re: sam64] #1377230 01/27/13 08:00 PM 01/27/13 08:00 PM
Joined: Feb 2005 Posts: 20,173 PA. pittsburghracer "Little"John
pittsburghracer "Little"John Joined: Feb 2005 Posts: 20,173 PA.	Quote: on a 470bb with a mp .590 solid,11.1 comp.,how much hp difference from a head that flows [Email]290@.600[/Email] vs [Email]315@.600?thanks[/Email],sam. There is not a real simple answer to that question. By the time you subtract valve lash, pushrod deflection, and a few other factors your 590 lift cam is not 590. When porting a set of heads they should be customized to match the customers combo. It is real easy to reach for that high flow number only to have mid lift numbers and air-speed suffers. Most guys use the simple factor of 2hp per 1 cfm but a lot of things come into play. 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: head flow-hp [Re: pittsburghracer] #1377231 01/27/13 08:39 PM 01/27/13 08:39 PM
Joined: Dec 2008 Posts: 1,285 okla. sam64 OP pro stock
sam64 OP pro stock Joined: Dec 2008 Posts: 1,285 okla.	that's why i'm asking,i don't see anyone advertising a hand or cnc port for x amount of cam.i guess i should have asked if it would be worth the change from 290 to 315.i'm not dwelling on big numbers just wandering if it's worth the extra$ to have heads ported.thanks,sam.

Re: head flow-hp [Re: sam64] #1377232 01/27/13 09:27 PM 01/27/13 09:27 PM
Joined: Feb 2005 Posts: 20,173 PA. pittsburghracer "Little"John
pittsburghracer "Little"John Joined: Feb 2005 Posts: 20,173 PA.	Quote: that's why i'm asking,i don't see anyone advertising a hand or cnc port for x amount of cam.i guess i should have asked if it would be worth the change from 290 to 315.i'm not dwelling on big numbers just wandering if it's worth the extra$ to have heads ported.thanks,sam. Did you have your heads checked or are you going by advertized flow numbers? I've never had a set of heads on my bench yet that have matched their advertized numbers. Numbers sell and high number sell more. It takes me about 3 minutes to check calibration on my bench and every set of heads I do I show a customer before and after numbers. If you have someone port the heads, please have him do the intake manifold to. Its a shame to have a nice set of ported heads and choke the numbers back down with a stock intake. I don't want to trash your thread but if you want I can pm you some numbers on a set of chevy dart platinum 215 heads and before and after numbers with a stock victor jr, intake and a ported one. You won't believe the difference. 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: head flow-hp [Re: sam64] #1377233 01/27/13 10:15 PM 01/27/13 10:15 PM
Joined: Aug 2003 Posts: 43,161 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,161 Bend,OR USA	My pump gas Duster gained a little over.2 ET and 4 mph by swapping from a set of ported big valve 906 heads that flowed 266 CFM at .600 lift to a set of CNC ported Eddy RPM that flowed 310 CFM at .600 on the same bench by the same tech Both sets of heads had the exact same size combustion chambers so the compression ratio stayed the same I change the crankshaft stroke by .050(4.250 to 4.300 ) to raise the pistons up the next winter, went from 9.25 to 1 to 10.29 to 1 and the car picked up another .18 ET and .5 MPH the car did have a fuel delivery problem back then, it picked up a tiny bit more when I corrected that, fuel filter between the fuel pump and fuel tank was a 10 micron element It was restricting the fuel inlet side of the pump so it would run out of fuel slowly the last 500 Ft in the 1/4 I couldn't fatten the jetting up enough to slow the car MPH down in the 1/4 mile , once I swapped that filter out to a 80 micron unit the car slowed down with the bigger jets I was close to perfect on the six pak jetting the first time so it ended up being jetted back down there BTW, I ended up swapping the ported Eddy RPM to a set of Indy M.W. port size SR heads (that flowed 30 CFM more than the Eddy heads did) with the Indy matching Dominator intake and carb. and the dang car became to fast for the tech. officials, 9.94 ET at 134,8 MPH It is legal to run ten flat That car has been very fun to build and drive, now its time for a new one that is built to go faster legally so I can learn some more about chassis tuning Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: head flow-hp [Re: Cab_Burge] #1377234 01/28/13 03:14 AM 01/28/13 03:14 AM
Joined: Jun 2007 Posts: 103 NEW JERSEY BIGSPEED member
BIGSPEED member Joined: Jun 2007 Posts: 103 NEW JERSEY	We use 2.4 HP per 1 cfm of flow,That is potential available.Bill C. Ceralli Racing Engines & Checkered Flag Machine Racing engines , CNC porting & induction development http://www.checkeredflagmachine.net/

Re: head flow-hp [Re: BIGSPEED] #1377235 01/28/13 03:29 AM 01/28/13 03:29 AM
Joined: Jun 2003 Posts: 9,225 Charleston S sixpackgut Drag Week Mod Champion
sixpackgut Drag Week Mod Champion S Joined: Jun 2003 Posts: 9,225 Charleston	I would compare the .550 numbers Gen 3 power 6.22@110, 9.85@135 Follow @g3hemiswap on instagram performance only racing, CRT, ultimate converter, superior design concepts, ThumperCarbs

Re: head flow-hp [Re: sixpackgut] #1377236 01/28/13 10:02 AM 01/28/13 10:02 AM
Joined: Aug 2006 Posts: 2,141 junction city oregon V viperblue72 top fuel
viperblue72 top fuel V Joined: Aug 2006 Posts: 2,141 junction city oregon	Is it worth it to have your heads ported? YES!!!!!

Re: head flow-hp [Re: pittsburghracer] #1377237 01/28/13 10:05 AM 01/28/13 10:05 AM
Joined: Jan 2003 Posts: 25,920 United Socialist States of Ame... T tboomer Too Many Posts
tboomer Too Many Posts T Joined: Jan 2003 Posts: 25,920 United Socialist States of Ame...	Quote: There is not a real simple answer to that question. By the time you subtract valve lash, pushrod deflection, and a few other factors your 590 lift cam is not 590. When porting a set of heads they should be customized to match the customers combo. It is real easy to reach for that high flow number only to have mid lift numbers and air-speed suffers. Most guys use the simple factor of 2hp per 1 cfm but a lot of things come into play. Need your rear end checked out? Contact Grizzly!!

Re: head flow-hp [Re: sam64] #1377238 01/29/13 12:47 PM 01/29/13 12:47 PM
Joined: Jan 2013 Posts: 167 maryland 7 74yellowduster member
74yellowduster member 7 Joined: Jan 2013 Posts: 167 maryland	Quote: on a 470bb with a mp .590 solid,11.1 comp.,how much hp difference from a head that flows [Email]290@.600[/Email] vs [Email]315@.600?thanks[/Email],sam. hmmm... i wouldnt recommend pulling heads just to do a port job... are they irons? what heads? what i would do, is shop around, lurk the boards find a top end for sale / heads intake get offsets on them... heads ported at the same time. so your .590 lift becomes .630 and you have fresh springs/valves etc ready to go. that would make a big difference. also if you go from 11.12 down to 10 something you may need to do some other work to stay legal. you could do some lightening as well and you will be down in the 10's do it as an upgrade package... that way you can keep racing as you lurk and gather parts, and you will notice a much bigger change. just taking your current heads off and having them ported and putting them back on is a ton of work & downtime with not as much return on your dollar if you already have alum heads you could resell those

Re: head flow-hp [Re: pittsburghracer] #1377239 01/29/13 02:20 PM 01/29/13 02:20 PM
Joined: Feb 2003 Posts: 12,675 Columbia, CT M moper I Live Here
moper I Live Here M Joined: Feb 2003 Posts: 12,675 Columbia, CT	Quote: Quote: on a 470bb with a mp .590 solid,11.1 comp.,how much hp difference from a head that flows [Email]290@.600[/Email] vs [Email]315@.600?thanks[/Email],sam. There is not a real simple answer to that question. By the time you subtract valve lash, pushrod deflection, and a few other factors your 590 lift cam is not 590. When porting a set of heads they should be customized to match the customers combo. It is real easy to reach for that high flow number only to have mid lift numbers and air-speed suffers. Most guys use the simple factor of 2hp per 1 cfm but a lot of things come into play. x3 Well, art is art, isn't it? Still, on the other hand, water is water! And east is east and west is west and if you take cranberries and stew them like applesauce they taste much more like prunes than rhubarb does. Now, uh... Now you tell me what you know.

Re: head flow-hp [Re: 74yellowduster] #1377240 01/29/13 03:06 PM 01/29/13 03:06 PM
Joined: Dec 2008 Posts: 1,285 okla. sam64 OP pro stock
sam64 OP pro stock Joined: Dec 2008 Posts: 1,285 okla.	Quote: Quote: on a 470bb with a mp .590 solid,11.1 comp.,how much hp difference from a head that flows [Email]290@.600[/Email] vs [Email]315@.600?thanks[/Email],sam. hmmm... i wouldnt recommend pulling heads just to do a port job... are they irons? what heads? what i would do, is shop around, lurk the boards find a top end for sale / heads intake get offsets on them... heads ported at the same time. so your .590 lift becomes .630 and you have fresh springs/valves etc ready to go. that would make a big difference. also if you go from 11.12 down to 10 something you may need to do some other work to stay legal. you could do some lightening as well and you will be down in the 10's do it as an upgrade package... that way you can keep racing as you lurk and gather parts, and you will notice a much bigger change. just taking your current heads off and having them ported and putting them back on is a ton of work & downtime with not as much return on your dollar if you already have alum heads you could resell those the motor is a new build to replace the grenaded 440,the heads are the mopar eddies that came off the 440,been touched up not ported,car weighes 3250 race ready.probably run them as is this year,only 4 weeks till track opens.

Re: head flow-hp [Re: sam64] #1377241 01/29/13 03:34 PM 01/29/13 03:34 PM
Joined: Aug 2003 Posts: 43,161 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,161 Bend,OR USA	My first set of Eddy RPM flowed 288 CFM at .600 on the intake on one head and 286 on another intake port on the other head on a Super Flow 600 bench at 28. inches of water. I sent them to Jeff at Modern Cylinder heads for his CNC port job, they flowed 317 at .600 on his bench and 310 on the same Super Flow bench as before. I'm sure those heads made close to 60 HP more on the motor, I ended up swapping the old rocker arms out, Chinese brand 1.6 ratio CAT aluminum roller rockers with 1.52 actual ratio to a set of Harland Sharp full roller rockers that are 1.6 ratio advertised ratio that are 1.65 actual ratio at the retainers My Duster picked up right at 4 MPH(124.5 to 128.6) and close to .25 ET (10.69 to 10.43)in the 1/4 mile with the new heads and rockers I built a bracket 470 C.I. 440 motor for a customer and freind four years ago that had a set of B1-BS heads that I had Jeff at MCH CNC port to M.W. size, they flowed 350 CFM at .600 and a little more at .700 and .800. That motor had right at 12.8 to 1 compression ratio and made 720 HP at 7000 RPM with a used M.W. port sizes sheet metal tunnel ram with two Holley 750 D.P. carbs on it The cam was a custom grind Crane solid rolleer that had symetrical lobes, 273 at .050 and .430 lobe lifts, gold Crane 1.5 extruded aluminum rockers with roller tips.IHTHs Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

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