Re: head swap to B1 BS HP gain?
[Re: blownzoom440]
#574107
01/08/10 11:02 PM
01/08/10 11:02 PM
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Joined: Oct 2003
Posts: 3,698 NE Oklahoma
Von
master
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master
Joined: Oct 2003
Posts: 3,698
NE Oklahoma
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Quote:
thanks guys.i am going from iron 346 flowing 280 at .600 and the BS are said to flow 330+ at that.these heads will give me plenty of room to grow and be repairable.any1 know what the cnc ported heads flow?
Who ported your heads?
Dwayne ported mine and they go 325 @.600.
BTW, the out of the box numbers are junk on the BS heads. OOTB, the low and mid lift numbers are horrible.......to say the least.
I think Scott Brown used have flow figures on his website of some CNC'ed BS heads. I think they were close to 350 at .600.
72 RR, Pump gas 440, 452s, 3800 lbs, Corked, ET Radials,. 11.33@117.72.
Same car, bone stock 346s, 9.5 comp, baby solid. 12.24@110.
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Re: head swap to B1 BS HP gain?
[Re: montessa]
#574110
01/08/10 11:43 PM
01/08/10 11:43 PM
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Joined: Jul 2005
Posts: 8,647 ELYRIA,OH
blownzoom440
OP
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OP
Joined: Jul 2005
Posts: 8,647
ELYRIA,OH
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what was your MPH? who did the dyno? that is a good running combo!
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Re: head swap to B1 BS HP gain?
[Re: blownzoom440]
#574111
01/09/10 01:11 AM
01/09/10 01:11 AM
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Joined: Oct 2003
Posts: 3,698 NE Oklahoma
Von
master
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master
Joined: Oct 2003
Posts: 3,698
NE Oklahoma
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[quoteand said it would flow that.i think the cnc flows more than 350cfm no? i w2ish the low flow was better.it would help me more i think.[446 cubes,.646 lift roller,6500/6800rpm] this info some1 else posted.
I'll put it this way, with only bowl work, they wouldnt flow 330 on Dwaynes bench, Id bet the house on that!!!
Honestly I was surprised they got 350 out of a CNC ported BS. I dont think they will go much more than that. Yeah, I know somebodys cousin had a set that flowed 3XX, see the last paragraph below.
I'll also add that Dwayne did another set of BS heads a week or so before he did mine. They were MW size and didnt flow more than mine at standard port window. Im wanting to say the flow was within 2-3 cfm, honestly I think it was closer than that. I know somebody will tell you the MW version will be the cats meow, but Dwayne was positive that unless you need the bigger intake, its not worth it to go MW on these heads.
Further, I had the heads flowed on a local bench. They flowed almost 340 at .700. I didnt pay much attention to that number, since so many heads on here have come from Dwayne, been flowed on his bench, we know what they run, etc.
Last edited by Von; 01/09/10 01:23 AM.
72 RR, Pump gas 440, 452s, 3800 lbs, Corked, ET Radials,. 11.33@117.72.
Same car, bone stock 346s, 9.5 comp, baby solid. 12.24@110.
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Re: head swap to B1 BS HP gain?
[Re: blownzoom440]
#574114
01/09/10 10:41 AM
01/09/10 10:41 AM
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Joined: Feb 2005
Posts: 20,188 PA.
pittsburghracer
"Little"John
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"Little"John
Joined: Feb 2005
Posts: 20,188
PA.
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Tom Hemphill has produced excellent numbers with B1-BS heads. My friends 68 charger (2800-2900 pounds)has gone as fast as 8.60's with 500 inch engine. These heads have to be opened up to max wedge size to make good numbers. I wish I could post some pictures of his car but the cars name is Tims Toy.
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
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Re: head swap to B1 BS HP gain?
[Re: blownzoom440]
#574118
01/09/10 12:18 PM
01/09/10 12:18 PM
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Joined: Jan 2003
Posts: 4,074 Shelby Twp. Mi
HardcoreB
master
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master
Joined: Jan 2003
Posts: 4,074
Shelby Twp. Mi
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Quote:
ported or just cleanedup what did you gain in HP,ET or MPH.you can list your combo if you like but i am just lookinfg for results. Thanks for any info.
As stated already the chambers are small. Can I assume that you will have to open the chambers to acheive your desired C/R? Off the top of my head the chambers have a good amount of "unnecessary" material. Which will cater to your advantage for flow increase. I want to say you can acheive 76+cc in an unmilled head while only sacrificing C/R.$$$
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Re: head swap to B1 BS HP gain?
[Re: HardcoreB]
#574120
01/09/10 12:57 PM
01/09/10 12:57 PM
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Joined: Oct 2003
Posts: 3,698 NE Oklahoma
Von
master
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master
Joined: Oct 2003
Posts: 3,698
NE Oklahoma
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[quoteI want to say you can acheive 76+cc in an unmilled head while only sacrificing C/R.$$$
My heads were opened up to 69.7 before milling.
72 RR, Pump gas 440, 452s, 3800 lbs, Corked, ET Radials,. 11.33@117.72.
Same car, bone stock 346s, 9.5 comp, baby solid. 12.24@110.
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