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What now for this b1 exhaust port #2511922
06/22/18 10:06 PM
06/22/18 10:06 PM
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Posts: 28
Yakima, WA
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kevinlc Offline OP
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kevinlc  Offline OP
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Yakima, WA
Had my standard b1’s race ported by Barton many years ago and flowed them a few days ago. The exhaust only flows 250 cfm at 550 lift at 25”. Valve size is 1.785. No gain from 550 to 800 lift. 2.300 intake maxes out at 368 cfm at .700 lift at 25”. This is an all out race motor with a roller cam. Is there more flow to be gained? This 451 race motor only made 794 hp at 7300 and 599 tq at 6300. What should I do?

Re: What now for this b1 exhaust port [Re: kevinlc] #2511946
06/22/18 11:03 PM
06/22/18 11:03 PM
Joined: Aug 2011
Posts: 1,330
KATY TEXAS
csk Offline
pro stock
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That converts to @28 intake 389.5, Ex @ 28 264.6,, Take it to the track & see what it runs.

Last edited by csk; 06/22/18 11:05 PM.
Re: What now for this b1 exhaust port [Re: kevinlc] #2511956
06/22/18 11:17 PM
06/22/18 11:17 PM
Joined: Sep 2015
Posts: 1,060
Australia
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ozymaxwedge Offline
super stock
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Im no head guru but my maxed out SR's flow 368 @ .750 lift . Yours should be better or capable of being better.


1963 Plymouth Max Wedge
1971 Barracuda
Re: What now for this b1 exhaust port [Re: kevinlc] #2511976
06/22/18 11:41 PM
06/22/18 11:41 PM
Joined: Sep 2014
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Washington
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madscientist Offline
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Washington
Don't worry about the exhaust.

Don't kill yourself over flow numbers. If the valve job is correct and the port work wasn't done with a body grinder you'll be fine.


Just because you think it won't make it true. Horsepower is KING. To dispute this is stupid. C. Alston
Re: What now for this b1 exhaust port [Re: kevinlc] #2511977
06/22/18 11:41 PM
06/22/18 11:41 PM
Joined: Aug 2003
Posts: 32,278
Bend,OR USA
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Cab_Burge Offline
I Win
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Bend,OR USA
Me thinks the machine shop, flow tester, goof up something on your heads testing them tsk
I've had a bunch of different BB Mopar heads flow from bone stock 906 and 1963 M.W. heads up to several different sets of MCH CNC ported 440-1 and one set of B1 ported by Koffels. the CNC ported 440-1 with 2.250 intake valves flow right at 370 CFM at 28 inches at .700 valve lift on the intakes on a Super Flow 600 bench with a 4.375 bore and the B1 heads on the same bench with the same bore size flowed 420 CFM at .700, 430 CFM at .900 and at 1.00 lift shruggy
If I was you and wanted to learn more I would call Bob at MCH (568-468-7914) and talk to him about your heads. I'm sure Ray Barton did a decent job on your heads but I don't know what you wanted them to accomplish originally work shruggy


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: What now for this b1 exhaust port [Re: kevinlc] #2511980
06/22/18 11:47 PM
06/22/18 11:47 PM
Joined: May 2003
Posts: 5,232
Downtown Roebuck Ont
Twostick Offline
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Who flows heads at 25"?

Kevin

Re: What now for this b1 exhaust port [Re: Twostick] #2511987
06/23/18 12:07 AM
06/23/18 12:07 AM
Joined: Mar 2012
Posts: 28
Yakima, WA
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kevinlc Offline OP
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Yakima, WA
Local mopar racer. Says it’s makes more realistic numbers. Didn’t know this till I picked them up. Anyway, this motor should make more power buts it’s not. The 68 dart only runs 9.90 at 137 mph at 3100 lbs

Re: What now for this b1 exhaust port [Re: Twostick] #2511988
06/23/18 12:07 AM
06/23/18 12:07 AM
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Washington
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madscientist Offline
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Originally Posted By Twostick
Who flows heads at 25"?

Kevin


Many do. That's why I said don't get ate up over flow numbers.

It's not like Barton is stupid.


Just because you think it won't make it true. Horsepower is KING. To dispute this is stupid. C. Alston
Re: What now for this b1 exhaust port [Re: kevinlc] #2511996
06/23/18 12:26 AM
06/23/18 12:26 AM
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Posts: 14,081
PA.
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pittsburghracer Offline
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Originally Posted By kevinlc
Local mopar racer. Says it’s makes more realistic numbers. Didn’t know this till I picked them up. Anyway, this motor should make more power buts it’s not. The 68 dart only runs 9.90 at 137 mph at 3100 lbs



That’s pathetic. Something wrong big time with that combo.


1970 Duster
Edelbrock headed 408
6.143@110.85 mph
9.73@135.05 mph shifting at 6700 RPM
422 Indy headed small block
5.982@112.56 mph
9.42@138.27

Livin and lovin life one day at a time




Re: What now for this b1 exhaust port [Re: pittsburghracer] #2512033
06/23/18 02:26 AM
06/23/18 02:26 AM
Joined: Jan 2008
Posts: 2,190
Cotati, CA
Dave Hall Online content
top fuel
Dave Hall  Online Content
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Cotati, CA
iagree The combo is off if it really makes 800. What are the short times from your Dart?

Re: What now for this b1 exhaust port [Re: kevinlc] #2512079
06/23/18 10:32 AM
06/23/18 10:32 AM
Joined: Jan 2003
Posts: 11,737
So. Burlington, Vt.
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fast68plymouth Offline
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I doubt a 451 with B1 heads in a 3100lb car needs the heads to be any “bigger”(more porting).

I’m not sure if this is still the case, but SuperFlow used to have their flow benches calibrated at 25”, so some shops used that as the test pressure.


68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads
Re: What now for this b1 exhaust port [Re: kevinlc] #2512097
06/23/18 11:30 AM
06/23/18 11:30 AM
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Posts: 14,445
Valhalla... eventually
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BradH Offline
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Valhalla... eventually
Originally Posted By kevinlc
Had my standard b1’s race ported by Barton many years ago and flowed them a few days ago. The exhaust only flows 250 cfm at 550 lift at 25”. Valve size is 1.785. No gain from 550 to 800 lift. 2.300 intake maxes out at 368 cfm at .700 lift at 25”. This is an all out race motor with a roller cam. Is there more flow to be gained? This 451 race motor only made 794 hp at 7300 and 599 tq at 6300. What should I do?

Start by putting a 4.25"-stroke crank in it to make better use of those big ports.


Testing... testing... 1... 2... 3...
Re: What now for this b1 exhaust port [Re: kevinlc] #2512120
06/23/18 12:14 PM
06/23/18 12:14 PM
Joined: Jun 2004
Posts: 281
Memphis TN
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B1HEAD_USER Offline
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Memphis TN
I'd like to see more about the combo. What cam and compression, transmission converter and gear?

Re: What now for this b1 exhaust port [Re: B1HEAD_USER] #2512236
06/23/18 04:50 PM
06/23/18 04:50 PM
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Posts: 28
Yakima, WA
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kevinlc Offline OP
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Yakima, WA
The combination is a 15:1 451 cid with b1 original heads, sheet metal intake with two 1050’s, roller cam with .845 intake 285 duration and .766 exhaust and 299 duration ground on 110 lobe separation. Exhaust is 2 to 2/18 equal length. Trans is a 727 with a brake, 5500 stall, 14x32 and 5:13 gears. With the exhaust limit of .550 lift, I think the two dominators are killing the motor.

Re: What now for this b1 exhaust port [Re: kevinlc] #2512240
06/23/18 05:06 PM
06/23/18 05:06 PM
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Posts: 737
MD
HEMI472 Offline
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did barton do the whole motor ???

Re: What now for this b1 exhaust port [Re: HEMI472] #2512248
06/23/18 05:30 PM
06/23/18 05:30 PM
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Yakima, WA
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kevinlc Offline OP
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Yes and dynoed it also
Max hp is 794 at 7300
Tq is 599 at 6300

Re: What now for this b1 exhaust port [Re: kevinlc] #2512284
06/23/18 07:45 PM
06/23/18 07:45 PM
Joined: Mar 2006
Posts: 7,476
MI, usa
dvw Offline
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I think the converter is the issue. I run way more stall speed and less cam in my 572, 6100 flash stall. That is a lot of cam for a small motor. With the right converter that thing should run pretty decent. I'm sure with that cam and heads it would be even better on a 528/540 short block.
Doug

Last edited by dvw; 06/23/18 09:39 PM.
Re: What now for this b1 exhaust port [Re: kevinlc] #2512314
06/23/18 09:19 PM
06/23/18 09:19 PM
Joined: Jan 2003
Posts: 11,737
So. Burlington, Vt.
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fast68plymouth Offline
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Originally Posted By kevinlc
Yes and dynoed it also
Max hp is 794 at 7300
Tq is 599 at 6300


Motor makes peak tq at 6300........ and you have a 5500 converter.
That’s the first thing I’d be addressing.


68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads
Re: What now for this b1 exhaust port [Re: fast68plymouth] #2512343
06/23/18 10:53 PM
06/23/18 10:53 PM
Joined: Mar 2012
Posts: 28
Yakima, WA
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kevinlc Offline OP
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Converter probably is 6000. I sent the dyno sheet to the company

Re: What now for this b1 exhaust port [Re: kevinlc] #2512562
06/24/18 01:16 PM
06/24/18 01:16 PM
Joined: May 2005
Posts: 784
Apollo, PA.
B1MAXX Offline
super stock
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do you have a way to see the flash during a run and what it rpm's at the shifts? I have a play back box on my tach which was great for this. That will show what the converter is doing.

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