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#2511922 - 06/22/18 08:06 PM What now for this b1 exhaust port
kevinlc Offline
member

Registered: 03/13/12
Posts: 27
Loc: 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?

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#2511946 - 06/22/18 09:03 PM Re: What now for this b1 exhaust port [Re: kevinlc]
csk Online   work
super stock

Registered: 08/13/11
Posts: 1141
Loc: KATY TEXAS
That converts to @28 intake 389.5, Ex @ 28 264.6,, Take it to the track & see what it runs.


Edited by csk (06/22/18 09:05 PM)
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#2511956 - 06/22/18 09:17 PM Re: What now for this b1 exhaust port [Re: kevinlc]
ozymaxwedge Offline
super stock

Registered: 09/04/15
Posts: 1013
Loc: Australia
Im no head guru but my maxed out SR's flow 368 @ .750 lift . Yours should be better or capable of being better.
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1963 Plymouth Max Wedge
1971 Barracuda

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#2511976 - 06/22/18 09:41 PM Re: What now for this b1 exhaust port [Re: kevinlc]
madscientist Offline


Registered: 09/17/14
Posts: 2206
Loc: 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.
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Just because you think it won't make it true. Horsepower is KING. To dispute this is stupid. C. Alston

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#2511977 - 06/22/18 09:41 PM Re: What now for this b1 exhaust port [Re: kevinlc]
Cab_Burge Offline
I Win

Registered: 08/23/03
Posts: 31226
Loc: 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
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#2511980 - 06/22/18 09:47 PM Re: What now for this b1 exhaust port [Re: kevinlc]
Twostick Offline
master

Registered: 05/20/03
Posts: 4984
Loc: Downtown Roebuck Ont
Who flows heads at 25"?

Kevin

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#2511987 - 06/22/18 10:07 PM Re: What now for this b1 exhaust port [Re: Twostick]
kevinlc Offline
member

Registered: 03/13/12
Posts: 27
Loc: 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

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#2511988 - 06/22/18 10:07 PM Re: What now for this b1 exhaust port [Re: Twostick]
madscientist Offline


Registered: 09/17/14
Posts: 2206
Loc: Washington
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

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#2511996 - 06/22/18 10:26 PM Re: What now for this b1 exhaust port [Re: kevinlc]
pittsburghracer Online   work
Slowride

Registered: 02/02/05
Posts: 13335
Loc: PA.
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.
_________________________
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Edelbrock headed 408
6.143@110.89 mph
9.73@135.05 mph shifting at 6700 RPM
422 Indy headed small block
6.001@113.27mph
9.44@138.23

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#2512033 - 06/23/18 12:26 AM Re: What now for this b1 exhaust port [Re: pittsburghracer]
Dave Hall Offline
top fuel

Registered: 01/21/08
Posts: 1956
Loc: Cotati, CA
iagree The combo is off if it really makes 800. What are the short times from your Dart?

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#2512079 - 06/23/18 08:32 AM Re: What now for this b1 exhaust port [Re: kevinlc]
fast68plymouth Offline
I Live Here

Registered: 01/20/03
Posts: 11223
Loc: So. Burlington, Vt.
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 Plymouth Satellite, 383, stock 906's, 3550lbs, 11.18 @ 123, 1.51 60'
WD- Comp Cams / Indy Cylinder Heads

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#2512097 - 06/23/18 09:30 AM Re: What now for this b1 exhaust port [Re: kevinlc]
BradH Online   content
I Live Here

Registered: 01/30/03
Posts: 13942
Loc: 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.

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#2512120 - 06/23/18 10:14 AM Re: What now for this b1 exhaust port [Re: kevinlc]
B1HEAD_USER Offline
enthusiast

Registered: 06/21/04
Posts: 281
Loc: Memphis TN
I'd like to see more about the combo. What cam and compression, transmission converter and gear?

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#2512236 - 06/23/18 02:50 PM Re: What now for this b1 exhaust port [Re: B1HEAD_USER]
kevinlc Offline
member

Registered: 03/13/12
Posts: 27
Loc: 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.

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#2512240 - 06/23/18 03:06 PM Re: What now for this b1 exhaust port [Re: kevinlc]
HEMI472 Offline
super stock

Registered: 03/12/04
Posts: 728
Loc: MD
did barton do the whole motor ???

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#2512248 - 06/23/18 03:30 PM Re: What now for this b1 exhaust port [Re: HEMI472]
kevinlc Offline
member

Registered: 03/13/12
Posts: 27
Loc: Yakima, WA
Yes and dynoed it also
Max hp is 794 at 7300
Tq is 599 at 6300

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#2512284 - 06/23/18 05:45 PM Re: What now for this b1 exhaust port [Re: kevinlc]
dvw Offline
master

Registered: 03/16/06
Posts: 7124
Loc: MI, usa
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


Edited by dvw (06/23/18 07:39 PM)

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#2512314 - 06/23/18 07:19 PM Re: What now for this b1 exhaust port [Re: kevinlc]
fast68plymouth Offline
I Live Here

Registered: 01/20/03
Posts: 11223
Loc: So. Burlington, Vt.
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 Plymouth Satellite, 383, stock 906's, 3550lbs, 11.18 @ 123, 1.51 60'
WD- Comp Cams / Indy Cylinder Heads

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#2512343 - 06/23/18 08:53 PM Re: What now for this b1 exhaust port [Re: fast68plymouth]
kevinlc Offline
member

Registered: 03/13/12
Posts: 27
Loc: Yakima, WA
Converter probably is 6000. I sent the dyno sheet to the company

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#2512562 - 06/24/18 11:16 AM Re: What now for this b1 exhaust port [Re: kevinlc]
B1MAXX Offline
super stock

Registered: 05/07/05
Posts: 753
Loc: Apollo, PA.
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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