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Old 09-15-2004, 03:59   #1 (permalink)
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AFD releases new head

The "small port " 4v head is now available from AFD. Specs include 210cc runners and 330 cfm as cast from the intakes.MInimum cross section is 2.16 square inches.These look to be about the bees knees for a stroker application or a high revver.Intake port is similar to a filled 4v so current manifolds like the TFC etc are the way to go.
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Old 09-15-2004, 21:23   #2 (permalink)
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Re: AFD releases new head

Have you measured the cross sectional area of the AFD 2v's. I have and come up with 2.4 inches. How can the 4V's be less? When i first looked at the pictures of the 4V AFD's, they reminded me of the CHI heads. Still, being a AFD owner, i hope they all work good.
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Old 09-16-2004, 02:52   #3 (permalink)
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Re: AFD releases new head

Quote:
Originally Posted by xdclevo
Have you measured the cross sectional area of the AFD 2v's. I have and come up with 2.4 inches. How can the 4V's be less? When i first looked at the pictures of the 4V AFD's, they reminded me of the CHI heads. Still, being a AFD owner, i hope they all work good.
If your minimum port restriction is 2.4 then something is awry .should be 1.961 square inches according to the manufacturer.This is what Dave from AFD has said on another forum.I have heard this before so maybe you should clarify this with Dave as 2.4 seems awfully big.
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Old 09-16-2004, 03:19   #4 (permalink)
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Re: AFD releases new head

I did the test a few months ago, and there is a lot of variables in doing the test. I can't remember exactly now, but the only way i could get close to 1.9 inches was if i used a very large radius for the corners in the calculation. I have the heads off in my room, so i can check and give port dimentions if you know how to acuratly equate it. I did the checks in the port approx at the pushrod hump area. This has been an ongoing debate with many coming up with a lot larger than advertized, but i wont say for sure as i am not an expert on the topic.
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Old 09-16-2004, 06:47   #5 (permalink)
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Re: AFD releases new head

Quote:
Originally Posted by xdclevo
I did the test a few months ago, and there is a lot of variables in doing the test. I can't remember exactly now, but the only way i could get close to 1.9 inches was if i used a very large radius for the corners in the calculation. I have the heads off in my room, so i can check and give port dimentions if you know how to acuratly equate it. I did the checks in the port approx at the pushrod hump area. This has been an ongoing debate with many coming up with a lot larger than advertized, but i wont say for sure as i am not an expert on the topic.
Trying to establish minimum port restrictions is difficult sometimes and would be made easier if you can make a port mould,then measure .
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Old 09-18-2004, 18:53   #6 (permalink)
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Re: AFD releases new head

Quote:
Originally Posted by xdclevo
I did the test a few months ago, and there is a lot of variables in doing the test. I can't remember exactly now, but the only way i could get close to 1.9 inches was if i used a very large radius for the corners in the calculation. I have the heads off in my room, so i can check and give port dimentions if you know how to acuratly equate it. I did the checks in the port approx at the pushrod hump area. This has been an ongoing debate with many coming up with a lot larger than advertized, but i wont say for sure as i am not an expert on the topic.
What was the measured width and height?

I measured my factory heads at 1.89 square inches.
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Old 09-19-2004, 05:32   #7 (permalink)
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Re: AFD releases new head

Quote:
Originally Posted by xbgs351
What was the measured width and height?

I measured my factory heads at 1.89 square inches.
These are taken in the middle of the port and to the depth where the first pushrod is, using 5/8 radius's in the corners. Did we do the same way?

I measured 1.92 high and 1.4 wide.
1.40 x 1.92= 2.688 sq inch. (port including corners)
All 4, 5/8 radius in each corner equals .336 sq inch.
2.688 - 0.336= 2.352 sq inch.

(I did the same with a stock, unported 302c and got 1.97 sq inch.)
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Old 09-20-2004, 02:40   #8 (permalink)
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Re: AFD releases new head

Quote:
Originally Posted by xdclevo
These are taken in the middle of the port and to the depth where the first pushrod is, using 5/8 radius's in the corners. Did we do the same way?

I measured 1.92 high and 1.4 wide.
1.40 x 1.92= 2.688 sq inch. (port including corners)
All 4, 5/8 radius in each corner equals .336 sq inch.
2.688 - 0.336= 2.352 sq inch.

(I did the same with a stock, unported 302c and got 1.97 sq inch.)
that is not what it,s meant to be. I would be consulting with dave from afd and airing my concerns.
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Old 09-20-2004, 02:46   #9 (permalink)
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Re: AFD releases new head

A few people on 351cleveland.net found the same inc machinists. Look @ it this way. If it works? Whats the problem?

My heads (218cc CHI) heads aren't supposed to work well on a 351. I can tell you they completely blow away my old cast irons what netted me 230rwkw with a slipping auto.

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Old 09-20-2004, 03:02   #10 (permalink)
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Re: AFD releases new head

I remember that discussion well brenx with nathan higgins finding the same size as xdclevo had.Then afd dave replied back and said the restriction should be less than 2 inches square.2.4 is not what the size should be.It was stated as being 1.961 inches.That is a big difference.What is going on ? If I had purchased a set of these heads i would certainly like to know why there is such a difference.And it does not seem to be an isolated incident.
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