hemi heads - 460 Ford Forum
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post #1 of 9 (permalink) Old 09-03-2011, 02:27 AM Thread Starter
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hemi heads

What does the dish do that is milled into the later high hemi heads? I have the old 4.900" bore space high hemi that don't have the dish.
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post #2 of 9 (permalink) Old 09-03-2011, 09:39 AM
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Are ya talking about the two quench pads?
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post #3 of 9 (permalink) Old 09-03-2011, 04:51 PM
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Quote:
Originally Posted by henry b. View Post
Are those cracks from the seats to the spark plugs holes?
Yep, but the're just surface cracks and the last guy that ported the heads before i got them as well as Kaase's shop (where they are now) don't think they're a problem, from what i've heard it seems to be pretty common on these heads.
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post #4 of 9 (permalink) Old 09-18-2011, 12:40 AM
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Quote:
Originally Posted by carlie View Post
What does the dish do that is milled into the later high hemi heads? I have the old 4.900" bore space high hemi that don't have the dish.
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post #5 of 9 (permalink) Old 11-20-2011, 08:46 PM Thread Starter
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hemi heads

I've seen some of the later Ford hemi prostock heads that have the same combustion chamber as our heads but they have a dish that's been milled into them that sort-of mimics the old a441 Ford hemi prostock heads true hemi chamber. I was wondering why the current prostock stuff had the dish. This is obviously a modification that wasn't used on the earlier high hemi b441 prostock heads.
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post #6 of 9 (permalink) Old 11-22-2011, 05:12 AM
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Probly been alot of combustion chamber research done since the hi hemi b441s came out in the early 90s?
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post #7 of 9 (permalink) Old 11-23-2011, 12:06 PM
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Quote:
Originally Posted by carlie View Post
I've seen some of the later Ford hemi prostock heads that have the same combustion chamber as our heads but they have a dish that's been milled into them that sort-of mimics the old a441 Ford hemi prostock heads true hemi chamber. I was wondering why the current prostock stuff had the dish. This is obviously a modification that wasn't used on the earlier high hemi b441 prostock heads.
The heads Filucky posted are the Roberts design with a centered verticle wedge chamber which gives a double quench area (very effective). Some alky racers we know mill out the chambers to a full hemi, just like the older AR A-441 heads. I don't know what you mean by "milled dish"?
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post #8 of 9 (permalink) Old 04-23-2012, 01:49 AM Thread Starter
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Originally Posted by J. Shelfo Sr. View Post
The heads Filucky posted are the Roberts design with a centered verticle wedge chamber which gives a double quench area (very effective). Some alky racers we know mill out the chambers to a full hemi, just like the older AR A-441 heads. I don't know what you mean by "milled dish"?
How many cc's can be taken out of the b441 hemi heads by chamber softening mods ? That's the milled dish I was referring to.
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post #9 of 9 (permalink) Old 07-06-2012, 11:23 PM
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The dish is just to lower the compression ratio. I run B441 heads on my 645 inch Comp Eliminator engine and we had to add a dish to the piston to get the ratio down to around 15.8:1. The B441 head has a relatively small combustion chamber when used on large engines.

Cliff

Cliff Wright
Comp 6111
www.hemiford.com
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