400 Cylinder Head Casting Numbers

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Nov 17, 2004 | 05:35 PM

Mud Rat

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From: Eastern Ohio

400 Cylinder Head Casting Numbers

I have two heads for the 400.
One casting number is D5AE-A2A, the other is D5AE-A3A.
Are there differences between the two?

Nov 17, 2004 | 05:52 PM

74 F100 351m

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From: Okla.

:-x25 ??????????????? :-x25

Nov 17, 2004 | 07:46 PM

BrentKasson

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From: Ottawa, KS

My guess would be different years maybe, or perhaps casting places. I think i saw that all cylinder heads on the 400 were the same from 75 on? Check out bubbaf250's website. Good info there.

Nov 18, 2004 | 07:44 AM

Donnie Knight

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I think this link may supply you with some info, http://home.earthlink.net/~bubbaf250/parts/pics03.html

Nov 18, 2004 | 02:43 PM

squirrelhunter

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Both heads are 74.5 cc. They are 77-later 351M/400

Nov 18, 2004 | 03:26 PM

beartracks

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From: Albuquerque

The first two digits indicate decade and year. In this case 1975. I believe the factory tolerance for 2V heads was 78 to 80cc.

Nov 19, 2004 | 07:54 AM

Bill_Beyer

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From: PacNW

The A2A & A3A are engineering revison #s. I don't know of any place to find out exactly what was changed but I'd suspect they're virtually identical. I wouldn't hesitate to use them on the same motor.

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Nov 21, 2004 | 11:22 PM

Matts72

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From: Montana Territory

Yes there were two different heads for the 400...

They are the same as far as chambers and valves go...

The difference is that one has a rotator thingy on the exhaust stem, the other one doesn't.