C6AE-R Head Q's

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Apr 25, 2010 | 09:43 PM

lt465

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Trailering

Joined: May 2009

Posts: 18

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C6AE-R Head Q's

I have a set of c6ae-r heads on a motor in a 76 f250 i recently acquired, which supposedly has a 390. I wouldnt think those are the origonal heads for that truck or possibly whole different motor for that matter. I hear these heads are low-risers and are referred to as the poor mans cj head and am considering using them in my next build.

The thing i am curious about is if the headers off my d2te-aa heads will fit the c6ae-r's, and if the c6ae-r's have adjustable valvetrain?
thanks

Apr 25, 2010 | 11:41 PM

johnboy427

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Joined: Jan 2005

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From: The Vieux Ford, Kansas

In my book they are 66-67 352 heads and nothing to write home about. 71-74cc chambers and don't have adjustable rockers. Your D2 heads would be better because they already have hardened exhaust seats. Pretty sure the low risers are C3s.
-John

Apr 27, 2010 | 11:13 PM

Hypoid

Cargo Master

Joined: Apr 2004

Posts: 2,574

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From: Golden, CO

Quote:

Originally Posted by johnboy427

After 36 years, I think the induction "hardened seat" is pretty much a moot point. He has heads with tall intake runners on a truck that never came with them from the factory. At this point the only two people who know for certain if the heads have hardened seats are the machinist who worked the heads, and who-ever installed them.

Also, from what I've read, and seen firsthand, 1966 was a pivotal year for the heads having the tall, "low riser" intake ports with open chamber, and the later "velocity ports" with "semi quench" chambers.

There are other sources I can reference, but they'd just take my lunch money.

To the OP: FEs are like a box of chocolates, you don't know what's inside until you open it.

I've read about problems with Hooker brand headers lining up on the later heads. I'm really pulling straws out my **** here, but I think the C6-R castings may fall into that category. Your best bet would be to pull one exhaust manifold and measure from the top and bottom bolt holes to the edges of the exhaust port. With that info, you can see where the header ports land by checking the same measurements.