Re: wanted - Ford Cylinder Heads
 

Bret,

Are these the same ports and chambers as the F1ZE-AA? I know that AA have GT40 cast on them, but otherwise I think they're identical to the BB. If that's true, it may be worth asking NHRA to approve them.

It's a suggestion which I'm sure won't sit well with some folks.

Re: wanted - Ford Cylinder Heads
 

They are the same head. I mentioned the same idea to Marty. We have done that in the past.





Bret Velde
2003 ??/SA

Re: wanted - Ford Cylinder Heads
 

Someone told me that the F1ZE-AA head has larger valves than the F1ZE-B head.

Re: wanted - Ford Cylinder Heads
 

The -AA come with 1.84/1.54 valves.

The throats on a set I have measured 1.64"/1.27", which would give you a 92% intake throat and a 87.5% exhaust throat when using 1.780"/1.450' valves.

In other words, you'd need to change the intake seats because the throat's too big. A 92% throat will work, but 88%-90% is where you want to be for a stocker.

You'd also have to sink the exhaust valve, but there's enough material on the seats to keep the throat at 88-89%. Depending on how much you have to sink them, you may be better off replacing all seats in the heads.

Re: wanted - Ford Cylinder Heads
 

The F1ZE-B head has 1.84/1.54 also. That's the head I had my 92 Mustang SS/LA car.




Bret Velde
2003 ??/SA

Re: wanted - Ford Cylinder Heads
 

Thanks Bret!

Re: wanted - Ford Cylinder Heads
 

Bret, I am confused. The F1ZE-B is an approved cylinder head, but the blue print spec. shows valve size to be 1.782"

Re: wanted - Ford Cylinder Heads
 

Yes, we had to take the 1.84/1.54 valves out and replace them with the the legal 1.78/1.45 valves. Just like Sbillison said in a previous post.



Bret Velde
2003 ??/SA

Re: wanted - Ford Cylinder Heads
 

https://www.ebay.com/itm/29572191802...Bk9SR_D1ovrKYg

here is a set on eBay for sale