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3514v closed chamber Aussie heads vs north american
#1
Hey everyone,
 I have a 73 3512v 177 hp. So I started looking for heads, I found Aussie 3514v closed chamber. I know the same north American heads increase my hp to 280 but most of the research I've done says Aussie heads are more because exhaust valve and ports are bigger but can't find info on how much they increase hp.
 If anyone knows answers to these questions or where I can find info 
What do they change my compression ratio too
What are the port specs for identification
 Will I have a hard time finding headers
My searches are coming up with anything
Any other + or - I should know about
  Reply
#2
Most people use the Aussie 2V head off the 302C, since it has the smaller 2V ports with a closed chamber like the 70-71 M-code engine. Not aware of the aussie 4V heads, so can't help you there. The US 4V heads from 70-72 had the 2.19/1.71 valve sizes. In '73-74 they switched to the 2.05/1.65 2V valve sizes in the 4V heads. 4V port sizes always stayed teh same, doubt that the Aussie ports are any bigger, if they actually exist.

http://www.ausfordparts.com/ausheads.html

I did a similar build to what you're contemplating, a '73 2V short block with 4V heads. The result was "okay", but I would swap to flat top pistons if it was a complete build. You definitely need to swap cams as well, the 2V cam is tiny.

US 4V casting numbers below - borrowed from the Pantera forum.

4 no dot - D0AE casting - 63cc quench -
4 no dot - D1AE casting - 66cc quench -
4 + .dot - D1AE casting - 66cc quench -
4 + .dot - D1ZE casting - 75cc open..
4 + .dot - D3ZE casting - 78cc open.. -


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#3
Just changing your heads from open chamber to closed chamber did not boost your horsepower to 280. You would have had to also change your camshaft, intake manifold and possibly pistons.

Ford Australia originally imported all of their Cleveland engines from the US, including the closed chamber 4V heads. Starting in 1972 they could only import the open chamber heads. When Ford US stopped production of Cleveland engines Ford Australia started producing the engines, including heads. The only 4V heads they produced were open chamber and were the same as US 4V open chamber heads. The Australian closed chamber heads had 2V ports and were produced for their 302C.



“If you can't explain it simply, you don't understand it well enough.”
--Albert Einstein
  Reply
#4
(12-02-2018, 09:22 AM)BB72mach1 Wrote: Hey everyone,
 I have a 73 3512v 177 hp. So I started looking for heads, I found Aussie 3514v closed chamber. I know the same north American heads increase my hp to 280 but most of the research I've done says Aussie heads are more because exhaust valve and ports are bigger but can't find info on how much they increase hp.
 If anyone knows answers to these questions or where I can find info 
What do they change my compression ratio too
What are the port specs for identification
 Will I have a hard time finding headers
My searches are coming up with anything
Any other + or - I should know about
I have a set of Aussie 302C closed chamber heads on my 73 351C 2v.

The Aussie 302C 2v heads were closed chamber designed for a de-stroked 351C Australian engine with intake and exhaust valve sizes that were very close to the US 351C 2v valve sizes and identical intake and exhaust port sizes. They have an ideal street combination of North American 4-barrel, closed wedge chambers with a smaller 56-59 cc and 2-barrel ports.

From what I understand there is a head referred to as a 351C head in Australia but is not a closed chamber head, they were all open. Some say there are closed chamber and others say open only. I have looked for them, but have never seen them. I think folks see an Aussie closed chamber head for a 351C block and think its an Aussie 351C closed chamber head, but it is actually an Aussie 302C head. Open or closed, these Aussie 351C heads are reported to have 64-67 cc with intake and exhaust valve sizes identical to the Boss 302 heads and intake and exhaust port sizes identical to US 351C 2v and the Aussie 302C heads.

If you are looking at heads that look like the US 351C 2v, but with closed chambers then they are likely the Aussie 302C heads. You will need to use dished pistons with these heads to get compression down to a suitable level for pump gas. You can use any 351C 2v style intake and exhaust manifolds with them.

Aussie head casting numbers begin with “AR” on the valley side of intake ports. For example, “ARD1AE” on one and “6090A” on the other stands for “AR-D1AE-6090-A.

Here is a thread about Aussie Heads... https://www.7173mustangs.com/thread-auss...ght=aussie
  Reply
#5
(12-02-2018, 09:22 AM)BB72mach1 Wrote: Hey everyone,
 I have a 73 3512v 177 hp. So I started looking for heads, I found Aussie 3514v closed chamber. I know the same north American heads increase my hp to 280 but most of the research I've done says Aussie heads are more because exhaust valve and ports are bigger but can't find info on how much they increase hp.
 If anyone knows answers to these questions or where I can find info 
What do they change my compression ratio too
What are the port specs for identification
 Will I have a hard time finding headers
My searches are coming up with anything
Any other + or - I should know about

Exactly what do you mean by "Aussie heads are more..."?

Exactly what are you wanting to achieve?

Below is a static compression calculator.

http://www.wallaceracing.com/cr_test2.php

.
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