Aussie heads are 62cc (yes,no). What are late model modifed heads 79.9 cc. Why not swap in an early set of cleveland heads? Are the valves to big to produce useable torque?

 

I think those Aussie heads would work great, except they usually cost anywhere from $400-$600 a pair if you can find them. Plus they usually need to be rebuilt. The closed chamber 4v heads wouldn't be the best choice if your planning on running the engine below 5000rpm. The valves and ports are way too big to be of any practical use on a truck motor. Another problem is finding an intake to work on a 351m/400 with the bigger 4v ports, also I don't think anybody makes headers for that either. You would probably have to run a 351c intake with spacers and custom exhaust. Flat top pistons are cheaper and easier to find, that's probably the biggest reason hardly anybody uses those heads.

 

I see. The manifold is the problem. 400 to 600 bucks is a lot for a pair of heads that need rebuilt. How do you tell the aussie heads from other cleveland type heads?

 

Aussie 302C heads with the closed chambers are the hot ticket and they are somewhat difficult to find. Late model 351M/400 heads are +/- 78cc, exactly the same as all 351C 2V heads. Valve size is not an issue, as a matter of fact anyone who knows the real deal on 335 series motors will tell you that slapping a set of big 4V valves in 2V heads is a serious performance enhancer. The issue with the 4V heads, both open and closed chamber, is strictly the giant intake ports which reduce A/F mixture velocity and the less-than-stellar flowing exhaust ports.

 

There is a company in Englewood Colorado that sells Aussie heads new. They are very expensive at $1350 a pair complete and ready to bolt on. This company is called "Cam Research". They specialize in Ford Camshafts only. Ask for Scott 303 762-0022

There website is http://www.camresearchcorp.com They don't list the heads on there site yet but they carry them

Xaviar
96 F-250HD 4x4 460/E4OD 4.10
Banks Power Pack, Banks Trans Command
MSD 8227 Coil, MSD 32199 8.5 Wires, MSD 6A

 

Powerheads Inc (http://www.powerheads.com/) also sells aussie heads for $975 complete.

 

Thanks for the web site Bill! I'm glad to know that there is someone else suppling thoses heads. At a good price too.

Thanks again

Xaviar
96 F-250HD 4x4 460/E4OD 4.10
Banks Power Pack, Banks Trans Command
MSD 8227 Coil, MSD 32199 8.5 Wires, MSD 6A

 

OK now I'm going to make all of you jellous. I live in Australia and I own a 351C + heaps of parts and today a friend just GAVE me a set of closed chamber 2V 302 heads of FREE!!! Sorry guys none of my stuff is for sale, but if you can get it to the usa Australia is full of the stuff. Hey I bought my 351 (with closed chamber heads, and in EXCELLENT CONDITION) for a carton of beer which cost me $31.75 Australian money. That motor required only minor work, (leads, plugs [$4.50 each], tappet cover gaskets, [$18.75] paint, [two tins @ $11.95 each], carby kit [$44.50] and a fuel filter [I already had it]) It now runs perfectly with no vibration or smoke.
Don't think we have it all good but, our fuel is VERY expensive and unlike you lucky Americans who have literally dozens of Ford V8's to choose form, the only Ford v8's we really have are the 351C, 302C, 351W, 302W some new electically injectied "objects" and occasionaly an old Y block. Anything else is imported and not common, definately not easily accessable anyhow.
I agree adding 4V valves to 2V heads makes one HELLOVFA CEVELAND!! and I have already recomended doing it on this forum.
335C

 

Aussie clevo heads have the small intake ports (2V) and closed chamber (heart shape) designed combustion chambers, as opposed to a round combustion chamber found on open chamber heads. The only reason I could think of wanting to use them on a 351 is to increase compression, and then fuel quality becomes a problem.

 

Sorry, Christian, have to disagree. Up the compression with Quench heads, to 11:1 with flat tops and still run on 91 octane. Now use open chamber heads, and dome pistons, then you need to use 100 octane. Just clarifying that Quench heads are better for high compression, and a lower octane.
Jeff

 

I think you'd be struggling to run 11:1 compression on 91 octane.

 

Christian...LoL...we are disgussing this on 2 differant topics. But with Quench heads, and flat top pistons, you are going to get, 11:1 compression, (Or atleast VERY CLOSE) You can use 91 octane. Trust me I do it. I know it does not matter over the internet, becuase there is no way to prove it, but it can be done. I do it everytime I fill up. I am in the US, and I use 91 Chevron. no pinging...trust me...trust me...

Jeff

 

MightyMach is correct. You will get around 11:1. You get 9:1 by using just flat tops and 78/79cc heads. Slap on a set of 62/63cc heads with those tops and you get about 10.8:1.

Stryder


I'd rather be walking through a hot desert carrying a Ford hubcap than driving a POS Chevy

 

The Laws of physics agree. (is it physics?) LoL. But the wierd part is, the Quench Heads allowing to run a higher compression, yet a lower octane (91 with 11:1).

Jeff

 

Actually it the Laws of Mathematic Computation that apply here. Plug some number into a formula and it all comes together.

Stryder

I'd rather be walking through a hot desert carrying a Ford hubcap than driving a POS Chevy