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Aus 2V Heads
I've heard a lot about the Australian 2V heads, are they really ported that much better? I was going to get some hooker headers, an airgap, holley 600 and the Aus2V's replace the valve train while I'm in there with this paycheck. What are the benefits of going with the Aus2Vs? I'm normally not too concerned with everything I do effecting horsepower but I've heard there's more to be found in the Aus's as well. Anyone care to chime in? Not sure what the next paycheck will go to, probably an MSD setup. Disposable income, I better enjoy it while it lasts Angel

I picked up a set of aussie 2v heads. They are closed chambered heads where the stock 351C 2v heads as well as the 4v heads are open chambered heads. The closed chambered heads increase compression ratio, not sure about the porting. Had screw in studs installed, new guides, new manley valves, comp cams springs and 1.6 (I think) roller rockers. Have not started the motor since the rebuild so I am anxious to see how much improvement my combo has. Also new comp cam, performer intake, 750 holley and sanderson headers.

Here are a couple of pics, top is stock 351c 2v head and second is aussie. Hope this helps.

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aussie heads are nice...so are any 4v cj head..better move up too a 750cfm carb and a decent lift cam if you move up too heads like these..or its kinda a waste ..you can get a set of 4v heads closed and open for a good decent price still...and will flow way more that you will ever need on the street or track....and dont be afraid of open chambered heads now days...they do breath a bit little better than closed chambered..but not as much compression..and like the new gas a little better over all...unless you plan to run pure race fuel and want high compression..which you can get out of open chambered now days anyways with all the high domed pistons....a 4v open or closed chamberd cleveland head can flow up too 800 horse power or more if tricked out .....im putting just a 525 lift cam..750 holley...stock 4v heads with shims..hooker headers...and according to jegs..ill be getting around 425 too 450hp...i had to dump my new 600 elderbrock thou...it couldnt handle it even all jetted out..lol
I would go with the 4V's with the open chambers if I were doing it.Just alot less work involved and alot more potential.The closed chambers are great,I run them, but like was said I do have to mix my gas because of detenation(knock).I never had to do that with the open chamber heads. As was said the 600 Holley is just to small for the big Clevelands they do like alot of fuel! Be sure and up grade to the one peice valves and good rocker arms no mater what head you use! The secret to the 4V heads is in the torque converter( for autos) and the gearing. The Clevelands all use the 1:73 ratio rocker arms,not the 1:6s.Good luck!

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If I were you, I would go with the "original" intent for the "paycheck", that is get the exhaust taken care of first - - get the headers an a decent set of mufflers.

As to the Australian 2V heads, I have heard they are nice (for some applications) but for what you seem to be going for, I believe there are "better" things you could do with your money. As stated and/or inferred by "hyena429" and "FastE", there is REALLY nothing wrong with ANY of the Cleveland heads as long as they are set up for the application. The "Open" chambered heads do have the harden valve seats which help when running unleaded gas. You can get almost any compression ratio you want through the matching of the appropriate pistons. The same can be said for the "Quench" (closed chamber heads).

So, it really comes down to your deciding what you REALLY want out of the car and deciding whether or not you want to build on what you got now or go in a different direction. In the end, it is ALL about matching the parts to get the desired results.

Hope this helps!


Do the RIGHT thing.
Search on "H-code to 350HP". It was a good thread on the subject. Chuck
I would run Aussie 2V heads, mild hydro flat tappet cam, some headers, and a good ignition (I like a MSD 6A and Blaster II coil). The Aussie heads give alot of quench and this helps the whole performance package. I would go with the Scorpion brand pedestal mount roller rockers and this way you don't need to spend all the money for screw in studs and guide plates and machine work to have them installed. I would stay away from hydrualic roller cams in a Cleveland because they are very expensive and some brands can cause a harmful drop in oil persure when the lifter is at max lift as the lifter oil slot may become exposed above the top of the lifter bore. Also custom pushrods will be needed because the roller lifters are very tall. Hope this helps.

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Here is what I went with, the SP4V

Placed my order for the MSD 6A/BlasterII setup and some hookers. As far as the heads go I think I'm just going to pull the 2Vs and clean them up with the money saved. Where would a good place be to start on getting the current 2Vs fixed up?

I was looking at either the Holley 0-80670 or 800 CFM Thunder from Edelbrock for a carb. I've heard good things about the Demons but not enough good things to spend the extra money for it. Since the intake and the carb will be spaced two weeks apart would you get the carb or the airgap first? I still have the motorcraft on there, not sure if the new carb would be too much for the current stock setup since she still has to drive in the meantime.

I would wait the 2 weeks and purchase them together. Save on shipping and install both at once.

Jeff T.

Low buck, touring style, '73 Convertible "rolling restoration", 351c, 2v heads with a shave and a haircut, Performer intake, Holley 650(ish), roller rockers, screw in studs, guideplates, stainless valves, Duraspark / Motorsports MSD, T-5 conversion. 1-1/8" front, 3/4" rear swaybars KYB shocks and some home brewed subframe connectors. Future plans; JGC steering box, Cobra brakes and... paint, interior, etc.

When I die I want to die like grandpa, peacefully in my sleep... not screaming, like his passenger.

[Image: 1_12_09_14_10_15_11.png]
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