Would putting the above heads on my 351 C bring up the horsepower significantly, has anyone here done this before?
I have no reason to take off the 351C heads at the moment but if I do have to for some or other reason I would like to know if the Aussie heads would be good for more compression.
If they were to increase hp then I guess I could dig deep and find a genuine reason for taking off the old heads, I mean, I am sure I could find a little head gasket leak somewhere if I looked really really hard with a magnifying glass, just to sustify any expense that might be incurred.

the aussie heads do work well on a 351c or a SBF but If you don't own a set then you need to consider that they don't come cheap.
Is your motor a 2v or a 4v engine?
do you have domed pistons already?
what is your compression now and how much will the closed chamber heads bring it up to?
How much do you want to spend on the refitment to make these heads work?
how much will it cost to rebuild the aussie heads?
Unless you are racing and you need every advantage then I'd think you will get more performance for less money by reworking what you already have.
Hope this doesn't turn you off the idea,just make you think about it.
good luck

351 is a 2V, I've got the 302 cleveland heads, they have been 'overhauled' and are ready to be put somewhere, they are pretty common round here, seeing as we got mostly Ozzie stuff after 1969. Compression at the moment is about 9.5:1, with the 302 heads I was thinking it might bring it up to about 10.5:1, but thats just a guess on my side, pistons are .20 overbored at the moment but doubt whether they are domed, will have to look at that price wise, but I don't think it will be that expensive, I may even have a contact for a set of domed one, if I can find the guys number amongst the dark maze of info on my hdd.
Refitment wise, well got to still look into that, according to the Falcon site in Oz they will just bolt on, no problems, but I guess the truth of that will be in the actual doing of it.
Thanks for the help.

the clevelend head's even in 2 barrel form have huge port's...and are really for a high rpm motor...my grandpa has built many motor like this...you have to drill and tap some water passages...and than find a boss 302 intake.(not easy)to fit it....there may be a spacer now but im not sure...his motor's had 13-1 pistons..soild roller cam....and ran 10.70's in a full drag car...but turned it 10000 rpm...that was 20 years ago....now there is edelbroke...canfield...brodix...afr...heads that will run circle;s around any aussie head....and still retain the common sb ford intake manifold....

Hmmm forgot about the intake manifold, and those things are like hens teeth here, as are 4 bbl holleys. Back to the drawing board

The Aussie 302 is a short stroke Cleveland engine built in Australia, unlike the Windsor 302s built here in the states. The heads should bolt to your 351 Cleveland with no trouble at all using a standard 351C 2-barrel intake manifold. The closed chamber head should give you the same compression as a 4-barrel Cleveland.

Crashfarmer is correct, a direct swap and it should increase compression enough (with the quench in the combustion chamber too) to increase horses to make the swap worthwhile. A whole lot cheaper than the pop up pistons and the work involved. You can even use the 4 bbl Cleveland intake although you'll have some port mismatch. It would be better to run a 2bbl specifc aftermarket intake. You could probably do the heads and intake for less than the pop up piston swap would be.

I have a performer Intake manifold and a 600cfm 4 bbl Holley on at the moment, so it should be okay to use that, with the 302 C heads?

That's just the right one.

Thanks, just the kind of reply I like to hear