I have recieved a small quantity of Australian 351 Cleveland cylinder heads from Australia. In fact, I have 5 sets that I'm trying to sell. They've been cleaned and magnafluxed and are in rebuildable condition. I hate to use this forum as a sales tool, but I've recently been laid off and need to move these out of my garage. I'll sell them for $425 and give you free shipping. If you like to view pictures of a set that I've had cleaned, then click on the following links.
From what i understand all australian 351 2V heads are open chamber. All australian 302 2V heads are closed chamber, that would make the heads in your photo 302 heads. Tha ports are the same, just different combustion chambers.
.....however, you must consider the fact that anyone using these heads in the U.S. on a Cleveland are in fact using them on a 351 Cleveland in order to boost the compression and take advantage of the quench design and the smaller ports for better torque. There's not many in the U.S. building 302 Clevelands. In the circle of motorheads I run with, these heads (technically 302C heads) are affectionately refered to as Australian 351 Cleveland heads. "Aussie heads" for short.
The 2V and 4V terms don't really apply to Aussie heads. There were no large port heads produced there. They all had small ports and small valves. 351s used open chambers and 302s used closed chambers. There is no 2 or 4 cast into the corners. They also made small port 4V intake manifolds. I'm fairly sure for spread bore 4V carbs only. No holley bolt patterns.
Brain in the aussie falcons, GTHO's were fitted with 4V closed chamber heads cast in the US. Falcons with 2V heads were fitted with open chambers some were 2 barrel some 4 barrel depending on options etc, the 4 barrel intakes were square bore holley flange in 2V port size, and when the polution motors started to come out ford Australia started to use the spreadbore intakes (can't give them away)with carter thermoquad carbs only during the late 60's early 70's in the GT falcons we were lucky enough to have the 4V's fitted from the factory hope this helps out
While the Aussie closed chamber heads may have been used on a 302 there, if you look at the water passages in the pictures, you can see that these are desigined for a cleveland block, and will not go on an american 302 with modification (the water passes through the block in a cleveland, through the intake on a 302)
Dan, seeing you know that the 302 clev had longer rods have you ever tried using them in a 351? There is a piston available for this combo and it will give some good results, especially with the 2v heads and dual plane maifold, we made just under 500hp with one such combo.
This was a very common practice in Australia. When rebuilding a 302C, many people buy a 351C crank, use their 302 rods and buy custom pistons with a shorter pin height.
An Aussie should be able to point you in the right direction for the parts.