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Old 04-21-2005, 11:44 PM   #1 (permalink)
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Porting Aussie cleveland heads!

Doing a set of aussie heads for a customer, 351c, hyd cam (230 @.050), basic engine with good chassis. Car was running 8.16-8.22 in 1/8 drags. Got the head up on the flow bench and boy does this thing stall! Opened up the bowls some but castings are a bit thin. So...after playing around some got the numbers to go from 224 cfm at .500 lift to 245 cfm by artificially raising the floor. Going to raise it with a vane. You cant believe the difference in sound before the vane and after...just alot of difference. Port is only 5cc larger than stock and stock valve. Reverse flow is low so that is good. Customer is wanting to run in the 11's so this should help. Also raised the exhaust floors by brazing them up flat, which changed the sound of them drasticly too. I will post some pics this weekend and more flow numbers and show what the vanes look like. Too bad I cant post the sound...BIG change!
Brian
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Old 04-22-2005, 12:45 AM   #2 (permalink)
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Porting Aussie cleveland heads!

Be very careful you don't kill the velocity. Its very easy to do, and its the secret to the 2V heads. Exhaust flow is the inprtant one, generally most here in australia concentrate on getting this as close to 90% to inlet as possible.

Very simply ported heads ie pocket port and short turn on inlets, and exhaust go 11's in a full size car.

I love them!

I look forward to your figures, sounds good so far

[ This Message was edited by: Jason on 4/22/05 12:46pm ]
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Old 04-22-2005, 04:06 AM   #3 (permalink)
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Porting Aussie cleveland heads!

i'm busy porting my 2v aussie and about half way through,

i've taken away metal on:

- either the left or right side hump thing, sorry cant remember if the head is upright or upside down

- short side radius

- narrowed down valve guides

- bowl job and blend

- general smoothing out in direction of flow

i've got them flow 245cfm from .5 to .6 at 28

should have some good torque and mid range for my 1980 falcon, cam is 238/248 at 50

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Old 04-22-2005, 08:24 AM   #4 (permalink)
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Porting Aussie cleveland heads!

I'd love to see what you did with those exhaust floors because I am thinking of brazing them up flat too! I am using some HTS-528 alloy rod to add material to my Aussie heads.
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Old 04-22-2005, 09:36 AM   #5 (permalink)
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Porting Aussie cleveland heads!

Yep - it's real easy to screw up 2V heads. I hurt mine putting in the 4V valves. Still flowed 235 after the "pop" at .450+, 256 before. The exhaust flows 220 and I didn't hardly do anything to it and didn't fill the floor. I really fail to see the point, based on the fact that you're going to have a 1 3/4" pipe bolted up right after the end of the port.

I don't care what it flows on the bench or how it sounds - show me it changes something on the dyno or ET slip and I'll worry about it then.
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Old 04-22-2005, 08:05 PM   #6 (permalink)
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Porting Aussie cleveland heads!

Well I will have time slips to prove the porting works, cause thats all were doing aside from Comp Cams beehive springs being added. I tested this port with a pipe attached to the port before the fill and after and there is a TON more velocity coming out with the floor filled. I wish I could do just one thing at a time and test but I dont have that option. Im not out to prove im the best in the west or anything, just though Id share some info with the board and some pics. I wont have pics until Sunday, got too many other things to do but I will post them. Im using the stock valve size, but instead of laying back the shortturn to get the flow higher above .500 Im epoxing a vane on the floor to manipulate the boundary layer of air so that it hangs on to the rather wide and rounded short turn. Plus the port is small and the velocity is still very good. Infact the intake port is very smooth up to .450 lift. The vane just helps the port flow more air with more valve lift and at the same time curbs turbulence. The cross sectional area at the short turn is hard to get as big as the throat area because of the castings being thin, so keeping the stock valve is THE way to go. I will list the flow numbers and some velocity numbers in important areas so anyone wanting to do this themselves has an idea of where is best to grind.
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Old 04-22-2005, 09:30 PM   #7 (permalink)
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Porting Aussie cleveland heads!

it will be so nice to get a good aftermarket Cleveland head. Nowadays under 300cfm is nothing for a cylinder head.. I will admit I am very anti stock casting heads though.. I find that it cost more and gains or less to use them.
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Old 04-23-2005, 01:06 PM   #8 (permalink)
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Porting Aussie cleveland heads!

It's VERY good information and you're to be commended for sharing. I think the port velocity is a key item and that's why I layed in a Parker Funnelweb and port tongues for the 4V heads I'm building. That similar treatment works on a 2V just goes to show that poking around with things can be rewarding. The short turn does seem to be a real bitch in the 2V - and adding 4V vales (like I did) seems to make it worse.

But the car still runs good, so I'm not complaining.
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Old 04-24-2005, 11:17 PM   #9 (permalink)
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Porting Aussie cleveland heads!

Well guys I got nothin done this weekend! Lets just say I spent good time with my family. I will have some photos and numbers soon...maybe wednesday night. Im also doing a set of Dart pro 1's so maybe Ill get some pics of them as well.
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Old 04-30-2005, 01:55 AM   #10 (permalink)
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Porting Aussie cleveland heads!

Sorry for the delay...was having trouble making the intake port pull at higher lifts using a wing in the port, so I ground the wing out and layed back the short-turn and ended up with 256 cfm at .550 lift. Low lift flow is very good and I will have pics this weekend! Been doing alot of jobs lately so time has been really limited. Anyway just wanted to let you guys know.
Brian
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Old 04-30-2005, 07:14 AM   #11 (permalink)
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Porting Aussie cleveland heads!

Cool! Definitely been looking forward to seeing those pics.:
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Old 11-12-2007, 01:16 PM   #12 (permalink)
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Re: Porting Aussie cleveland heads!

Very interesting read

The Australian 302C 2V closed chamber heads are a good little item for some serious horse power gains

cheers
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Old 04-13-2010, 04:36 AM   #13 (permalink)
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Re: Porting Aussie cleveland heads!

Quote:
Originally Posted by ou812 View Post
Sorry for the delay...was having trouble making the intake port pull at higher lifts using a wing in the port, so I ground the wing out and layed back the short-turn and ended up with 256 cfm at .550 lift. Low lift flow is very good and I will have pics this weekend! Been doing alot of jobs lately so time has been really limited. Anyway just wanted to let you guys know.
Brian
Would have been nice to see those pics
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Old 05-15-2010, 05:43 PM   #14 (permalink)
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Re: Porting Aussie cleveland heads!

I just got my set of Aussie heads in that I found a good deal on from Craigslist. These have screw in studs already, and although not necessarily a plus they have 2.19/1.71 (4V size) valves installed. It also looks like they have had a little porting done, and with a little more cleanup and blending may just do very well.
Take alook at these, and if you see anything that looks like it needs to be worked on, I appreciate your trained and experienced eyes. I realize it's hard to do through pictures, but maybe you can spot some obvious stuff.

I still need to take some pictures of the exhaust ports, I think they need quite a bit more work still.















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Old 05-15-2010, 05:55 PM   #15 (permalink)
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Re: Porting Aussie cleveland heads!

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