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Author Topic: Aussie 351C 2V info  (Read 9560 times)
lsrfco
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« on: April 15, 2010, 04:34:35 pm »

We've got a 351C that we'd like to get another cam for. It's stock Aussie heads on it and I need flow bench specs to get a good recomendation. I know they're supposed to be the same as open chambered 2V's, but think the different chambers could have an effect on flow numbers. And I don't want to pull a head off to get it flowed. I hope somebody out there might have a flow chart so I could get close to what they flow. With the different heads (open, closed chamber), intakes (single, dual plane) and carburation (holley750, 2&4 hole holley injection and holley street HP 750) this thing only made 200 (early) to 250 (late) Horses to the tire, it's got to be the cam holding it back.
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windsordeath
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« Reply #1 on: April 15, 2010, 09:54:02 pm »

They should be different, They ran the bigger valves in those heads as well from what I hear..

Lemme ask though. are you sure it's a 351? Could be a 302.
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lsrfco
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« Reply #2 on: April 16, 2010, 09:05:36 am »

The valve size is the same between the two. I used the SS ex. from the open heads, but had to get new int.s because the guy that ported them used 4Vs. It was a 351C when I built it 20 yrs ago and only has around 1,500 mi. on it. It's in a 4,200 lb. Rancharo show car that gets driven to the shows and needs a little more acceleration. 
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hcetretsam
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« Reply #3 on: April 25, 2010, 06:33:23 pm »

cool
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incon_92
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« Reply #4 on: July 13, 2010, 12:56:07 pm »

powerheads.com sells Aussie 2V heads and I think they have some flow numbers on their web site.
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eboost
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« Reply #5 on: July 18, 2010, 09:34:51 am »

why are these 'aussie' heads? lol
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scienceguy
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« Reply #6 on: July 18, 2010, 11:29:38 am »

The valves are seriously shrouded on Aussie 2V heads.  The chambers need unshrouded big time, especially if larger valves are used.  In this case, the heads won't flow JACK until the chambers are relieved.  There's just not enough room for the air/fuel to flow around the valves when open, as the chamber wall is right in the way.
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xdclevo
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« Reply #7 on: July 21, 2010, 07:07:13 am »

why are these 'aussie' heads? lol

Yep, sounds weird hey. Just called plain crappy old 302 heads where i come from. I can't remember how many i have dumped over the years and have two sets making a nusience of themselves in my garage at the moment.
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BrutalBronco
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« Reply #8 on: July 23, 2010, 09:44:51 pm »

Flow rates: http://powerheads.com/images/FLOW-TEST-aussie-2V.gif

Valve Shrouding: done 5 angle w/ throat cut 85int/90exh and found that valves had <0.080" radial clearance. reworked with dremel to 0.160", and gasket matched the ports. upon reassembly found that 0.028/0.031" squirters didnt work anymore, and upgraded them to 0.035/0.035" and wants more now that phenolic spacer was added. 406CID 400 block, 10.76:1 measured CR,133052 CraneCam, 2.19/1.71 race duty valves, and 8391 Holley 81/86 jetting. 4400lb truck 0-60 pretty good.
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jaythefordman
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« Reply #9 on: July 24, 2010, 01:45:54 am »

The valves are seriously shrouded on Aussie 2V heads.  The chambers need unshrouded big time, especially if larger valves are used.  In this case, the heads won't flow JACK until the chambers are relieved.  There's just not enough room for the air/fuel to flow around the valves when open, as the chamber wall is right in the way.

Indeed, but don't go too crazy.

Never go larger valves on intake though, screws the short turn flow and airspeed.  You will chop into water trying to get it right.  biggest mistake people make with the 2V Closed chamber heads.

want 4V valves, use 4V heads. My 2c

Yep, e boost, yanks never got the 2V closed chambers, hence the 'aussie head' tag.
 
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PALEALE
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« Reply #10 on: January 14, 2011, 11:01:40 pm »

I've got 270 cfm@.480 lift with stock 2.04 valve, at that point it seperates and crashes to 235. Spent most of my effort on the short turn. I think I can get higher cfm numbers when it does seperate by paying more attention to long turn shape and valve guide boss. No matter what I did could not stop this seperation issue at around .500 valve lift. I cut a junk head down the length of the port to see what thickness I had at the short turn. Ferrea do a 2.07 intake valve and there is enough thickness on the short turn to maintain the shape I got with the 2.04 valve, so I'm thinking the 2.07 valve will give me more area when it does seperate without sacrificing the short turn shape I have.

I think when people put the 2.19 4V valve in, they are taking the "line of sight " approach. I too took this approach when first porting this head with the stock 2.04 valve. I layed back the short turn more, which lowers the port floor and you see more of the valve. It went 240 cfm on the flow bench, the bench I use has a swirl meter. It spun at .100 valve lift and at every .100 lift increment it would spin faster and faster, and you could hear the ports turbulance louder and louder. The velocity probe manometer was off the scale. But it didnt crash, it held 240 cfm at .600 lift and .650 lift. It had seperated straight away and stayed seperated. So maybe when people put the 2.19 valve in they are saying to hell with the short turn, it seperates anyway and goes turbulent.
With the 270 cfm port, the swirl meter does not spin at all, there is only a slight quiver of the blade which is showing that the air is making the turn at the short turn and not seperating until .480 valve lift, then you hear the seperation on the short turn and the swirl meter goes nuts.                                           
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Brian S
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« Reply #11 on: January 31, 2011, 03:20:54 am »

When you look at the flow numbers on the MPG site they definitely don't add up. If you think about it, a flow increase of over 30% won't come just by increasing the valve diameter (2.04 to 2.19") by 7%. Heads ported correctly with stock 2V valve diameters you can make over 500HP...except, I don't like stock valves in performance applications because they're 2 piece design with multi-groove stems. 1 piece, single-groove aftermarket $tainless $teel 2V valves are just fine or stock 460 valves (also 1 piece, single-groove, 2.08I/1.65E) can work well too if you find a set cheap.
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skip02
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« Reply #12 on: February 17, 2011, 11:13:54 am »

are these heads different combustion chamber shape as compared to 4v closed chamber?
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Hayden123
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« Reply #13 on: October 12, 2011, 08:05:52 pm »

They are a very similar shape but less volume.... around 58 - 60 cc
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