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Old 02-05-2005, 12:22 AM   #1 (permalink)
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Building my 400 w/ Aussie heads. Hp/Tq?

I am finally putting together my 400 with Aussie heads. The engine will have about 10.75:1 compression. I am cleaning up the heads and polishing the combustion chambers. The valves are Ferrea 2.07 intake and 1.65 exhaust. The rockers will be 1.7 rollers. I am using a Comp Extreme Energy cam. The cam is an XE256H-10 with 256 duration on the intake and 268 on the exhaust. Duration @ .050 is 212 on the intake and 219 on the exhaust. Valve lift is .487 on the intake and .493 on the exhaust w/ a lobe separation of 110 degrees. The intake is an Edelbrock Performer 400 w/ matching 600 cfm carb. Ignition is a Pertronix Ignitor II.

This is going in a 5,000 lb wagon that I will do some heavy towing with, but I am hoping it will be pretty quick on the street. Any ideas on what this combo will make and how well it should run. I am going to use premium fuel in this since the compression is a little up there and I also want to see if I can get this engine to run well on pump gas.
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Old 02-05-2005, 06:59 AM   #2 (permalink)
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Building my 400 w/ Aussie heads. Hp/Tq?

Sounds like a great build! I bet you will be pleased by the results. Should be able to take off in a hurry! Let us know when you are on the road with her.
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Old 02-05-2005, 07:27 AM   #3 (permalink)
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Building my 400 w/ Aussie heads. Hp/Tq?

Unless you have some type of custom piston, I think you're gonna have detonation. The 400 has excessive deck clearance: the piston is too far down in the hole to give any quench. With that much compression and the small cam in a heavy vehicle, you might be in trouble.
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Old 02-05-2005, 01:02 PM   #4 (permalink)
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Building my 400 w/ Aussie heads. Hp/Tq?

My 400 was decked, shaved heads, ect... and it's got around 11.3:1 compression. I absolutley can't run pump gas or it sounds like sombody dropped a couple marbles down the intake.

I end up running doped up 93 (with Moroso Super 104+ in it) to keep it under control. My stock starter also didn't live that long.
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Old 02-05-2005, 01:51 PM   #5 (permalink)
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Building my 400 w/ Aussie heads. Hp/Tq?

I agree on the detonation part. If I were you I would get the KB reverse dome pistons desgined for a cleveland, and have the 400 rods bushed to allow their use. You will still have adequate compression, but your qunch area will be at its greatest level. ITs the only thing thats gonna keep that thing from pinging on anything other than VP113. Even then, you may have to get creative and look into some of the old water injection kits for when your towing or other extreme load situations.
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Old 02-05-2005, 02:28 PM   #6 (permalink)
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Building my 400 w/ Aussie heads. Hp/Tq?

If I did it all over again, I would have stayed around 9.25-9.5:1 compression (max) so I could run pump gas, as it basicly costs me about $2.50 a gallon to run my truck (currently), compared to $1.68 to run my other truck.

Granted, I've got a little more power due to the compression, but I could have lived with 15-20 less ponies and being able to afford to drive it more...
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Old 02-05-2005, 02:55 PM   #7 (permalink)
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Building my 400 w/ Aussie heads. Hp/Tq?

Wow! Thanks for the real world examples and suggestions! I know there is a guy named Tim Meyer who is over at the Ford Truck Forum who makes a piston for the 400 that will make quench and drop the compression to about 9.5 :1. I did not know about a reverse dome piston w/ bushed rods. This is actually my first ground up from scratch rebuild and not some junkyard specials I am known for running. Any more recommendations for the cam and what it will behave like on the street. Right now it has a single exhaust. I want to put headers on it, but they only make Cleveland headers for Ford cars and trucks, not wagons. I have seen enough of those car shows in Discovery to be able to modify some headers to fit and then go w/ a 2 1/2" dual exhaust into an x-pipe and then the quietest mufflers I can find. -Mike
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Old 02-05-2005, 03:06 PM   #8 (permalink)
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Building my 400 w/ Aussie heads. Hp/Tq?

Actually, you NEED headers and duals with those engines. It'll wake them up more then you think, even a stocker.

Not sure which wagon you have (but I suspect a 72-79 midsized platform like a Torino or whatever), and they DO have headers for them, try Hooker. At least, they used to...

I got a set from Cyclone (or Blackjack? been a few years) for a 76 Cougar with a 400, and it'll be the same basic thing as any of the 72-79 midsized stuff.
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Old 02-05-2005, 03:10 PM   #9 (permalink)
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Building my 400 w/ Aussie heads. Hp/Tq?

It is a '72 Country Squire wagon. Thanks, I'll check those headers out. I want to run duals out to the side behind the rear wheels so it looks nice and stock.
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Old 02-06-2005, 09:54 AM   #10 (permalink)
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Building my 400 w/ Aussie heads. Hp/Tq?

Quote:
On 2005-02-05 14:28, uriah wrote:
If I did it all over again, I would have stayed around 9.25-9.5:1 compression (max) so I could run pump gas, as it basicly costs me about $2.50 a gallon to run my truck (currently), compared to $1.68 to run my other truck.

Granted, I've got a little more power due to the compression, but I could have lived with 15-20 less ponies and being able to afford to drive it more...
How did you get that much compression out of a 400?

The easiest, most effective and cheapest way to run that 400 is by spiking the fuel with Av-Gas. It doesn't cost that much more than pump premium.... and for around $12 to dump five gallons into the fuel tank, you're not only getting octane boost, but you're also getting an extra five gallons of fuel. Fill it up the rest of the way with premium and be happy. You might even get by with 2.5 gallons per tank.

It's WAY cheaper than what you're doing, and works WAY better.

Been there, done that!

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[ This Message was edited by: n2omike on 2/6/05 9:58pm ]
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