Aussie Head Build-up
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Fleet Mechanic
Joined: Jul 2000
Posts: 1,493
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From: SE Iowa
Aussie Head Build-up
I'm in process of building a 400 for my cousins '78 1/2 ton, and was wondering...What compression ratio would I get from installing Aussie heads with either Ohio 9:1s or 351C KB 9.5:1s? The block and heads are unmachined.
Stryder
I'd rather be walking through a hot desert carrying a Ford hubcap than driving a POS Chevy
Stryder
I'd rather be walking through a hot desert carrying a Ford hubcap than driving a POS Chevy
Posting Guru
Joined: Aug 2000
Posts: 2,416
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From: PacNW
Aussie Head Build-up
[font size="1" color="#FF0000"]LAST EDITED ON 03-Jul-01 AT 11:20 PM (EST)[/font][p]The Aussie heads have a +/- 62cc comb. chamber. According to the compression ratio calculator you'd end up with pretty close to 10.6:1 with the Ohio pistons.
Senior User
Joined: Jul 2001
Posts: 298
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From: Oztralia
Aussie Head Build-up
Aussie Heads come in to sizes open and closed.
Down here we used to put closed chambers on 351's and open them up for flame travel and air flow. The closed head is from our 302 Cleveland. The open heads flow better and have good flame travel (suprisingly) and would be great on a 400. The aussie heads are best identified by the thick lip under the intake ports. Good heads easy do 450+ HP
Down here we used to put closed chambers on 351's and open them up for flame travel and air flow. The closed head is from our 302 Cleveland. The open heads flow better and have good flame travel (suprisingly) and would be great on a 400. The aussie heads are best identified by the thick lip under the intake ports. Good heads easy do 450+ HP
