Reply to "compression ratio"

marlinjackThe Machinist #5723 AMARGOSA MACHINE 'Running on Empty- Middle of Nowhere'

Here is what I have read: 1. '74's ARE 8.0 to 1 compression ratio because they DO have open chambered heads AND dished pistons. 2. The australian heads are disirable because they have the smaller '2v' ports AND the 'closed' chambers. So you get the high velocity for chamber filling AND the 10.5 to 1 compression ratio, when using flat-top pistons!. 3. The years(72-73??)that had open chamber heads WITH flat-top pistons were at 9.5 CR. 4. The 71's and I 'think' the Boss 351 had closed chamber heads with pop-up (domed)Pistons, OR were they flat-top? Their C. Ratios were 10.9-11.2 to 1. 5. Lastly; from the book "How to rebuild Ford V-8 Engines, the chamber CC's were: 75.8, 91.4, 73.5, 96.2, and 89.0 that is all. Regards, Marlin.

[This message has been edited by MARLIN JACK (edited 06-29-2004).]

6/29/041:54 PM

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