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Re: [T3] Compression Ratio and Combustion Chamber Size....

>What have you got? A high and a low compression head?? 2 different
>years?? I have the same deal on the dual ports I am planing on using on
>my '66 FB. Maybe we could do some swapping. My low compression head has
>the step built into it, where the cylinder seats. I picked up a couple
>more dual ports the other day, but I haven't looked at them close enough
>to see if they are any good.
>Russ Wolfe

Russ, - sending this to the List since it adds to the total picture.....

The 3/4 side is the original head from my 71 Fasty that I flycut just enough
to clean up the cylinder mating surface when I rebuilt them last summer. 
The 1/2 side is a brand spanking new Brazilian EMPI head.  Both have had a 3
angle valve job done.  Neither have the step in the cylinder mating surface.

One other fact is that I measured the heads with two different apparatus. 
The 3/4 head was measured in the Lab at work with dedicated cylinder head
measuring equipment.  The new head I did at home with a 5 cc syringe.  There
is likely some differences in the measurement method.  Since all indications
are that I will need to get into both sides and I was planning on pulling
the engine for this job anyway (going to put in a new main seal and a new
clutch disk, too), I will measure the 3/4 head with my at-home method and
run the numbers again before reassembling.

Plan is to do it tomorrow afternoon so swapping would be a bit of a problem.

John Jaranson
'71 FI AT Fasty (Jane - Darkside Project)
'66 Square (Sophy - Daily Driver)
About Half a Late Square (Organ Donor)

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