[DeTomaso] Compression Ratio Question

[JDeRyke at aol.com]

In a message dated 9/21/07 11:40:31 AM, asajay at asajay.com writes:
> Off the shelf hyperuetectic flat top pistons for 351C .030 over Stock Rods 
> and crank (no stroke modification) Stock 4V quench heads
> 
> So what's my CR? They way I figured it, somewhere around 10:1 or 10〓:1
> 
> Has the block ever been squared? Have the heads ever been squared or had a 
valve job? Stock valves? Whose pistons? Rods ever been rebuilt? All the above 
plus factory tolerances on everything will influence C.R. To my knowlege, one 
just CANNOT get the C.R closer than 'approximately' unless one piston crown 
height to the top of the block for each bank is measured with a depth mike, along 
with checking at least one combustion chamber volume in each head. I use ATF 
from a 100ml burette for this last. No substitute for the classic method even 
though it takes an assembled short block with the heads off to determine it. 
Sorry- J DeRyke




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