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I have twisted wedge trick flow heads on a stock 5.0 HO motor .030 over. i once entered the combustion cahmber size , 61cc, into a desktop dyno and it was telling me around 11.2:i. This sounds high to me, can anyone help me approximate some other way? thanks -joe
 

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That is high. The stock 5.0 heads are 64cc I believe. Stock pistons are around 8cc for the valve reliefs. Just a guesstimate here but I would say 9.0-9.5 to one. Someone will find a calculator for this and do it right
 

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Bore - 4.030 inches
Stroke - 3.00 inches
Cyl head volume - 61 cc
Deck height - 0.000 inches
Head gasket bore - 4.050 inches
Head gasket thickness - 0.039 inches
Piston dish volume - 8 cc


Compression Ratio is:
9.122 : 1
 
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