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So, been looking at the possibility of turboing my N/A BA barra. Id been doing some research on it and decided to look into some math on it. The BA XR6 has a compression ratio of 9.7:1, and the Ba XR6T has a compression ratio of 8.7:1. I wanted to find out what thickness of head gasket would lower the compression enough. I found values for what I could.
Swept volume = pi x bore radius^2 x stroke. which is pi x 4.613^2 x 99.31 = 663.911cm^3 this is the displacement per chamber, just with more decimals compared to 664.

Bore: 92.26mm This gives a compression ratio of 9.672:1.
Stroke: 99.31mm
Chamber Volume: 66.3911cc
Gasket Thickness (assuming steel): 0.76mm To active low enough compression for turbo, I increased the gasket thickness in the calculator.
Gasket bore: 93mm
Deck Clearance: 0.3mm
Piston dish: 3cc
Compression Ratio (CR) Calculator - Good Calculators

2mm = 8.812:1
2.28mm = 8.641:1
In comparison, the FG XR6T is 8.47:1

THIS MATH ONLY APPLIED TO THE BA FALCON BARRA 182.

So the age old, "just slap another head gasket on it" seems to work. I havent put this into practice, but I might possibly in the future, however with the additon of ARP studs.

Hope this may give some hope to those looking to Turbo.
 
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