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Sup Guys,I just recieved my parts in for my next build Cp 9.0:1 compression ratio 75.5mm bore and Ferrea flat face 5000 valves..My question is with these parts do you think i can achieve close to the stock 9.2:1 Z6 compression ratio with out having to mill the head to achieve this? Or with will these valves alone put me in that target area im trying to achieve?..Thx Guys
 

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It depends.

If you send your head to a competent shop, they can ensure that the volume of the chamber meets your requirements for whatever compression you think you want to run.

Also, if you believe any manufacturer's claims of SCR with a piston, especially when you don't know the compression height and total displacement, you are being very, very foolish.
 
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