Page 10 of Lunati Pistons by Holley Performance Products, Inc.

cams helpful calculations now we are finally ready to calculate the compression ratio examples swept volume 716.62 cc total chamber volume 86.07 cc valve train compression ratio swept volume total chamber volume /total chamber volume compression ratio 716.16 86.07 86.07 compression ratio 9.33:1 total combustion chamber volume for a specific compression ratio cylinder head chamber volume swept volume desired compression ratio 1 pistons examples swept volume 716.62 cc desired compression ratio 11:1 cylinder head chamber volume swept volume desired compression ratio 1 cylinder head chamber volume 716.62 11:1 1 cylinder head chamber volume 71.66cc rods cylinder head deck machining to reduce total chamber volume cylinder head deck material removal current chamber volume desired chamber volume x deck material per cc by experience we have learned that a small block chevy cylinder head will need 0.006 deck removed for each cc we want to reduce an open chamber big block will take 0.005 per cc these numbers will put us in the ballpark always check by cc-ing the cylinder head chamber volume for accuracy cranks engine kits example current chamber volume 86.07 cc desired chamber volume 71.66 cc deck material removal per cc 0.006 deck material to remove current chamber volume desired chamber volume x deck material per cc deck material to remove 86.07 71.66 x 0.006 deck material to remove 0.086 apparel tech line 662-892-1500 231

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