ok, im going to sell my friend my LQ4 short block to install in his 06 rcsb. He has a Maggy TVS1900 and all bolt-ons. I have 2 sets of heads hes interested in, one is 317 Heads with LS2 valves and were freashly rebuilt and a pair of ported 241's and LS6 valves. Which set is better for boost with meth....???

LQ4 with 72 cc 317

Bore 4.00 inches
Stroke 3.622 inches
Head Gasket 0.051 inches
Deck Height 0.010 inches
Piston top
volume 8
Head CC 72

Equals 9.05 compression


LQ4 with 64 cc 241

Bore 4.00 inches
Stroke 3.622 inches
Head Gasket 0.051 inches
Deck Hight 0.010 inches
Piston top
volume 8
Heads CC 64

Equals 9.82 compression

 

They will be right if you plug in the correct number for stroke: 3.622 in.

 

oh ****..lol.. my bad...fixed

 

72cc heads will be like 9.5-1( ruffly) with a stock head gasket.

 

With your numbers (assuming a 4.05 gasket bore) I come up with 9.408 with the 72cc head and 10.24 with the 64cc head.