well i have this website that a member gave me on here but i dont know none of these values so i cant calculate compression.

does anybody know what the compression would be on a 5.3 with 317's ?? its for a turbo build and a few guys have told me these heads will work really good with high boost just wanted to know what the compression would be like.

 

not sure but I would figure around 9.0:1 due to the larger chambers on the 317s.

 

317s on a 5.3 will be 8.4
241 on a 5.3 will be 8.8
243 on a 5.3 will be 9.1