5.3 LM7 compression ration with 66cc heads?
03-31-2010, 09:32 PM
#1
5.3 LM7 compression ration with 66cc heads? Ok so I know the stock compression ratio on an lm7 is 9.5:1 (with factory 61cc heads). My plan is to mill my lq4 heads (71cc in stock form) .030" to end up with 66cc's. With a gain of about 5cc's in doing this what would I be looking at in terms of my new compression ratio? I know its lower than 9.5:1 but by how much?
03-14-2013, 10:45 PM
#2
On The Tree
Ok so I know the stock compression ratio on an lm7 is 9.5:1 (with factory 61cc heads). My plan is to mill my lq4 heads (71cc in stock form) .030" to end up with 66cc's. With a gain of about 5cc's in doing this what would I be looking at in terms of my new compression ratio? I know its lower than 9.5:1 but by how much?
