like the title says.
i was thinking about it today, on 317s how many ccs are taken off with every .010" milled..

my plans were LQ4 and 862 heads with 2.00" valves and ported, that would yield me around 10.5:1 compression..

can a similar compression be obtained with 317s, they already flow better and have 2.00" valves..

any info would be awesome guys..

 

bump...

 

5.3 heads on a lq4 is around 10.8

for .03 off the heads that is around 7 cc

317s milled that much will net you same results as installing 243s on a LQ4 which would be 10.4

 

best info for us...

https://www.performancetrucks.net/fo...6&postcount=17

 

How much meat can be milled from the head before you have head to intake sealing problems?

 

The max you can go is about 40 before you start running into intake issues

 

Thanks i was really wondering about that when I change my cam out. I want to mill the heads because they are a 72 cc and the motor was built for FI but i went NA instead so a boost in compression should help a little.