mods in sig but i don't have flow numbers on the heads. is the only way to find my compression to take the heads off and get the flow numbers? stock is 10.4:1 and its just a small port job, do you think it affected compression much?

-Chris

 

Flow numbers have nothing to do with compression. What you would have to do is pull your heads and CC the chambers (fill them with a measured amount of liquid) to see how big they are. Then go here and punch in the numbers to figure out the compression ratio.

If it's just a light port job and you didn't have the heads milled or anything, I wouldn't worry about it.

 

if it was a port job, don't worry about it, it will be just be a smidge lower and effect nothing

 

awsome thanks, last thing i needed to get tune

-Chris