Milling heads, compression and power question.........

[61ragtop]

If i was going to mill my heads from 75cc chambers to about 71-72cc at .008 for angle or .006 for flat mill per cc, will I have to change my push rods?

Also it would bring me from 9.7 to 10:1 for compression on a motor making 442 HP and 472 TQ at the 9.7:1. What sort of power gains would this bring me?

The reason I ask is I have an option to have it done for $100 when I get my new heads from AFR on warranty and am wondering if it is worth doing?

[ArtosDracon]

This is on the AFR's right? I think going to the eliminators is going to require a different length pushrod to begin with, but I am 100% sure AFR will know for sure from the design end.

If the heads are the same angle and height, .006-.008 probably will not require a pushrod change, .010 and higher will though. The only way to be 100% sure is to check them on the engine.

[61ragtop]

I guess I will need to change them then as that puts me at .018-.024 if they mill 3cc's off the chambers.....

[theRG]

I don't know your exact combo, but just going on power numbers your car won't benefit much power wise from a .3 increase in static compression. Save the 100 bucks for something else. If your AFR's are coming fully assembled maybe put that towards a valve or valve spring upgrade, I would definantly upgrade to their race or severe duty valves if they aren't standard in your heads.