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01-20-2011 #1
Starting The Transformation
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- Aug 2009
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- Langley BC, Canada
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Milling heads, compression and power question.........
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?
Kevin Freund
1961 Impala Drop Top
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01-20-2011 #2
Registered User
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- Mar 2010
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- AZ
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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.Robert R.
1988 S10 blazer 5.0L SBC 700R4 body off build.
1991 S10 Blazer 4.3L too low daily.
1975 Cutlass Salon currenlty 350/th350
Stupidity should be painful.
01-21-2011 #3
Starting The Transformation
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I guess I will need to change them then as that puts me at .018-.024 if they mill 3cc's off the chambers.....
Kevin Freund
1961 Impala Drop Top
01-21-2011 #4
Registered User
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- Nov 2009
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- Knoxville, TN
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- 45
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.
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