milled gt40 cc's

[blksn955.o]

looking to nail down my total compression ratio and need to know about what mill amount is = to what cc size.

Like a .004, .020, .030, .040, .045, .050, .060, .065 mill.

My non-P heads are milled .060-.065 and I was wanting to know about how much it changed the cc from the 65.5cc stock.

Thanks

 

[urban96]

i was also wondering the same thing about my gt40p's they were milled ~.030

 

[blksn955.o]

As long as this chamber has been around in the gt40 heads and as long as the heads have been around. Someone has to have some sort of ball park figure +/- 2-3cc's.

 

[urban96]

maybe thumper would know

 

[OrangeMustangGt]

i agree, my gt40p's were milled .004, how much did this change the compression ratio?

 

[wytstang]

Guesing close to 50cc thats quite a bit removed.

 

[Grn92LX]

If I remember, around .008" removed = 1cc. So if thats true for gt40 iron heads, do the math assuming .008" = 1cc. What was the CC of the heads originally?

 

[urban96]

stock gt40p=59cc

the shop also milled down my heads a lil more when i brought them in to be freshend up a bit so ill add .004

so .034 / .008 = 4.25

so 59 - 4.25 = 54.75cc

now to dig up the compression formula

 

[urban96]

well went to http://www.csgnetwork.com/compcalc.html and did this

is that the right info for stock shortblock? i wasnt 100% sure about stroke/piston dish/deck hieght

 

[blksn955.o]

If I remember, around .008" removed = 1cc. So if thats true for gt40 iron heads, do the math assuming .008" = 1cc. What was the CC of the heads originally?

thanks

and urban the 302 crank has a stroke of 3.00 IIRC.