milled gt40 cc's

blksn955.o

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st.louis mo 314

Jun 4, 2006

#1

• Jun 4, 2006

• #1

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

bubb rubb says:"woo woooooo"

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

 

blksn955.o

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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

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maybe thumper would know

 

OrangeMustangGt

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

 

W

wytstang

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Guesing close to 50cc thats quite a bit removed.

 

Grn92LX

Fidanza Man!

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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

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#8

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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

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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

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#10

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Grn92LX said:

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?

Click to expand...

thanks

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