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compression ratio calculation help?
I had my vortec heads milled .005 using 6cc pistons stock 3.48 stroke 4.0 bore .031 thick gasket i just dont know how much the milling effects the cc on the heads.
2 Answers
- chevyraceman_383Lv 710 years agoFavourite answer
On the small blck chevy heads .006" milled off = 1 cc
Vortec heads are rated at 64cc, but every set I have CC'ed has been 62-63cc stock
So yours will be 61-62cc heads
That gives you 9.97403:1 to 10.0878:1 compression
If 63cc on the heads, it would be 9.86305:1
- 10 years ago
That little milling should NOT affect the compression. If you used "Dome Top"pistons you may increase
compression but just milling will not significantly change anything. The .031 gasket may have a very slight difference but not noticeable
