slimtastic

iTrader: (2)

ive got a set of 243 heads that im going to be installing with a Zo6 cam on a 5.3 shortblock, but i dont want the compression to drop significantly so im trying to figure out how much i need to take off the heads to get back to 61 cc's.

this engine will be turbo'd as well so im not too concerned if the head cc's come out a bit over 61 cc's....but at the same time i dont wanna go with a 8.5-1 compression ls, id still like some drivability.

how much should i deck the heads??

slimtastic

iTrader: (2)

i was thinking around .020 off the top but im really in the dark on this one

Sales4@Texas-Speed

iTrader: (4)

The general rule is .006" for one cc in chamber size. So if you are trying to go from 64 to 61 milling them .020" would get the job done.

slimtastic

iTrader: (2)

thanks for the info

NemeSS

iTrader: (127)

As long as don't go more than .030

LS Desert Ranger

how much would i need to mill some 241 heads to match the cc's on 5.3L 706 heads?

LS Desert Ranger

anybody?

PREDATOR-Z

5.67cc

LS Desert Ranger

so how many thousandths is that?

PREDATOR-Z

Do some Math, Jeese
.006 x Head cc removed =

Mighty Whitey

Ahh... The rule of .006"= 1cc drop is not linear throughout the entire combustion chamber. The first .006" removes more material than the second, second more than the third, and so on and so on...
While .006" = 1cc is very close, it's not exact. So .030" doesn't remove 5cc exactly.

LS Desert Ranger

how much would you say should be removed? .40 thou or so?

PREDATOR-Z

Proper way is remove .035, measure chamber, remove more if necessary.