gallo-lo

iTrader: (11)

I'm lookin in gettin my cr to a 8.9 or 9.1 how much should I have the heads milld down to? I'm doin the 5.3 boostt72 .96 t4 build w/317 headsGM headgasket .54, z06 cam , z06intake, 80lbs inj, th400 9.5tc, 3.23 gears.

Snyper

iTrader: (27)

What size pistons? Im running -11cc pistons with unmilled CNCd 317s and thats what my compression is.

The Beast

iTrader: (16)

241's will put you at 8.9 on the stock 5.3 short block with a GM gasket

gallo-lo

iTrader: (11)

I'm usin stock 5.3 bottom. I think I should go with 241heads if it brings me there . I have about 3 sets of 317 heads.

XXX37

youd want to mill about .020 off.

LS1PUNK

iTrader: (5)

Remember ur removing material and making the heads thinner, possibility of lifting the head is greater now.

I would suggest picking up a pair of 243's or 799's, flow just as well and have a smaller cc.

Ur set up is VERY similar to mine except im running twins instead of a single.

Fondle

iTrader: (4)

why would you mill the heads if you are trying to lower your compression? keep them stock

tripblackls1

iTrader: (11)

because 317 will lower it to almost 8.5to1 and everybody generally believes that is too low

gallo-lo

iTrader: (11)

i guess ill wont get them mill.

LSXFORMULA99

iTrader: (12)

i have -22 pistons with ls9 head gasket and untouched 317s on my 370...how low is mine? 8:1? GAY!