brad8266

iTrader: (23)

I have been trying to figure out how much i can mill of my heads. I know i can actually get it measured but it would be nice if there is anyone that has done this and can speak to it. I have 5.3L heads and i want to know how much i can mill off of them safely.

Valves- 2.055 1.570
Cam-232/236 .575 .578 112 LSA
Head gasket- .040
Pistons- Diamond flats with -2cc valve reliefs(.100 relief)
Pistons come .006 out of the hole.

I was hoping to get .030 milled off, is this a long shot or is it ok?

PREDATOR-Z

Too much.
.030 mill would make them 58cc and with .040 it would be like running 55cc chambers

GuitsBoy

iTrader: (4)

What compression are you looking for?

brad8266

iTrader: (23)

~8.5 Dcr

brad8266

iTrader: (23)

but I have 2cc of valve reliewf in the pistons too.

Thimble

iTrader: (2)

I'm in the process of doing almost the exact same thing right now. Assuming you've run your specs through a CR calculator, you know the spec you need is the chamber cc, and not so much the "amount milled".

Unless you know exactly what cc's your heads are at now (and if it's the TEA heads in your sig they will be more than stock 5.3 62cc), they would have to be cc'd first in order to determine how much should be milled to arrive at your desired chamber size.

My 5.3 heads are headed back to TEA to be cc'd, milled, then re-cc'd to verify finished chamber volume. I want a 59cc chamber, which I figure should need somewhere around .020" taken off to arrive at 59cc (figure every .005" milled loses 1cc).

With my G5X4 cam, .040" Cometics, -2cc piston reliefs, and the 59cc chamber, I should end up at 11.5 scr - 8.56 dcr. With your milder cam, I can't see you needing that small of a chamber to get to 8.5.

brad8266

iTrader: (23)

I have 2 ccs in the pistons alone, .040 head gasket, and the heads are 63cc right now. I need 58cc heads to get 8.5 DCR