flippincamaro

iTrader: (23)

61cc milled 20thousandths what size chamber will it be. I want about a 58cc The stock 5.3s are 61cc i have been told. Will i achieve this by milling 20 thousandths. If not how much will i have to mill to get this thanks kenny also i did a search and could not find this

jrp

iTrader: (16)

58.14 according to my calculations, assuming an exact 61cc chamber.

flippincamaro

iTrader: (23)

thanks man that was fast

DanZ28

iTrader: (5)

I thought stock 5.3L heads where 64cc ? Since JRP didn't say anything, I guess their 61cc.

How man thousanth's to a cc JRP?

Dan

DanZ28

iTrader: (5)

Quote:
Originally Posted by DanZ28
Brent,

What's the chamber size of these heads with no milling? Trying to figure out what my CR will be..

Dan

they are close to 64cc's with no milling.

This is what I got from TEA anyway..

M6HuggerSS

damn thats a tiny chamber.... whats your target CR? 14:1????

flippincamaro

iTrader: (23)

11.5.1 or 12.1 compression

ssheets

iTrader: (1)

Not to step in where JRP has already answered, but it seems you're quoting Brent out of context. I know Brent knows what he's talking about ant JRP is always spot on.

read: https://ls1tech.com/forums/advanced-engineering-tech/111207-ls1-head-combustion-chamber-cc-volume-vs-cr.html

JZ'sTA

iTrader: (23)

I have always seen the 5.3's as 61.37cc's.
From what I have read a quick way to figure out CC's after milling is every .06 you mill it equalls about 1 cc.
So if the head is milled .20 you divide it by .06 which equals 3.33
Now take 61.37 minus 3.33 and you have a new cc of 58.04.
Pretty close to what JRP got and I am sure he used a similar starting cc on the heads.

jrp

iTrader: (16)

from the info that i've seen the stock chamber is 61 and when they are ported the chambers are opened up a bit to install the new seats for the bigger valves. ported castings i've seen chambers 62 - 63cc's.

hence why i said "assuming an exact 61cc chamber", if he his heads are ported then the chamber indeed may be bigger.

DanZ28

iTrader: (5)

Thanks for setting me straight guys .

Brent was talking about his 5.3L ported Stage 1.5 heads being 64cc with no milling. I don't think I so much took it out of context as I was more so confused at the stock chamber volume vs ported. I have read that sticky thread several times, just wanted confirmation .

Now I know and thanks again!

Dan

flippincamaro

iTrader: (23)

thanks jrp and jzs ta mine are stock valve the guy told me about the bigger seats then the chambers become bigger. So i left it alone for now since i am running low on cash already but thanks all for the help