00Silv4.8

iTrader: (10)

Trying to get some figures. I have a chance at an 01 6.0. Owner says its got "burnt valves" so then would I be able to just swap the heads from my 4.8 (862s) to the 6.0? Also what kind of compression would I get? y's and y not's would be appreciated. Thanks

00Silv4.8

iTrader: (10)

from what I've read: Stock "5.3 heads": (Im guessing 862s? if not they arent far off?) 61.15cc chambers, 1.89" INT valve, and 1.55" EX valve.
Stock 6.0 heads: 71cc chambers, 2.00" INT valve, 1.55" EX valve.

So Im asking for input: is the boost in compression gonna be worth the some what smaller INT valve, or should I maybe do some stock LS1 heads with a 66.67cc or LS6 with 64.45cc chambers that flow much more up top?

GMCtrk

iTrader: (27)

Zippy did 6.0 with 5.3 heads.

I don't like it. What's the most important factor in making power? Air. What are you doing with 5.3 heads? Choking off the engine. 1 point of compression is only 10 hp anyways apparently.

TurboGibbs

iTrader: (6)

The 243's (LS6) are essentially identical to the 317's but with a smaller chamber. They flow similar. All other factory cathedral port heads flow less.

00Silv4.8

iTrader: (10)

ok. my whole problem is that the motor Im buying is supposed to have "burnt valves" and I wont know untill I take it apart probly not till next sunday

so maybe Ill just buy some new valves or something untill I get an opportunity for buying heads?

GMCtrk

iTrader: (27)

Get LS6 heads from Patriot $450

00Silv4.8

iTrader: (10)

haha thats more than what Im paying for the motor!

I think if its gonna come down to it Ill get some LS6 heads

GMCtrk

iTrader: (27)

Hope you're getting a good motor.

One of the guys who helped me put in my LQ9 put an LQ9 in his trans am. Fired it and had no oil pressure!

95 bright teal

give this guy a call
http://phoenix.craigslist.org/evl/pts/870564128.html

95 bright teal

the only 243's i can find in the area are going for 900+