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

 

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?

 

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.

 

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.

 

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?

 

Get LS6 heads from Patriot $450

 

haha thats more than what Im paying for the motor!

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

 

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!

 

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

 

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