Best Read I have had on LSX engine specs.

Gen III GM Small Block: Engine Builder

Seen a few similar articles, but a good read nonetheless. Thanks for sharing:)

ok...so how do the 4.8/5.3 heads flow compared to the ls1 heads?

you could use ls1 heads on the 4.8\5.3 to raise compression due to the smaller 66.7cc chambers right?

Quote:

---

Originally Posted by banker099

ok...so how do the 4.8/5.3 heads flow compared to the ls1 heads?

you could use ls1 heads on the 4.8\5.3 to raise compression due to the smaller 66.7cc chambers right?

---

Actually, a 5.3 head has a smaller chamber... Casting #862 and 706 '99 and up 4.8-5.3l trucks
Chambers = 61cc

Quote:

---

Originally Posted by SS Killer

Actually, a 5.3 head has a smaller chamber... Casting #862 and 706 '99 and up 4.8-5.3l trucks
Chambers = 61cc

---

yep this is what kills the 4.8/5.3 in the aftermarket head game.. we are already running the smallest combustion chamber by far.. and if you go to milling the heads you just start to eat into the combustion chamber so I am not so sure it even helps raise compression. so we are stuck with trying to find smaller bore/compress more whatever head gaskets that might net us .4-5 compression.. sux..

Good article......Nice find!