5.3L heads on a 4.8L

[Jaw_Dropper]

It wont show any improvement will it considering there stock right? Will it just drop compression?

[Gator]

<div class='quotetop'>QUOTE(Jaw_Dropper &#064; Jan 8 2007, 08&#58;54 PM) [snapback]78780[/snapback]</div>

It wont show any improvement will it considering there stock right? Will it just drop compression?
[/b]

I believe the 4.8 and 5.3 use the exact same head
01-06 casting 862 in/ex Vol(cc) 200/70cc -----ComChmb(cc)61.15

[RedHeartbeat]

yep, same exact heads.

[Jaw_Dropper]

awww that sucks i got a pair just laying around in my storage facilty that we took off a van. I knew there were couple things that can be interchangable between them just didnt know the heads were the same.


What size valves do you think I can put in them I&#39;m wanting to fully port and polish them? Can i go with a 2.05 intake with the factory heads or is that to big? What size exhaust size should i look into? Any help is appericated. I want the most i can push out of the factory heads.

Thanks

[Ascrap2003]

Grab the heads get them milled to run 10.5:1 Compression and get a mild port & polish.
Add a Z06 cam, LS6 intake, 3,000-3,500 stall, 1 5/8" Long tube headders w/full exaust 2.5", pcm tune & 4.11 gears w/ posi.
You won&#39;t be sorry

Hey that&#39;s a wicked combo. I&#39;d like that on a 5.3 single cab a a lil larger cam & a 125 wet shot&#33; Woo hoo&#33;&#33;&#33;&#33;&#33;&#33;&#33;&#33;