What's the difference? I have noticed that the 5.3s are cheaper. I have also seen LS1 heads and LS6 heads. What is the difference? Don't they both just bolt up? Why choose one over the over? I just need to know so I can figure what direction to go with my car. It's my daily driver.

 

Im sure a search will help, but for starters, 5.3L heads will give you some increased compression... good for a N/A setup...

 

5.7's and 5.3's flow relatively the same and this is with the 5.3 having a smaller intake valve (2.00 vs 1.89). when ported they are again pretty much the same, the 5.3 has a smaller chamber which will most likely spec out to ~62cc when its said and done, this will raise your compression a half a point and more in conjunction with a thinner gasket. so with the 5.3 you get the same flow of the 5.7 and you get the increased compression all w/o milling.

ALL gen 3 heads bolt up. what it comes down to is your budget and application.

 

https://ls1tech.com/forums/showthrea...=5.3+heads+5.7

https://ls1tech.com/forums/showthrea...=5.3+heads+5.7

https://ls1tech.com/forums/showthrea...=5.3+heads+5.7

Try that too... simple search in the internal section...

 

added compression = more hp?

 

With all the advantages of the 5.3 why would anyone choose to go with 5.7 heads? The last I checked the 5.3s were cheaper too.

 

forced induction and or nitrous..

 

Well, patriot makes stage 2 heads that are cheaper than any 5.3 heads that work on 97-98 cars.

And people who live in the heat probably don't want any more compression!