6.0 heads vs.5.3 heads

[jdub396]

Will this even work/bolt up (LQ9-6.0 heads on a 5.3)? If so, any gain? Thanks!!

[tawss04]

They will bolt up, you will get a little more performance. The heads are what makes the LQ9 different, they are the same as Z06 heads but with larger combustion chambers.

[jdub396]

In that case...what about bolting up Z06 heads, and increasing compression? Any ideas on what the comp. would be?

[BenKey]

Not 100% sure on the diffs btwn a 5.3 and 6.0 (someone will pipe in if I'm wrong), but pretty sure putting 6.0L heads on a 5.3L will decrease your CR. Just not sure on the chamber size of the 5.3L.

[TurbochargedBerserker]

LS6 = 64.43 cc

LQ9 = 71.06 cc (or pretty close).

 

There's about 1 CR difference there. What size are 5.3 heads?

[jdub396]

Not sure on CC of the 5.3 heads. With the "lesser" cubes, I can't imagine using LS6 heads would put me much over 10 maybe 10.5:1??? That might be a better fit (LS6 heads)...if it will work!?! I hate to lose compression, since I only have 9.5:1 now. Has anyone tried this???

[TurbochargedBerserker]

Not sure on CC of the 5.3 heads.  With the "lesser" cubes, I can't imagine using LS6 heads would put me much over 10 maybe 10.5:1???  That might be a better fit (LS6 heads)...if it will work!?!  I hate to lose compression, since I only have 9.5:1 now.  Has anyone tried this???

<{POST_SNAPBACK}>

 

You won't know if you're losing compression until you either do the math based on the 6.0L head volume or get the volume of the 5.3s.

 

So you have 9.5:1 on the 5.3? That sounds like 5.3 heads are probably big volume (which kind of gibes with what I remember 76cc??)

 

 

Check out this post on calculating your CR.

[SSCUSTOM6.0]

i think the 5.3l heads is either 61cc or 62cc. so this will raise your compression ona 6.0l engine.

[BeefTip]

I am pretty sure that putting the 6.0 heads on a 5.3 will lower the compression ratio. I think thats why alot of people do it so they can run more boost sometimes. I think that if you put them on and you are n/a you will actually lose some hp.

[zippy]

the 4.8 and 5.3L cylinder heads have the smallest combustion chambers. i'd use the 5.3 heads myself. if i buy a truck with a 6.0L more than likely i'd end up with 5.3 heads on it with intake valves from a 6.0L. the only reason to put 6.0L heads on a 5.3L is to lower the compression.

[jdub396]

the 4.8 and 5.3L cylinder heads have the smallest  combustion chambers. i'd use the 5.3 heads myself. if i buy a truck with a 6.0L more than likely i'd end up with 5.3 heads on it with intake valves from a 6.0L. the only reason to put 6.0L heads on a 5.3L is to lower the compression.

<{POST_SNAPBACK}>

 

 

ok....so what about slapping some LS6 heads on??

[zippy]

if i recall they still have a larger combustion chamber than the 5.3L. other than a larger intake valve i'm not seeing where there'd be much gain to make up for less compression. on a 5.3, use 5.3 heads.

[BeefTip]

I would probably just clean the 5.3 heads up you have now, I imagine you could mill them some to bring up comp but im not sure.

[jdub396]

Thanks all!!