head games

[letaurus]

Hey guys i have a silly question? Would5.7 heads fit onto my 5.3 block and if they do will it produce more power for me? Or if i get the 5.7 heads will i have to bore my block to a 5.7? Any help would be greatful

[DBYRD]

idk about the 5.7, but many people love the 6.0 heads for 5.3's. someone will jyump in and answer this better for u just thought id throw that out there.

[RedHeartbeat]

I would answer but all my reference material is at home and I am away for the weekend. I know they'll bolt right on. I can't remember the compression volume differences. I believe the valves are the same sizes but I can't swear to it.

[98vortecbw]

<div class='quotetop'>QUOTE(RedHeartbeat &#064; Sep 2 2006, 12&#58;51 PM) [snapback]63742[/snapback]</div>

I would answer but all my reference material is at home and I am away for the weekend. I know they&#39;ll bolt right on. I can&#39;t remember the compression volume differences. I believe the valves are the same sizes but I can&#39;t swear to it.
[/b]

Yeah I know they will bolt up but Im not sure about how it affects the CR either. You might want to check out ls1tech.com I&#39;m sure there is a thread about it.

Originally posted by goshawk23
you will get a little better flow from the 6.0 heads but you will raise the compression ratio with the 5.3 heads. i think the 5.3 heads flow 190 cfm vs 210 on the 6.0 heads.

Sorry I couldnt find a whole lot about the 5.7 heads.

[mongoose90584]

I jumping in here with a slight variation to his question. How would the stock ls1 heads also do?

[DBYRD]

shit i was thinking ls1 = 5.7 i mean the 5.7 has been ls1 or ls6 since what 98? haha damn im all confused&#33;

[RedHeartbeat]

Head CC with stock gasket in place...

LS1 = 66.67
LS6 = 64.45
LR4 = 61.15
LM4 = 61.15
LM7 = 61.15
LS9 = 61.16
LQ4 = 71.06
LQ9 = 71.06

All heads have 15 degree valve to piston angle.

LS1/LS6/LQ4/LQ9 intake valve 2.000"
All others 1.89"
1.55" exhaust valves all heads