I was wondering if it would be worth the $130 bucks to buy my friends dads ls1 heads to put on my truck when i have allen do the cam swap. What do yall think guys? Are ls1 heads better then 5.3 heads and if so by how much?
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I was wondering if it would be worth the $130 bucks to buy my friends dads ls1 heads to put on my truck when i have allen do the cam swap. What do yall think guys? Are ls1 heads better then 5.3 heads and if so by how much?
I THINK THE ARE. THE HAVE THE 2.0 INTAKE VALVE AND FLOW A LITTLE BETTER? THIS IS MY OPINION. I THINK IT IS THE SAME HEAD AS ON THE LQ9 6.OL. I DO NOT KNOW THE CHAMBER SIZE THOUGH?
YOU COULD ALWAYS GET A PORT AND POLISE JOB ON THEM. THAT BRING THE FLOW RATES UP SIGNIFICANTLY.
HEY I STILL NEED A RIDE IN THAT BEAST. I HAD TO LEAVE TOWN EARLY SORRY I DIDN'T CALL FRIDAY.
JAMEST
If it will ever stop raining we should try and get together Oh and by the way i got the info on car club. It is at the kroger parking lot and it starts at 730 and ends at 10
<div class='quotetop'>QUOTE(shwarmy @ Oct 16 2006, 09:32 AM) [snapback]69660[/snapback]</div>GOOD. I SAW MY FRIEND AND THEY SAID IT WAS A BIG TURN OUT. HE SAID THEY MOVED IT BACK KROGERS.Quote:
If it will ever stop raining we should try and get together Oh and by the way i got the info on car club. It is at the kroger parking lot and it starts at 730 and ends at 10
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JAMEST
It all depends. What are the casting #'s of your heads and the LS1 heads.
the heads will work but with your bore of 3.77 compared to the 5.7 3.9 the valves will be close to the piston wall. Been there done that lol.
oh yeah your compression will drop as well, your at 9.5.1 and will go to like 9.0.1 close to that anyways.
So your saying that the 5.3's have small valves. I thought they had 2.00/1.55's, I thought it was just the 4.8's that had small valves.
5.3 has smaller valves, keep the 4.8/5.3 heads. You'll drop compression, shroud the bore, lose torque, etc.
Still wanna do it?
Get them and deck them. I got mine and decked them 0.010 and cut the valve seats and took the humps out of the ports on the valve side. Love them. Retains stock compression and increases flow.
<div class='quotetop'>QUOTE(Chris Ryan @ Oct 19 2006, 10:20 PM) [snapback]70346[/snapback]</div>Quote:
Get them and deck them. I got mine and decked them 0.010 and cut the valve seats and took the humps out of the ports on the valve side. Love them. Retains stock compression and increases flow.
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When CC vol decreases, compression rises.
<div class='quotetop'>QUOTE(motoxlifer @ Oct 16 2006, 10:19 PM) [snapback]69842[/snapback]</div>I think they have the 1.890 intake and 1.55 exhaust. 4.8/ 5.3.Quote:
So your saying that the 5.3's have small valves. I thought they had 2.00/1.55's, I thought it was just the 4.8's that had small valves.
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6.0L , LS1, and I think the LS2 have the 2.0 intake and 1.55 Exhaust. If I am wrong someone please correct me so I will know in the future.
Jamest
<div class='quotetop'>QUOTE(Hit Man X @ Oct 20 2006, 02:51 AM) [snapback]70379[/snapback]</div>was i wrong the way i said it or am i misreading what YOU said?? just asking so i can be correctedQuote:
When CC vol decreases, compression rises.
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<div class='quotetop'>QUOTE(Chris Ryan @ Oct 20 2006, 06:46 PM) [snapback]70445[/snapback]</div>Quote:
was i wrong the way i said it or am i misreading what YOU said?? just asking so i can be corrected
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You shaved your heads 0.010... your compression rose.
GOt ya, I've always been told that the LS1's had bigger combustion chambers of course, therefore applying those to 5.3's would lower the compression. Any idea what the compression would be with my setup? That of which being 5.3 with ls1 heads and 0.010 deck
<div class='quotetop'>QUOTE(Chris Ryan @ Oct 20 2006, 11:39 PM) [snapback]70500[/snapback]</div>Quote:
GOt ya, I've always been told that the LS1's had bigger combustion chambers of course, therefore applying those to 5.3's would lower the compression. Any idea what the compression would be with my setup? That of which being 5.3 with ls1 heads and 0.010 deck
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Ah yes, 5.7 LS1 heads have what... a 67cc chamber and I think 4.8/5.3 have about a 62cc. Actually your compression probably dropped, even with 0.010 removed. And hurt midrange torque as the intake valve are too large now.
LS1 heads are 66.67cc with 2.00 and 1.55 valves
5.3L truck heads 61.15cc with 1.89 and 1.55 valves
Sounds like the 5.3 head would be better with a little bigger intake valve.
<div class='quotetop'>QUOTE(RedHeartbeat @ Oct 21 2006, 08:54 AM) [snapback]70515[/snapback]</div>Quote:
LS1 heads are 66.67cc with 2.00 and 1.55 valves
5.3L truck heads 61.15cc with 1.89 and 1.55 valves
Sounds like the 5.3 head would be better with a little bigger intake valve.
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I wouldn't go larger with a 3.78" bore.