PRC 5.3 heads better than LS6?
03-23-2012, 12:03 AM
#3
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The port/chamber design is better on the ls6's, but the 5.3's have a smaller chamber (higher compression). Usually the 5.3's are seen with large cams; this is most likely because less milling is required on the 5.3's, allowing sufficient ptv clearance while obtaining higher compression than possible with the ls6's. In this case the small loss of flow/efficiency is more than made up with by the increase in compression.
So unless you plan on a large cam, the ls6 is the better choice. As for bang for the buck... you decide. Also, the only difference between stage 1.0 and 2.5 heads is upgraded valves, generally only worth 4-6 rwhp. Just thought I'd add that incase you didn't know.
So unless you plan on a large cam, the ls6 is the better choice. As for bang for the buck... you decide. Also, the only difference between stage 1.0 and 2.5 heads is upgraded valves, generally only worth 4-6 rwhp. Just thought I'd add that incase you didn't know.
03-23-2012, 12:14 AM
#4
Had 5.3 2.5 on my TA with a 228r cam and I produce real good numbers 432rwhp with a ls6 intake maxing out 26#inj. Sold car to my buddy he trap 120mph in the 1/4 on stock 342 Full weight car
Edit: let me add when I sold car to my buddy I already add a ported fast 90/90 but never retuned it
Edit: let me add when I sold car to my buddy I already add a ported fast 90/90 but never retuned it
03-23-2012, 09:28 AM
#5
but the 5.3's have a smaller chamber (higher compression). Usually the 5.3's are seen with large cams; this is most likely because less milling is required on the 5.3's, allowing sufficient ptv clearance while obtaining higher compression than possible with the ls6's. In this case the small loss of flow/efficiency is more than made up with by the increase in compression.
The LS6's will make a bit more (and better average) power over the 5.3's all the way across the powerband because of their port design and layout.
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03-23-2012, 09:51 AM
#6
The PRC 5.3L heads get a CNC'd chamber in them, so they actually start at about 63cc. The LS6's start at 64cc (no CNC chamber). So that's really nothing to write home about. We can set either head up to clear a true flat-top piston with as big as our MS3 camshaft.
The LS6's will make a bit more (and better average) power over the 5.3's all the way across the powerband because of their port design and layout.
The LS6's will make a bit more (and better average) power over the 5.3's all the way across the powerband because of their port design and layout.
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03-23-2012, 11:49 AM
#9
We can mill them about .020" for the Torquer camshafts and retain good clearance on a true flat-top piston!
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COMP - FAST - PACESETTER - DIAMOND RACING - EAGLE SPECIALTY PRODUCTS - CALLIES - COMETIC GASKETS
RAM CLUTCHES - MOSER ENGINEERING - KOOK'S HEADERS - ARP - GM BOLTS AND GASKETS - MSD - NGK
POWERBOND - ASP - AND MORE!
Largest Stocking Distributor of LS-x Engines / CHECK OUT OUR NEW WEBSITE!
COMP - FAST - PACESETTER - DIAMOND RACING - EAGLE SPECIALTY PRODUCTS - CALLIES - COMETIC GASKETS
RAM CLUTCHES - MOSER ENGINEERING - KOOK'S HEADERS - ARP - GM BOLTS AND GASKETS - MSD - NGK
POWERBOND - ASP - AND MORE!
