LS3 vs. L92 heads...whats the difference?
LS3s have hollow intake valves, and the newer ones have better valve springs with a little more seat/open pressure (the blue springs). The rest of the port/casting is the same.
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Your advice giving card has just been revoked. 
Wow this sounds like a mustang site with the newest 18 year old giving sound engine design advice.
Guess you need to call and start consulting for NHRA prostock. They have it all wrong.
Google is your friend not what your buddies uncle that worked in NASCAR told you.
Tim
Guess you need to call and start consulting for NHRA prostock. They have it all wrong.
Google is your friend not what your buddies uncle that worked in NASCAR told you.
Tim
The trend for making power over the broadest rpm range is to have the lightest, stiffest, strongest valvetrain you can. The lightest valves & rockers, the stiffest pushrods, the strongest springs. You need valve control along with fast opening and closing of the valves. Always go for the lightest valves you can afford that will last. Weight is the enemy and trust me, those stock L92 valves are HEAVY.
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2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2022 Cadillac Escalade 6.2L A10 S&B CAI, Corsa catback.
2023 Corvette 3LT Z51 soon to be modified.
Custom LSX tuning in person or via email press here.
2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2022 Cadillac Escalade 6.2L A10 S&B CAI, Corsa catback.
2023 Corvette 3LT Z51 soon to be modified.
Custom LSX tuning in person or via email press here.
So I take it the LS3 head would be the better choice of the 2? Trying to decide between the PRC stage 2.5 5.3 heads and the PRC ported l92's which I could order with the lighter valves for my LQ4 build.
Car is 3100# carb, th350, 8" converter and 4.10 gears.
Car is 3100# carb, th350, 8" converter and 4.10 gears.
Over the 5.3's yes. However, l92/ls3 heads might be too much for a smaller CI motor with a pumpgas friendly setup, out of the box they are 260cc intake runners. I personally wouldnt reccommend them (ported version) for anything less than 400 cubic inches.
Yeah I was gonna say unless you are building a stroker of some sort then you dont need them ported. I have a set of LS3 heads in the floor here and ordered another set last night due to a little issue. 821 or 832 heads are the same casting (like 243's and 799's), just depends on what the head went on as to what valve it got, least thats my understanding. There have been reports of Camaros having 823 casting heads but Im sure they have the hollow intake valve. Lighter is BETTER.
