Question on valve size of ported heads for boosted application
Thread Starter
TECH Apprentice
Joined: Nov 2001
Posts: 353
Likes: 0
From: Evansville, IN
Question on valve size of ported heads for boosted application Ok, I'm getting a set of 6.0L heads ported. The guy porting them says that I should stay with stock valves as that's enough for a 346ci engine. I was thinking about going with 2.055" / 1.60" instead. How much power difference would there be between the two? If I'm going to be getting it done, I want it done right the first time.
I'll be putting a blower cam in, 218/224 .530 .540 114ls or so in specs and next year I'll be putting on an ati blower. I already have tts headers(with crappy flowing cats) and a b&b tri-flow exhaust. I'm hoping for somewhere around 550-600 rwhp with stock cubes.
I'll be putting a blower cam in, 218/224 .530 .540 114ls or so in specs and next year I'll be putting on an ati blower. I already have tts headers(with crappy flowing cats) and a b&b tri-flow exhaust. I'm hoping for somewhere around 550-600 rwhp with stock cubes.
Re: Question on valve size of ported heads for boosted application There's probably 15 hp increase in power with the larger valves providing your porter balances the flow of the valve with the port (either one can become a restriction at high flow levels). The 1.60 exhaust valves are an especially good idea with the blown motor.
I hope you're talking about ported aluminum 6.0L heads...they're badass! They even flow more than LS6 heads up to .400 lift. Porters are finding incredible flow numbers, even with stock valves. SAM in Houston is getting 275 cfm at only .400 lift...that's huge! <img src="images/icons/shocked.gif" border="0">
I hope you're talking about ported aluminum 6.0L heads...they're badass! They even flow more than LS6 heads up to .400 lift. Porters are finding incredible flow numbers, even with stock valves. SAM in Houston is getting 275 cfm at only .400 lift...that's huge! <img src="images/icons/shocked.gif" border="0">
__________________
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.
Thread Starter
TECH Apprentice
Joined: Nov 2001
Posts: 353
Likes: 0
From: Evansville, IN
Re: Question on valve size of ported heads for boosted application Yeah, I'm talking about aluminum 6.0L heads. I figured they would work better with a blower since they already have a lower compression and they should flow more. I'm going to go ahead and get the larger valves since that should allow me to run less boost to reach my goals.
