853's vs 243's
Look at this thread titled, "853 vs 241 heads" (I know it sounds familar);
https://ls1tech.com/forums/generation-iii-internal-engine/666164-853-vs-241-heads.html
Start searching!
https://ls1tech.com/forums/generation-iii-internal-engine/666164-853-vs-241-heads.html
Start searching!
Moved from Advanced Tech section.
The 853 heads came standard in most '97-00 LS1s. They had 67cc combustion chambers. They were superceded by the 241 castings, but the flow and performance were virtually identical.
The 243 heads were introduced for the first time in the '01 Z06 Corvette. They featured higher flowing ports, smaller combustion chambers, and for the Corvette only, they also had lightweight valves. Today, the 243 head is used in many GM applications from the LS2 engines used in C6, GTO, Trailblazers, to the 4.8 and 5.3L motors in GM trucks and SUVs. They are a nice step up in power compared to the 853 heads.
The 853 heads came standard in most '97-00 LS1s. They had 67cc combustion chambers. They were superceded by the 241 castings, but the flow and performance were virtually identical.
The 243 heads were introduced for the first time in the '01 Z06 Corvette. They featured higher flowing ports, smaller combustion chambers, and for the Corvette only, they also had lightweight valves. Today, the 243 head is used in many GM applications from the LS2 engines used in C6, GTO, Trailblazers, to the 4.8 and 5.3L motors in GM trucks and SUVs. They are a nice step up in power compared to the 853 heads.
__________________
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.
Well, nevermind on my above post, but do keep searching.
The 243s are wider at the SSR and the bowl is notable larger. They lend themselves to more flow with those changes. The roof is trajectory shaped (LS1 head is not), the swirl vane is less pronounced, and the exhaust ports are D-shaped.
They're worth good power over a LS1 head. LS1 heads all perform the same with a VERY small difference from 853 to 241 casting.
Ben T.
The 243s are wider at the SSR and the bowl is notable larger. They lend themselves to more flow with those changes. The roof is trajectory shaped (LS1 head is not), the swirl vane is less pronounced, and the exhaust ports are D-shaped.
They're worth good power over a LS1 head. LS1 heads all perform the same with a VERY small difference from 853 to 241 casting.
Ben T.
Originally Posted by QSPres
Thanks Patrick. I just wanted to make sure there weren't any significant differences in the short turn radius or anything along those lines....
Ben T.
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Stock LS1 Heads
Chamber 66.67 cc 0.100 0.200 0.300 0.400 0.500 0.550 0.600
Intake 200 cc 67 122 178 215 219 223 227
Exhaust 70 cc 52 97 133 156 170 176 180
Valve Diameter Intake 2.00"
Valve Diameter Exhaust 1.55"
Part Number 12559853 (1997-98)
12559853 (1999-00)
12564241 (2001-03)
Stock LS6 Heads
Chamber 64.45 cc 0.100 0.200 0.300 0.400 0.500 0.550 0.600
Intake 210 cc 62 126 184 224 251 256 257
Exhaust 75 cc 57 108 143 163 176 180 183
Valve Diameter Intake 2.00"
Valve Diameter Exhaust 1.55"
Part Number 12564243 (2001 +Z06)
Chamber 66.67 cc 0.100 0.200 0.300 0.400 0.500 0.550 0.600
Intake 200 cc 67 122 178 215 219 223 227
Exhaust 70 cc 52 97 133 156 170 176 180
Valve Diameter Intake 2.00"
Valve Diameter Exhaust 1.55"
Part Number 12559853 (1997-98)
12559853 (1999-00)
12564241 (2001-03)
Stock LS6 Heads
Chamber 64.45 cc 0.100 0.200 0.300 0.400 0.500 0.550 0.600
Intake 210 cc 62 126 184 224 251 256 257
Exhaust 75 cc 57 108 143 163 176 180 183
Valve Diameter Intake 2.00"
Valve Diameter Exhaust 1.55"
Part Number 12564243 (2001 +Z06)
