241 or 243 or keep the 853 heads
Thread Starter
Joined: Apr 2004
Posts: 832
Likes: 1
From: Mooresville NC
241 or 243 or keep the 853 heads I just bought another Firebird tuesday. Its a 99 with a M6. I was looking around under the hood and seen it has 853 castings on the heads. My question is I have the 241's off my Trans Am would i benifit from having the 241's or the 853's ported up? My other option is to buy a set of 243's. I was just thinking since I have them what would be the difference in the 3? I'm sticking an F13 in it aswell when I start. thanks
!LS1 11 Second Club
Joined: Apr 2003
Posts: 7,133
Likes: 2
From: Miami
Send either the 241's or 853's to TEA for their Stage 1 program. Awesome mid lift flow numbers that rival stage II 243 heads. They peak around 295cfm at .550. I think it's less than aa grand if you provide the casting.
Or, 243 castings from PRC (at TSP) or Patriot 243's or Livernois 243's look great also, all checking in from $850 to $1150. These have great mid lift numbers, and carry past 300 cfm around .600.
Or, 243 castings from PRC (at TSP) or Patriot 243's or Livernois 243's look great also, all checking in from $850 to $1150. These have great mid lift numbers, and carry past 300 cfm around .600.
!LS1 11 Second Club
Joined: Apr 2003
Posts: 7,133
Likes: 2
From: Miami
Casting Number 853 or 241
LS1 (Center Bolt)
99-00 5.7L Passenger Car and Corvette (853)
01+ 5.7L Passenger Car and Corvette (241)
Material: Aluminum
Combustion Chamber Volume: 66.67cc
Intake Port Volume: 200cc
Exhaust Port Volume: 70cc
Intake Valve Diameter: 2.00 inches
Exhaust Valve Diameter: 1.55 inches
Casting Number 243
LS6
01+ 5.7L Corvette
Material: Aluminum
Combustion Chamber Volume: 64.45cc
Intake Port Volume: 210cc
Exhaust Port Volume: 75cc
Intake Valve Diameter: 2.00 inches
Exhaust Valve Diameter: 1.55 inches
LS1 (Center Bolt)
99-00 5.7L Passenger Car and Corvette (853)
01+ 5.7L Passenger Car and Corvette (241)
Material: Aluminum
Combustion Chamber Volume: 66.67cc
Intake Port Volume: 200cc
Exhaust Port Volume: 70cc
Intake Valve Diameter: 2.00 inches
Exhaust Valve Diameter: 1.55 inches
Casting Number 243
LS6
01+ 5.7L Corvette
Material: Aluminum
Combustion Chamber Volume: 64.45cc
Intake Port Volume: 210cc
Exhaust Port Volume: 75cc
Intake Valve Diameter: 2.00 inches
Exhaust Valve Diameter: 1.55 inches
You might checkout the info on our new outright PRC 243 LS6/LS2 heads! They sell for 849 a pair outright assembled & ready to bolt on! Sell your heads for $150 or so & your only out $700 doing ported heads!!
__________________
Jason
Co-Owner, Texas Speed & Performance, Ltd.
2005 Twin Turbo C6
404cid Stroker, 67mm Twins
994rwhp/902lb ft @ 22 psi (mustang dyno) www.Texas-Speed.com
Jason
Co-Owner, Texas Speed & Performance, Ltd.
2005 Twin Turbo C6
404cid Stroker, 67mm Twins
994rwhp/902lb ft @ 22 psi (mustang dyno) www.Texas-Speed.com
Here are some flow numbers on a set of our CNC ported 243 castings with stock valves. Heads were flowed on our Superflow 1020, 3.905" Bore, using a clay radius, and pipe. These are real flow numbers and you will recieve a spec sheet and a flow sheet specific to your set of heads.
.100" 75 / 62
.200" 154 / 121
.300" 215 / 165
.400" 254 / 200
.500" 285 / 217
.550" 292 / 221
.600" 301 / 226
We can do you a set of these bare for $845 or we can assemble them with 2.00"/1.55" OEM valves and LS6 springs for $865.00. If you use these heads, it will yield a 10.5-1 compression on a stock LS1 bottom end. We can also do any additional milling to these at no extra charge. If you have any questions, please let us know.
.100" 75 / 62
.200" 154 / 121
.300" 215 / 165
.400" 254 / 200
.500" 285 / 217
.550" 292 / 221
.600" 301 / 226
We can do you a set of these bare for $845 or we can assemble them with 2.00"/1.55" OEM valves and LS6 springs for $865.00. If you use these heads, it will yield a 10.5-1 compression on a stock LS1 bottom end. We can also do any additional milling to these at no extra charge. If you have any questions, please let us know.
Trending Topics
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
Topdon ONE vs. Artidiag 800 BT2: Which is the Diagnostic Tablet For You?
Pouria Savadkouei
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine
Verdad Gallardo
7 Most Reliable High-Performance Engines GM Has Ever Built
Verdad Gallardo
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin
Verdad Gallardo
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo !LS1 11 Second Club
Joined: Apr 2003
Posts: 7,133
Likes: 2
From: Miami
The 241's. Only because they're off your car already (assumption) and may be a bit better than the 853's with a similar port program. I'd make my decision with whichever head is easier to send them and bolt back on.
Originally Posted by dudas35
I have checked on the price of porting, it would be better to buy a set of already ported 243's instead of having yours ported. IMHO
I agree for the most part.
Unless you have TEA run the program said above.
The LS6 option is a damn good one, and for as cheep as it is you cant go wrong.
Also the 241's and 853's are the exact same after porting.
