Need Help Choosing Heads
Thread Starter
Pro
Joined: Jul 2007
Posts: 634
Likes: 1
From: dover de
Need Help Choosing Heads
hey guys if anyone could give me some advise i would really appreciate it i am currently in the market for new heads. i dont wanna go nuts and get tfs tea or afr im lookin more or less @ prc ls6 stg1, prc 5.3 2.5's or livernois stg1/2 does anyone have any advise on which head i can expect the most power from top end...i currently have a ms4 in the car and stock 243's with dual springs and chromoly 7.4 rods...my question is...1)i dont wanna flycut...which head will work
2)what head will put out the best numbers up top
3)what kind of gains can i expect with anyone of these heads over stock 243's?
ps..with this cam i should probably be looking for midrange power i know but im lookin for overall power...i currently make 443 403 on mustang dyno...i will be havin my fast 90/90 ported and 25% ud pulley put on what do you think i will put down?
2)what head will put out the best numbers up top
3)what kind of gains can i expect with anyone of these heads over stock 243's?
ps..with this cam i should probably be looking for midrange power i know but im lookin for overall power...i currently make 443 403 on mustang dyno...i will be havin my fast 90/90 ported and 25% ud pulley put on what do you think i will put down?
Safety Car
Joined: May 2006
Posts: 3,799
Likes: 1
From: Northern Virginia
St. Jude Donor '08
^^I think this is good advice. With a cam that big you do not want to reduce the combustion chamber size because you will run into piston to valve clearance issues. A set of ported and polished 243 heads should flow nicely.
Race Director
Joined: Sep 2005
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From: Pasco WA
Thread Starter
Pro
Joined: Jul 2007
Posts: 634
Likes: 1
From: dover de
i talked at length with both texas speed and livernois basically as long as the valves are the same size i will be in the same situation i am right now not sure wether either are milled though. my only concern is that i wont get very much from the stg 1 heads im hopin to get at least 35rwhp from them is that possible?
Melting Slicks
Joined: Sep 2002
Posts: 2,329
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i talked at length with both texas speed and livernois basically as long as the valves are the same size i will be in the same situation i am right now not sure wether either are milled though. my only concern is that i wont get very much from the stg 1 heads im hopin to get at least 35rwhp from them is that possible?
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Supporting Tuner
Joined: Apr 2004
Posts: 1,227
Likes: 28
From: Dearborn Heights MI
Thanks Dennis!
I'm sure our stage 2 heads will meet your needs. We're currently offering a GP on these heads if I can get 10 or more by the end of the month. The GP can be found here
Below, you can see the flow numbers and specs:
Specs:
- New GM 243 casting
- 5 axis CNC machined
- Fully assembled
- 220cc Intake Runner
- Intake Flow Rate 305 CFM
- Exhaust Flow Rate 235 CFM
- New 2.000 intake valves / 1.550 exhaust valves
- GM valve seals and locks
- Livernois dual coil valve springs good to ~ .690 lift
- Manley titanium retainers
- No core required
Thank you
Regards,
Rick LeBlanc
Livernois Motorsports
Melting Slicks
Joined: Dec 2005
Posts: 2,291
Likes: 0
From: sterling ct
to be honest, if your making 443 to the rear tires now.... i dont see how you will gain anything...i spoke with cartek and vett dr's on several occasions....most of them agree 450 is about it with a mild cam and "ported ls6 heads"
Melting Slicks
Joined: Dec 2005
Posts: 2,291
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From: sterling ct
from another post
Typically we see about 100 RWHP gain from Stage 2 Heads, our Stage 2 Cam, Kooks Longtube Headers & X-Pipe w/ Cats, and CAI.
Please see the graph below from a 2005 C6 6-Speed
this is from livernois post on his 243 heads for sale
- your already 440????? i would try a different dyno...i dont see how you are there with just a cam.
Typically we see about 100 RWHP gain from Stage 2 Heads, our Stage 2 Cam, Kooks Longtube Headers & X-Pipe w/ Cats, and CAI.
Please see the graph below from a 2005 C6 6-Speed
this is from livernois post on his 243 heads for sale
- your already 440????? i would try a different dyno...i dont see how you are there with just a cam.
Supporting Tuner
Joined: Apr 2004
Posts: 1,227
Likes: 28
From: Dearborn Heights MI
It depends on his cam and other supporting bolt-on's. Our dyno is said to be somewhat conservative. A stock C6 Z06 typically makes 440 RWHP and a stock C6 6-Speed typically makes around 340 RWHP.
Regards,
Rick LeBlanc
Livernois Motorsports
Regards,
Rick LeBlanc
Livernois Motorsports
from another post
Typically we see about 100 RWHP gain from Stage 2 Heads, our Stage 2 Cam, Kooks Longtube Headers & X-Pipe w/ Cats, and CAI.
Please see the graph below from a 2005 C6 6-Speed
this is from livernois post on his 243 heads for sale
- your already 440????? i would try a different dyno...i dont see how you are there with just a cam.
Typically we see about 100 RWHP gain from Stage 2 Heads, our Stage 2 Cam, Kooks Longtube Headers & X-Pipe w/ Cats, and CAI.
Please see the graph below from a 2005 C6 6-Speed
this is from livernois post on his 243 heads for sale
- your already 440????? i would try a different dyno...i dont see how you are there with just a cam.
Instructor
Joined: Feb 2008
Posts: 229
Likes: 0
From: Rockland NY
my buddy dynoed 459 uncorrected, and finished with 448 rwhp weather corrected, he has AR headers with cats, Hurricane intake, the HPE type S Cam, and underdrive pulley.. thats just cam only with necassary valvetrain upgrade, with no head work, or intake manifold work..
im doing same thing but have LG pro headers, and Stinger intake, but im going with a MS3 cam and the livernois stage 2 heads, and underdrive pulley, i should see about 470 rwhp
im doing same thing but have LG pro headers, and Stinger intake, but im going with a MS3 cam and the livernois stage 2 heads, and underdrive pulley, i should see about 470 rwhp
Instructor
Joined: Aug 2005
Posts: 176
Likes: 0
From: Atlanta Georgia
i agree, numbers sound fishy for a mustang dyno... dynojet? i can see it with an ms4, maybe under the right conditions/parts. but on a stang dyno? eh, thats iffy... hmmmmmmmmm... not calling you a liar, but the numbers are high for a mustang dyno with your mods. dynojet, i could believe.
Thread Starter
Pro
Joined: Jul 2007
Posts: 634
Likes: 1
From: dover de
it was at evolution performance in pa the guys with the 1st 9sec 2007shelby cobra it was definitly a mustang dyno i doubt they would inflate their numbers being so reputable but who knows either way i need new heads just lookin for the right ones
Thread Starter
Pro
Joined: Jul 2007
Posts: 634
Likes: 1
From: dover de
guys bottom line this car hauls. fran @ race proven motorsports built it and i ran a best of 11.9 @ 126 with a 2.2 60' on STREET TIRES. when i first had the ms4 put in it was somethin like 405 390 and ran a 12.0 @120 and that was just longtubes and a cai still stock ls6 intake manifold. and 78mm tb with a 2.2 60' dont believe me? aski him his shop is Race proven motorsports on ls1tech also now its got a ported fast 90/90 25% underdrive pulley and im gonna order the livernois stg2 heads really soon...i cant wait to see what this thing does!! and yes i know a 2.2 60 sucks but i got my bfg drag radials on now havent tracked it yet since those were put on tho.
Last edited by badazzEBz06; Mar 16, 2008 at 06:11 PM.