naperws6

iTrader: (36)

I'm a noob and need your help I have been a member for years and I keep reading all theses posts about cam and head combos and im confused. My car is a 02 with ls6 intake a g5x3 cam with all the boltons and a moser 12 bolt with 3.73 gear and it put down close to 400hp on the dyno which I'm not to happy with. I want to be over 450 hp with a 92 fast intake and 92 TB and heads. I DO NOT WANT TO FLY CUT MY PISTONS so I'm looking for heads that will work with the g5x3 cam. I keep hearing about 243's which I would get ported and polished and got quated $800 to have that done plus buying the heads for $400 plus the new springs and rockers that's like almost $1800 which the guy doing the work will have before flow sheets and after he works for a repatible shop that he will do on the side and he guarantees they will out flow the competitor. Or I can due the Texas speed heads 215 I believe are 1300 plus springs or I can due there ls6 heads which are $2395 with springs or AFR heads which are $2500. All I want is not to fly cut the pistons and be happy putting down over 450 hp after the tune. I ask which heads are best for this g5x3 cam???? Any help would be greatly appreciated. Thanks

TXZ28LS1

iTrader: (5)

Since that is an LG cam, i know LG runs all their G5X cams with AFR heads. So i would opt for the AFR.

naperws6

iTrader: (36)

thank you for that info. Does anyone have experience with Texas speed heads the stage ls6 heads $1495 or the prc 215 head $2399???? How much power have u increased with these heads?

hammertime

iTrader: (1)

400rwhp with stock heads and a 12 bolt is nothing to sneeze at - how does your car run? Chasing dyno numbers can get expensive, and most believe a time slip over a dyno they don't know.

Heads and an intake can certainly get you there, but attention to detail is important too. That cam works much better with compression, so you are better off to run thinner gaskets and mill the heads to get it right. Flycutting isn't particularly costly or difficult, and may be necessary to get everything spot on, so why let that compromise your goal?

LG has run AFR heads with that cam for a long time. If your budget allows for it, why not get the skinny from them on exactly what it takes. Their website is full of results on C5 corvettes. The primary difference between your car and the corvette would be the headers and exhaust, but you should be able to come close with a well designed system.

If you haven't read it yet, The "recipe" to making 500 rwhp with just heads and cam explains a lot of what is required, including the exhaust.

Best of luck!

STAR

iTrader: (1)

I would suggest the TFS heads. The valves are rolled over (13.5 vs 15) and will provide more ptv clearance. They have proven to make big power and will easily reach your goals.

mike c.

iTrader: (1)

I ran AFR 205 heads on my ls1 with the x3 cam and made 463hp 414tq with a non ported fast/no ewp 12bolt w/4.11's. It was on a mustang dyno and i ran 11.1 123mph at 3,700lbs with me in it.

naperws6

iTrader: (36)

I will look into all the suggestions given. Thankyou anymore advice would be nice.

PREDATOR-Z

AFR 205s, 59cc and flycut pistons. Tested and proven combo.

JPH

iTrader: (2)

There 205s are old news now, the "new" V2 210s is where its at!

naperws6

iTrader: (36)

I see nobody is recommending the 243's which would be ported????????

hammertime

iTrader: (1)

While I am sure that it is possible to get similar results from ported 243 heads done by the right guy(s), we have no idea who your reputable vendor is. And as long as he operates the flow bench, he can of course 'guaranty' that his heads outflow any competitor. Unless you have access to others with solid results from his work, it would be hard to trust his opinion of his work - i.e. sales pitch. $1800 is a lot for 243 heads, not to far from what complete aftermarket castings cost.

The main reasons you are seeing recommendations for AFR heads are because they are (a) apparently within your budget (b) used by LG for repeatable results (c) CNC machined by a company that is well recognized and has delivered solid performance. Don't forget that flow bench numbers do not always equate to performance, especially where truth and advertizing are concerned.

If the shop is a sponsor, you may get more opinions on his work by posting the name. If not, is the $500 difference worth it? Only if his 243 heads outperform 95% of the other porters out there.

Rise of the Phoenix

iTrader: (27)

Do yourself a favor; forget the 243's and by some AFR's. Like PREDATOR-Z stated, proven combo, over and over and over again.

airforcemanss

iTrader: (23)

to the OP, this is a very proven combo.

I currently have a G5x3 cam on a 112lsa with afr 205's 59cc and the .040 cometic for the tight quench. you will have to be flycut which was quoted to me for 200. i plan on having my combo installed this winter. i bought this combo off a local which is a member on here. the afr springs are fine on the heads. i will sell the heads and gaskets if you are interested for 1600. if not, i will have them installed regardless but i figured i would throw it out there... i really want to go back to my procharged goals. had a kit last year i had to sell due to a move. PM me if interested and GL on your selection...

naperws6

iTrader: (36)

I really dont want to fly cut. but your heads are tempting. I will PM you

naperws6

iTrader: (36)

My tuner and builder keep telling me I should duecthe 243 and port them and with the 92 fast intake and a tune I should be In the 450 hp. I just don't want to due this again, I will be very upset if the 243 don't hit my goal. Has anyone here hit the 450 hp with ported 243???????????????

PREDATOR-Z

Yes provided the heads are well ported

dphc18

iTrader: (5)

I spoke with someone at LG 2 weeks ago and they told me with a G5X3 and AFR 210 heads I would not have to flycut, he said AFR heads have a recessed valve seat giving more ptv clearence.
I would call LG and ask about this!

hammertime

iTrader: (1)

Since you haven't searched for any info, here is what I was able to find.

LG Motorsports G5X3 CAM ONLY 405hp/375tq
99 camaro LS1, LS6 intake, 1 7/8 headers, bolt-ons ~ 405rwhp & 375 rwtq

G5x3 Cam Only
99 camaro LS1 with stock heads, LS6 intake, 12 bolt and otherwise similar mods to yours ~ 410rwhp & 386rwtq

DYNO RESULTS - Patriot LS6 style heads + G5X-3 cam...
02 camaro LS1 with PP LS6 heads (11.5:1), LS6 intake, 10 bolt and bolt-ons ~ 423rwhp & 389rwtq

G5X3 ’112’ Lobe Results
00 camaro LS1 with PP LS6 heads, LS6 intake ~ 447rwhp & 411rwtq

TEA Stg. 2.5 LS6 heads/G5X3 cam makes 447rwhp/400rwtq today
?? f-body, forged 347, TEA hand finished LS6 heads, 12 bolt w/ 4.10's ~ 447rwph & 400rwtq

Numbers near 450 with LS6 heads are rather exceptional. Since we don't know exactly what your base line is, you may have room to tweak what you have and bring the numbers up. More compression, better quench, intake and exhasut work, etc. Unfortunatley, stellar results don't often come from just putting all the parts together. See that link above about what it takes to dial in everything to achieve the best results.

One last note on PTV...from an authority on the G5X3

mike c.

iTrader: (1)

And if numbers are what you're after i still made 16hp and 14lbs tq more with AFR heads then all the gathered numbers above. I'm sure these were dyno jet numbers and i was on a stang dyno. Maybe i should of went to a jet to get higher numbers for post like this one.

vette0009

I agree *