YenkoST

iTrader: (10)

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Just looking to see how people like them and if anyone is running them with power numbers/track times. I had their 195cc Eliminators in my SBC a long time ago....looks like they require aftermarket rockers??

Patron

I've seen a few guys with them over on YB and that's TFS Ls3 heads. No track times. They would be in the same HP and ET range. Same head that has a smaller port than the Factory. You could refer to Factory Ls3 heads and think better or quicker ET.

Is it for the truck Skunkworks? If so are you wanting NA or FI you could ballpark it and factor what heads are being used VS what's wanted. Plenty of builds & Times/ET from this site and others.

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On the Rocker Arms Comp Cams makes the Pro Magnum stud mounted rockers take your choice adjustable on Non. Way better than the factory cheap $450 -500. Forgot how much I paid for mine. I went with the Adjustable for factory Ls3 heads.

Patron

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Cheaper than I thought.

YenkoST

iTrader: (10)

Yeah, its for the 1990 C1500 with a F1x Procharger.

Patron

Ok..... The AFR/TFS heads would be good most tend to like Cathedral style heads on FI. Your best bet is to get with Lil John Motorsports or B. Tooley as this is what they do! If you get the rear suspension/ trans&stall correct it could be crazy. Depending on how much you rev and boost it. LSA/Ls3 heads could be be considered also.

big hammer

Aftermarket ls3 heads have MUCH better port efficiency than stock. A lot better for a street/strip engine. For all out HP worked stock ls3 castings can make some wicked hp but they do have their shortcomings

Jimbo1367

Some needs to step up and build a LS3 416 with AFR LS3 heads.

Patron

Jimbo what be'd the difference in TFS ls3 heads? Honestly. Same basic features and close runner size. The build would be a reflection.

Darth_V8r

iTrader: (4)

I would bet the differences between the TFS and AFR are almost academic. Typically, AFR has less intake bias on their flow vs TFS, but I haven't seen the numbers for these heads side by side yet.

Either head would be great on that 408 you were putting together!

Patron

Darth you know your my N***a right LOL! I've never felt or like the aftermarket as it's basically a repo of what I can get cheap from the factory. IDK the exact cost of either but with $600 just in springs and a FRH cnc program I didn't spend over $2300 complete. Now would AFR/TFS heads make more HP? YES. But at a additional cost. Would it be worth it to some maybe, to me know. I'm not a TQ lover nor factory intake lover. 30 hp difference in Ls3 head testing on a 468 I'm sure it would be less with a smaller 408. My thinking goes like this: Any aftermarket head will still need to go out for improvements. I know AFR ls3 heads are $2k bare add in bowl work and the short side radius we're at like $3k. Did the heads in my sig for around $2600 that's for welding and porting while being Ls7 heads. These would be better than anything listed.

AFR Ls3 heads
260cc Street Head Flow Chart
.200 .300 .400 .500 .600 .650 .700
Int 159 234 293 336 366 377 384
Exh 112 158 207 235 248 251 255
Test conducted at 28" of water (pressure) on Superflow 600
Bore Size: 4.155", 3/4" radius plate exhaust, 1 3/4" curved pipe

TFS:255 LS3 heads/ Flow Data w/4.065" Bore Plate
Lift Intake Exhaust FLOW DATA: CFM AT 28 INCHES LIFT INTAKE EXHAUST
0.100 71 59
0.200 146 113
0.300 231 171
0.400 294 215
0.500 334 240
0.600 363 252
0.700 382 258


FRH Stage1 268cc heads Factory Ls3 heads: 4.065 test bore
Int. 2.165

.200/159
.300/237
.400/282
.500/338
.600/368
.700/388
.750/390

Ex 1.590

.200/120
.300/190
.400/225
.500/242
.600/250
.700/255
.750/257

Darth_V8r

iTrader: (4)

I know man. I was just poking ya. I knew the answer before I posted

TrickFlowTech

Note the test bores, ,400 lift numbers, and the CSA's we've used to achieve that flow. Those aren't small differences in terms of power. And rolling over the valve angle is important vs. factory heads. CNC'd LS3's always make less power than their flow numbers would suggest.

Patron

That's funny as a lil 414 making 750+ on pump gas with Nothing special making more than what I've notice here on more than the avg. builds. Made more HP than what the flow suggested and CHEAPER. I understand that TFS or AFR,MAST,All Pro...etc heads are better. But the comment that Factory Ls3 heads Makes way less HP is a bunch of Sales BS. FACT! We making 800 with factory sized 376's. CHEAP!

TheeCamaroKid

Patron

No popcorn needed brother. As anybody who knows something about a engine we can make anything make HP and or TQ. The old factory 350 or gen 1's have crappy heads 23 deg. We now start at 15 degrees from the factory and the aftermarket does even better with better valve angles and smaller ports. Yes the aftermarket is better but it's not some HUGE leap as it's a Copy of factory *hit. Yes you can get a out of the box TFS head and make HP. Someone could get Ls3 factory heads and have work done and make HP also. If you got the money spend, if not don't feel like it's a loss to use factory heads. It's no huge loss well maybe in TQ but camming can correct that as much as possible. If you've got $ to go buy a aftermarket Ls3 head and buy it. Just think about it for a second and Ls7 heads are available @ the same cost. Think about it again takes some time for some to get use to. Hell on the lower end of the spectrum for HP under 850ish aftermarket cathedral heads do about what either head does just doesn't have enough CSA or raised runner which help. Better or more efficient ports need less camming to make the same HP. It's all about the CSA for the RPM needed. Less is better but if it's a little large we can work with that Also. Dart Ls3 heads start off at 280cc and they do well.

NAVYBLUE210

The statement by Trick Flow TECH was

"CNCd LS3 Heads always make less (NOT WAY LESS)
power then their flow numbers would suggest."

When one misquotes and makes emphatic statements related
to that misquote, one appears Arrogant, Condescending &
Dismissive, not a good look especially for a vendor.

KW Baraka

iTrader: (7)

You forgot; "desperate".

KW

Patron

Neither post holds any weight. Oh I bought this from such and such and it must be the best as he did them BS. As I said it's a copy. Ask the aftermarket why in the hell didn't they add better features instead of the BS they sell or sold you on, Oh we rolled the valves BS. While they were rolling the valves they should have splayed them or added some type of cant. Oh Mast was gonna make it.... But decided not to as it would cut profits with Canted or splayed valve Ls3 or Ls7 heads. No need for the high end stuff. I cut BS as I'll make it or have things made myself. The word: Way was a figure of speech for a cry baby to find fault with. Carry on. Hell Anybody can angle mill a head and roll a valve.

NAVYBLUE210

Absolutely!
LOL

G Atsma

According to you. ONLY.
Somebody here is a legend in their own mind....