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I picked up the LPE/GMPP cathedral heads from Land Speed on Monday, after being assured in detail they will not work out well for this build. If the chambers are opened to drop the compression the quench will be wrong for an NA build. Thank you to Land Speed.
This places heads back on the table.
ACDelco 12602477 - Intake Manifold is what I have and would like to use. I think this is the 92mm intake manifold used on the 5th Gen LS3/L99 SS Camaro. With the 99 TA having the older PCM, I'm very concerned a 102 set up won't be suitable as a daily driver.
Regarding Aftermarket cylinder heads, do any of the castings have porosity issues or other issues?
I've read else where at least one of the big named after market heads had problems.
What LS3 style head is the best bang for the buck?
This article seems a good starting point but the engine was a 468 much bigger than the 416 I'm having done.
I'm not aware of any porosity issues with trick flow, AFR, PRC, or Mast castings. Bang for buck tends to go to trick flow castings of the ones I just listed.
Best bang for the buck LS3 head is the GM factory head in my opinion. Those aftermarket LS3 heads seem to be a joke to me as ive seen alot of them produce only 10 horses over a out the box L92/LS3 cylinder head.
Needle bearing-FAIL. Bronze available there too? Don't know what your budget is like but if you're buying new heads and they must be square port, take a look at the TFS 255's, better bang for a few more bucks.
For a daily driver 416" non cathedral, I would want
260 CCs at max with a good E/I relationship.
TFS LS3s, Mast Mid Bore LS3s, or the SPS
Haymaker LS3s are interesting also with the
2.125" Intake Valve.
AFR LS3s should be out by end of May also.
Last edited by NAVYBLUE210; 05-03-2017 at 11:20 PM.
I have a stock LS3 intake, I would like to get it ported and matched to the heads.
Max of ~$3200 for heads, but probably less - not convinced there will be much difference between the heads on a 416 turning ~7000 to 7200rpm
The hotrod ported LS3 head test - they all seemed to make about the same hp
The tfs will gain the most between those 3. I guarantee it. Even out of the box. Add in someone massaging them etc? No contest.
They have a few articles out in camaros and vettes adding over 100hp with headers and a 230 238 tfs cam on both vehicles. Def not max effort builds at all but alot of gains. When utilized with a better engine, theyd be even more impressive.
TFS LS3 heads & 230/238 cam yield 450 rwhp on an LS3?
The torque is much better and most impressive part of the results to me.
I expected to see 485 to 495 out of that.
Is that a typical end result for that sort of H&C package?
Would adding 40 cubes to 416 would probably get this combo over 500?
Last edited by 99 Black Bird T/A; 05-06-2017 at 09:05 AM.
Adding 40 cubic inches.... will it crack 500 rwhp ? Maybe.... maybe not. Cam choice got a lot to do with it.
Speaking 408ci wise.. ive seen plenty not make 500 rwhp with LS3 heads and be stuck in the 11s at the track. I dont think 8 more cubes would make a difference between the two accept for the weight on the nose of the car.
The torque is the good part but i believe a better cam would make more power. Plus i believe they said they were using a conservative tune. Everything else was stock meaning no injectors, no ported intake or tb, no underdrive, etc etc. There are 2 such tests one on the grand sport vette and one on a 2010 camaro SS. Botb had nearly the same gains. Which shows you how consistent they are.
But you cant race a dyno. Like everyone wants, a before and after drag strip test would have been a better idea, or added that as well. Every dyno is different BUT like i said 2 tests had nearly the same gains. Not bad.
Those heads would open way up with a larger cid engine and a better flowing intake. Im pretty sure that is not just my opinion either.
TFS LS3 heads & 230/238 cam yield 450 rwhp on an LS3?
The torque is much better and most impressive part of the results to me.
I expected to see 485 to 495 out of that.
Is that a typical end result for that sort of H&C package?
Would adding 40 cubes to 416 would probably get this combo over 500?
Needs more Cam!
2 other dyno articles in Super Chevy, 416"s one peaked 622FWHP@ 6200 RPM
with 235/250, LME CNC OE LS3 Heads, & FAST, other peaked 576FWHP
@ 5800 RPM with 227/243, TFS LS3, with stock LS3 Intake.
Good info in both articles.
If I were building a Daily Driver 416" with TFS LS3 Heads out of the box,
I would have Cam Motion grind me 235-240* Intake Duration
depending if I wanted to peak @~ 6200-6600 RPM, +8-10* Exhaust Split
with 114*LSA+3*Advance with .610-.630" Intake Lift with -.020" less
on the exhaust with Stock Straub Trunion Upgrade RR, ~11.5:1 Comp
and either Ported stock Intake or Fast 102 with Standard length runners.
For LLSR add 6* to above cam specs for lash and use Fast Mid Length
Runners and add 600-800 RPM to Peaks, shift @ 7500+ LOL.
My .02 from someone who specced/had built an engine with TFS LS3s
and studied their build/results for a while.
Last edited by NAVYBLUE210; 05-06-2017 at 05:22 PM.
05-03-2017, 05:51 AM
