FU_I_AM_UltraZ

iTrader: (20)

Does anyone here have or know someone with 243 heads and LS6 or LS2 or FAST 90 or 92mm or even the LSXR intake that went from the 228/230 SS2 cam to the 238/242 SS2 cam on an LS1, LS6 or LS2 car? Preferably a t56 car.

I'm will be building a 6.2L with true 0821 LS3 heads in the future for my 98 WS6 t56 with 4.10s.. But I have a couple LQ9 engines to build up (one is an LS swap) to finish up before I can spend the time on 6.2 build. But a cam swap to added 20-30whp more in the meantime to hold me off... I don't mind doing over a weekend. Since I have a 2pc timing cover, pac 1219 beehives and wouldn't mind changing out cams again if I'm literally just changing the cam. I have ported 243s and running the ole 78mm FAST intake. I recently (mid Aug 2023) acquired a FAST 90 and Holley Sniper tb. So will be adding a larger FTP air lid, 85mm Z06/truck maf and L67 injectors before doing the retune. A big might.. Changing out my pacesucker 1.75in long tubes to some 1.875in long tubes.

So if you have a SS2 cam or SS3 in your n/a LS1, LS6 or LS2 car, please put your dynojet #s in the comments.
I know the ss3 cam is more a max effort cam vs the ss2. And although my car is "1 of" my DD'ers, its not my only dd vehicle. I have a lil fleet of "toys". But I won't and will not hesitate to jump in my 98 WS6 amd drive across the state for a 200+ mile round trip. Otherwise, I do have a couple "max-effort" camshafts for cathedral ports laying around. Noise obviously doesn't bother me. I do have tinnitus in my ears and some diminishing of hearing from between my time serving in the Marines and being a professional musician.. But don't want to run a cam that is going to beat up my valve guides before I care to redo my heads lol.

Thanks in advance,
-UltraZ

68Formula

The LS3 head flows great on the intake, not so much on the exhaust. So you don't need a lot more intake with the LS3 heads to pack in the air charge, but could use more on the exhaust side to evacuate the cylinders and really make peak power. The SUM-8710R1 230/242 113+3 would work very well with the 4.10s. It'll make more peak than your current cathedral port configuration, but even more with the LS3 heads swap later on.

G Atsma

I don't think there's a good-flowing exhaust port on ANY LS head. At least that I've heard of...

68Formula

Actually it's not that the exhaust ports don't flow well, it's the intakes flow extremely well for a small block. Hence a little more exhaust duration is helpful, especially on the rec port heads.

G Atsma

You are right. IF the LS had intake ports like most other engines, the exhaust ports would be alright.
BUT, even in the 706 heads, the intake port is pretty good, and gets way better in the "bigger" LS heads. THEN, the exhaust ports suck by comparison.

Bspeck82

Exhaust flow doesn't suck. Well, actually it does literally. Exhaust is always under way more pressure than the intake charge. Exhaust Valve flow doesn't need to be as good. Flowbench numbers don't simulate the dynamics of the engine. There have been extreme race applications where a 1.6 valve is replaced with a 1.59 and moved over just to put a bigger intake valve in there and gain more power.

FU_I_AM_UltraZ

iTrader: (20)

You got it backwards... the intake sucks and the exhaust blows. The engines like a vacuum cleaner. It sucks air in and the exhaust blows out

FU_I_AM_UltraZ

iTrader: (20)

So nobody is using any of these cams that have a dyno sheet or info of any kind? These cams have been around for so long, somebody has to have some data somewhere.

And about the exhaust flow on the cyl heads that everyone is bringing up to attention.. Guess i left out that both set of 243s and 823s are ported with factory valve sizes. So they flow enough to handle any stg3-4 camshaft.

99 Black Bird T/A

iTrader: (4)

FWIW - here's my experience might be of interest.

Before the TFS Sloppy SS2, back in 1999-2002 there were other less famous cams with somewhat similar specs. Here's two examples.

1) Futral Motorsports F13 cam
230/232 591/585 112 + 4

2) Morgan Motorsports 229v2.1
229/229 .578/.578 114 + 2

Both could lay down ~440+ whp in a well optimized set of the early 2000's in an an automatic and a little more in a manual. There was a pile of data on this back in the day but pictures of dyno graphs was fairly rare ie no smartphones etc.

Most of what I've seen suggests cams with similar specs are usually pretty similar if the lobes are the same or in the ballpark.

My 91 RS CamaRS's LS1 383 has the Morgan Motorsports 229v2.1 cam, with TEA LS6 Stage 2.5 heads hand finished by Brian Tooley back in 2003. The car has a 90mm snout LS6 intake manifold and 1 7/8 headers with twin cutouts off the headers & a Y pipe. T56 & 8.8 rear w/4.11 gears.

465 whp & 442 wtq

LS1 strokers seem to make same whp as the stock displacement LS1 with ~40 wtq more about 500 rpm lower.

I think ~465 whp is about what a TFS Sloppy Stage 2 will get you. Make a hair more or less etc

I'd GUESS the 238/242would be worth ~15 to 25 whp more IF the heads and intake you have can support the airflow. The fat MS3 sized cam gets old fast in a stock cube LS1 according to the folks I’ve know face to face that had them. Might be ok for a car that's seldom driven etc

FU_I_AM_UltraZ

iTrader: (20)

Thank you 99 Black bird... Finally someone who gives me useful data vs bitching about cylinder head ports 🤣🤣🤣
Such a shame really. Almost should be a crime being a blabbering buffoon SMH..


So here's where I sit. I have, nib Elgin ss2 cam. Have a fast 78mm on my car now. Along with other mods etc. I have a ported Dorman LS2. But just acquired a FAST 90mm and Holley sniper 92mm tb. So, i already ported my 243s with stock valves. And no, not some backyard hack job. I do porting on the side. My heads may not break records for ported oe cast heads.. But well worth my prices I charge. Back to the FAST 90 intake.. I'm going to do some mild port work to runners, taking down that notcthat sticks out etc. Also going to open the snout a lil more and blend tb to intake snout for smooth transition so no flat, squared wall obstruction from tb to intake.. Going to use the L67 Delphi injectors and GM 85mm truck/Z06 maf, larger air lid etc before the retune to make it worth while. Cam swap should take a day since I have a 2pc timing cover and already have pac 1219 beehives. Only thing might be doing to get ready for the motor planning to install in the future (which have recently acquired a 6.2 long block).. Changing out my long tubes from 1.75in to 1.875in primary long tubes. So, obviously not trying to acheive any max-effort, record breaking stock shortblock LS1 #s.. But if i can hit 440whp and over 400wtq... I will be very happy!!

wannafbody

iTrader: (2)

This isn't quite accurate. The exhaust port doesn't suck the fuel/exhaust gasses out. They are pulled out the headers and exhaust by a venturi effect.

Ditch the Holley Sniper and get a Holley Billet throttle body with the taper bore. It will tune better.