Tuskyz28

You go put those Dart heads you have on a 416ci motor ?

redbird555

iTrader: (14)

Not trying to discredit you but I find that very hard to believe, 241s even in ported form arent "fantastic" heads. I would have to see 2 combos go back to back anyway to really validate a difference. I made 400ft lbs on my old bolt on ls3 at 3500 rpm but again with no direct comparison its hard to make a determination

redbird555

iTrader: (14)

Maybe at the crank it does, which would likely translate to 10-15 whp. Thats also not taking into the account the lower compression of the ls3. So given that you would think the ls3 should only be about 10whp better than an ls2. But thats not the case. Compare a bolt on ls3 to a bolt on ls2 and as I said the ls3 dominates it everywhere

KCS

iTrader: (20)

Here's my build thread:

https://ls1tech.com/forums/generatio...ron-block.html

The dynograph with the slipping clutch:



Pat G has posted plenty of LS3 combos that have gone on his dyno to compare to. Frankly, I'm tired of this argument. It always ends up the same way, where cathedral guys testify that they make better low end power and the LS3 guys dismiss it all as poor cam selection. Nothing ever gets proven or resolved, just back and forth bickering.

If you,"Big Hammer", really want to know what people have against LS3 ports, just go back and read all of the threads that have already been started to argue the case. No need to beat the dead horse over and over again.

big hammer

I would consider almost 800 hp NA on a stock CI 6.2 with ported ls3 castings "figured out"?

big hammer

When it comes to stock cathedral castings on larger engines maybe. I do still like the torque ports though. I have a sweet set of Gmpp 243's I'm going to put on a 6.2

Tuskyz28

Not trying to knock that build as my buddie been told me about it but let's look at that combo overall and how it performs.
Car weight is 2800-2900 lbs fox body
Compression is 12.5:1
That​​​​​​ intake looks to be the mast unit which is a single plane intake
Car trapped 138 mph in the 1/4
Camshaft is way over 270 @ .050
I'm sure it'll do well with a 5k to 6k stall
Richard​​​​​​ Holeder already proved awhile back that a intake swap alone can be worth 60 horses.
That's​​​​​​ rolling on naturally aspirated period and I respect it as I love all motor builds.

However a fox body mustang is 600 lbs lighter than a F body car on average.
Everybody know less weight is always better when drag racing.
It's some cars on board here with 376ci-416ci that traps 130 mph in the quarter with a F body platform using cams with 240-250 duration camshafts that's not gutted out with a better steetable fast type intake that's below 12.0 compression. Hell its even a 402ci car that traps 131mph on a 17 inch drag radial and weighs 3750 with the the driver!!

Basically what I'm saying it's not hard to get 8 mph out a car with a 600 lb weight difference and more compression not to mention a better Valvetrain and intake which I already mention. Me personally I know which one I rather have on a long trip or on a hot sunny day. To each has his own tho....

big hammer

So the ls3's went a lot faster interesting

Rise of the Phoenix

iTrader: (27)

I'd like to see how my heads would do on a 416 cubic inch setup compared to say a set of MAST LS3 heads. I bet it would be very close.

Tuskyz28

Want a cookie with your glass of milk?

Again its not hard to go faster with your fox body weighing 2800 lbs vs a F body that's 3600 give or take. Take a stock ls1 and put it in a fox body and you have a 11 sec car already.... not going to happen with a F body.

SoFla01SSLookinstok

http://www.hotrod.com/articles/ccrp-...re-port-heads/

http://www.superchevy.com/how-to/ght...-head-to-head/

ragtopz28

iTrader: (57)

My buddies SBE 6-speed (headers and tune only) runs 11.1 @ 119.95, but it is ~3,000#

Tuskyz28

That's rolling but 2800lbs vs 3500-3600 plus lbs. Big difference there. 3000 vs 2800 pounds.... not so much.
​
Go to a drag racing calculater and calculate 600 hp in a car that's 3500 pounds then calculate 600 hp in a car that's 2800 pounds. I bet it's more than a 8 mph difference between the two setups.

pantera_efi

iTrader: (1)

Hi BlackBird, thanks.
I worked at HMS where we developed the BOSS 302 head for T/A racing at 9500 RPM based on knowledge we learned from the Ford 302W Tunnel Port.
I was the first to cast/sell "tongues" for use in the 351C for my Pantera customers.
I was the first to "hi-port" the Boss 302 for use in my Ford powered Lotus F-5000 at 620 HP when ALL the BEST Chev's could only produce 550 HP.
I worked with Tony Otto welding the A-3 head, filling the intake port, that BECAME the C-302 head at 625 HP.

LATER in my life I had the help of John Drake, the builder of the MOST SUCCESSFUL racing engine TO THIS DAY.
THUS my concern, the direction of the thread.
The comments above, the "tech" is mostly correct.
What is not covered well the the end use.

MY EXAMPLE is the Drake Offy, the SDG mods, AND BOOST !

What I state, with observation of the Offy block, BOTH the intake/exhaust ports where the almost same size as where the valve sizes.

The direction of the thread could be ONLY N/A engine requirement ?

WHEN I READ the above comments, when I had little experience, I would GUESS the SAME comments would APPLY to a S/C or Turbo application.

THIS IS NOT THE CASE.

My direction for LS-1 Tech members is to know this fact, not to criticize the good above information provided.

Lance

Tuskyz28

I just did that..... no need for no one else to even figure it up.

2800 lbs , 600 horse , 138 mph, 9.7 e.t

3500 lbs , 600 horse , 130 mph, 10.4 e.t

Most guys on here cars weigh over 3500 lbs with them in the car espically if the car is leather loaded with power windows.

1bdbrd

iTrader: (12)

This might be a case like the old TPI engines where too small of a head and intake will "artificially" make torque production down low stupid easy. You can see it in the dyno chart, that engine is done at 5000 rpms. It would make a sick truck engine to punch around town with but it sucks as a performance car engine. My old TPI car made 360wtq at 2k rpms with headers and catback only but like his, it was done at 5k and petered off pretty quickly. It made a great stop light car but if the race went more than 1/16th of a mile it was over for me against actual fast cars.

KCS

iTrader: (20)

If you're talking about my car, the engine wasn't done at 5k, the clutch was. At that RPM it was literally as if you pressed in the clutch peddle. I suspect that's why the torque was so flat as well.

64post

iTrader: (5)

Truck motor? You mean tug boat vs. Formula 1

big hammer

I don't know what you're so upset about. The ls3 heads went faster and they should. They're a superior design for HP over stock cathedrals

big hammer

How about 9.20's howdy doody