G Atsma

Why oh why, are using a distributor?? Coil on plug is SO much better..

Buryingthesun

can you explain why, I get this a lot but no one ever has a good answer beside "because thats what it came with" "C0mPuT3rZ ArE T3H FuTUr3"


EDIT: Im sure my power figures seem low, but it was built for durability and longevity not peak power being its going into a road race car.

G Atsma

Coil on plug is a straight electrical connection, with far better coil saturation time and a hotter spark. Distributor ignitions have a lot more things to potentially go wrong. To use part of your line, "what it came with" is a far better mousetrap than what came before. There is a good reason it comes that way now! But then, you're using a carb too....

Buryingthesun

DavidBoren

Been away for a while, and this is just too good to not reply to.

Great encyclopedia of builds and results here. I love it.

The AFR205 results are what I find most impressive. You just cannot satisfy these little bastards, it's truly awesome. Tony's MMS205's are on point up to 408ci!

I am loving all the cathedral port heads being used. However, I find myself impressed by the L92 heads, they finally seem to have a place... on 400+ cubes.

I find it sadly impressive that there are no 4.125x3.825 408's in here. Everything is absolutely generic 4" crank builds... which is probably better for the overall numbers in this thread, but displays a terrible lack of imagination, throughout.

I saw the stock 241's and LS6 intake numbers, but does anyone have AI 219 HCR's on a 402", by any chance?

bortous

There were only 3 dyno sheets in this whole thread I was impressed with that had fat torque curves.
The rest were meh.

Tuskyz28

What 3 impressed you?

64post

iTrader: (5)

I think a lot of these 408s but not all are off the mark because they run such small intakes. That and small TBs. Never did a 408 but did a 383 and surpassed many of these motors on this thread using an Edelbrock Pro Flo ram with ported entrance to accept 105mm Holley TB, Hand ported Dart 225s cut to 58cc with 243-251 .624 112 cam, 11.4:1 with 10cc dished piston and 1-7/8 LTs with x pipe through DMax bullets ... 534/475 518 SAE corrected on a Super Flow Dyno.

AINT SKEERED

iTrader: (2)

Hmmm you should add yours too

SAPPER

iTrader: (10)

OK, to revive this a little, Seeing that these numbers are on a Superflow dyno, I'm gonna say this was an engine dyno. The numbers I'm reading for many of these builds are at the wheels. Which tells me the we're making alot more hp at the wheels than his 383 at the crank.
So watch the tails fade off in the distance.

64post

iTrader: (5)

rear wheel,Buddy, through a T56 and 8.8 534rear wheel hp.

neblackshirts

How do the Super Flows compare to Mustang and Dyno Jet #s wise? I have the same cam 243/251 .624 111 and did 463/444 on a stingy Mustang Dyno. That's AFR 230cc, FAST 102, and 3600 stall. Those are good numbers on your setup, I have always felt like I've had underlining issues that I could never iron out.

64post

iTrader: (5)

I used a Edelbrock pro flow intake with a ported TB opening, 42 lb LS3 injectors, a 105mm Holley TB, the Dart heads has extensive port work but probably not as good as AFR 230s, if I could post the vid I would but haven’t taken the time to learn that. Tuned by one of the best out here.

Jkucz86

My 408 just made 407whp/425 wtq
15cc dish pistons
A4 -3k yank with 3.73s
Milled 799 heads to 56cc
tsunami v2 cam
ls6 intake
stock tb, stock.maf
1 7/8 lt headers and ORY.
42lb injectors / 255 racetronix with hotwire.

Not sure why my numbers are so low.

Z28SteveA4

iTrader: (16)

Yeah man those are stock ls6 heads with a cam ls1 numbers. Maybe something with the tune? I would think minimum 450

G Atsma

What is the exhaust after the Y? Air intake? Possible restriction?

Jkucz86

magnaflow catback. Its possible restriction. One of the rear tips have about much more flow than the other tip.

Bob570

That's just how they are. The driver side is on the outside radius of the Y inside the muffler, so more of the exhaust gasses go through that side.

The Magnaflow flows very well, but it's still a 3" exhaust, which will be a restriction on your engine.

Also your heads, intake, throttle body, and MAF are holding you back

Jkucz86

I have seen multiple 408 builds using stock maf to ls6 intake making around 500 whp. They mightve been 6spd cars so i can account for a bit more loss.

Mazzenger

iTrader: (5)

What is the compression ratio of that setup.
Something is off. It's not the most optimized set-up, but it should make a little more than that.