Smokey B

What ever I need to do to make hp. Not some BS sales. No head is perfect unless we start with a clean sheet and know the CI and rpm range.

Smokey B

Darth ....we just use a smaller cam and + lift to utilize the larger port and smaller rpm. Guys say TQ yet most don't know what happens when you get it. If a cars heavy cool if not... You know the drill. It won't Hook. It never will unless a gear change or larger tire. How large do you think Cdubbz 800hp 434 cam is...or look at Johns build with a 302cc port 427 ls7 +3.1 mcsa. If I'm moving 420 cfm with good port speed the smaller runner will lose in a race. Y? Volume of air and fuel with good port speed fills the bore more and just as fast. If a small port was - is so great why is there non breaking records. We can trick a port. But filling the cylinder tells all. And most higher number builds use + compression to influence people.

Smokey B

To G...your PM's are blocked. Y? You don't want no smoke in real life. So PM's are a waste of time.

Smokey B

Match the CSA to your build and rpm with porter chosen and thats it. Don't hinder fuel and air with a BS intake. End!

Smokey B

I say give me the Samtech emc ls7 3.2 csa heads you take the small ports and let's see how things play out on a dyno or for a et. And not some BS msd intake or fast BS.

Engines r so simple if you think about it. Just like a runner running. Fill lungs with air..
.. Try running with a bottle neck or small lungs and or throat and say you broke a record. Same with a engine trying to fill the bore with air and fuel. Surgical tech school carry's over. 3.9 GPA.lol

G Atsma

Can't take the heat, huh?
Check your PM's...

Smokey B

Some think I come here to hate.


Not or never the case
I want all to know what took me yrs to learn and money not needed to spend.

2 pair of heads 1 engine all @ the same damn time. Could have been Done! But I luv cylinder heads so F it. Also don't get caught up on hype or advertisements. Always look at who's winning with proven results. Dyno lie all the time. Tuskey I see what your saying. ET and mph don't lie. You say a 418 is running 9' on pump gas and a hyd roller, in a 3200 lbs car and tfs 245's. You honestly can make hp with any heads if you've got the correct porter. You guys know of the factory cathedral heads and 600rwhp 41x ci? Greg Good pump gas special with a fast intake. Old threads....

Tuskyz28

Im go say 605 horsepower.... give a lttle, take a little. Thats a tough question to answer and ill tell you why. The more stall you got the less power will be put to the ground, you never mentioned your rearend... it makes a difference as well. Then all dynos are not the same. Ive seen the same car on a different dyno put down 50 horses over the other dyno. Just too many factors to give you a accurate answer. Its a guesstimate game.

bortous

My tuner says with my rear end and trans there is a 30% loss so that puts me at about 640hp at the crank. Manuals lose about 15%.
My tuners dyno reads about 15hp lower than most others.
I have been to two other shops and they all showed more power.
I always believe the one that produces the lowest power,
Who knows

Tuskyz28

Jake~"And that's between a 402/408, 416, 427. The difference in cams, heads, and CID isn't much. But you're looking at a good 100HP more out of the 427 vs a 408 with the same topend. Just from unshrouding the valve."

Pat G been preaching that for years and years but you know.... it goes in one ear and out the other to MOST people. Its a OLD THREAD where Pat G removes his L92 heads off his 6.0 G8 and he installed some AFR 230 cathedrals and the car made over 500 rwhp. He was hung around 460 or so with the L92 heads on the same dyno. In THAT thread he SPEAKS on unshrounding the valve. He basically said if a valve is up against the cylinder wall it hurts power/performance. Well Jake you basically just said the same thing.

bortous

A long time ago I made 470rwhp on my 6.0 with CNC LS3 heads with a lingenfelter 229/242 114 LSA cam. This was also through and automatic and a stall. This was the time when the stall converter was too loose and the car drove terrible. I also had insufficient springs and pressures and maybe even pushrods because power died at 5500rpm. If I had a proper valvetrain setup I probably would have made more. This cam should have kept pulling all the way to 6800rpm.
This was a Long time ago when I was using someone else who was ripping me off.
Is it also true that you can help the valve shrouding if you install a set of higher ratio rockers with higher lift?

Darth_V8r

iTrader: (4)

Tusky I like your posts a lot. You force me to think differently.

KCS

iTrader: (20)

Disharge Coeffiecient, how do you use that to pick cylinder heads?

JakeFusion

iTrader: (7)

Well, a 2.200" valve on a 4" head would perform worse than a head with 2.12" valve if everything else is the same behind the valve. And the only difference is the valve itself and valve job. Unless you were running .800" lift and enough RPM to make up for the lazy Coefficient of Discharge (CoD).

Btw, the SPS Haymakers come with a 2.120" valve in the standard LS3 configuration. Since I was going to a 4.125"+ bore and solid roller, we went to a 2.165" valve... and the cfm rating @ 700 went from 375 to 400 with the same runner/CSA. The difference is the midlift would normally suffer going to the bigger valve since it's in the way of airflow at .200-.500 lift... until you unshroud it. Then the larger bore/valve flows better everywhere and becomes more efficient.

Darth_V8r

iTrader: (4)

What if you use offset pins to shift the heats 030 and unshroud the valve?

JakeFusion

iTrader: (7)

That could probably work. The LS3 head is too close to the wall otherwise really for anything less than 4.065" bore... why a 376 LS3 walks a 408 LS3 in terms of power and torque.

bortous

I don't think an ls3 would make more torque than an LS 408 even on a 4.030 bore.
Obviously a 416 or 427 LS3 would for sure.

Smokey B

Jake the guy with the 408 must have a trash builder or put together trash...In the REAL WORLD if set up properly a 376 has no chance in hell with just a + .035 over bore. .065 vs .030. Again the stuff people do to sell ----. the 376 needs rpm ......8800 vs 7900 to make the same 790 ish hp.

Smokey B

I have Ls7 heads for a .030 bore so if I went to a 2.125 valve VS what I have now 2.20/1.55 it would pick up perhaps but Nothing to call home about...

https://www.yellowbullet.com/forum/s....php?t=2577731

Smokey B

and that Mid flow Jake may work with your heads and bore size.....(figure of speech)> My heads $h!+ on anything made for a smaller bore from .100 to .800 and .060 and under bore size. 2.20 valve VS any valve size used 2.125-2.180 with any aftermarket heads. Also have a larger runner 275cc so I have better cfm and what about the floor speed. Just as much as the smaller runner and valve combination. How's this.....the cfm @ lower and mid lift numbers, generally suffer when the port is to big. Hmmm. BTW my guys flow bench is tight as hell. WCCH's 400+ cfm Ls7 heads tested like 10-15 cfm off whats advertised.