A.R. Shale Targa

iTrader: (2)

Engine Dynamics and Principals of Horsepower by LJ for a hundred....

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That guy said it would make hp and 5's in the 8th believe Flyin did that with a 402 E85 hyd roller & FRH stg1 heads add in Sick with 540 rwhp 6.2 Ls3. Dude did say before hand that there good with verified numbers. What's not to like about that? With Factory parts. I do love cylinder heads so here's a current find and read LJ sent me. LOL!

Victor LS-R CNC Cylinder Heads For LSX Engine Blocks

http://www.edelbrock.com/automotive/...ctor-lsr.shtml

big hammer

Stock ls3 castings have wicked potential. Can be made to flow unlike most heads out there

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Hammer I did the same thing with Ls7 heads just a cheaper casting and was told that going from a factory Ls3 to a factory style Ls7 head was worth around 20hp at minimum so I just found the cheapest and best way for me to do it. You ought to see the cam quoted. 277 on the intake side with 780 ish lift.

Here goes G.Good version of CID heads.

Patron

Darn it. It won't paste. But 290 cc flows 412 / 274 @ .700 its on Facebook from CID. Greg posted this on CID 9/7/2017. I didn't know Mr. R. Coleman sent me the update. Just checked my FB messages.

Darth_V8r

iTrader: (4)

Damn, thats some hella flow

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Yea Greg listed everything on the post from .100 to 1000 lift. Good dudes I must say they've always answered or lead me in the right direction. Just left the barbers chair going out for lunch. Gotta get ready for the Fight.

DK

Anyone know the cam specs?

Patron

They didn't list the spec's but....... being destroked the cam duration @ .050 shouldn't be that much. Around 240 ish. Each engine requires a certain duration for a given crank size + or -.

DK

Im curious about the lsa, if they went with a wide cam or not.

big hammer

Like wide split?

G Atsma

I THINK he means a wide LSA #

Patron

It all depends on the owner or builder. Being that you could very well have a cam with more duration and have a tighter LSA to bring in the TQ or HP earlier. Or a cam with less duration yet wider LSA for more top end. Example: a Long duration cam 250/254 with a LSA of 108 Vs a 242/246 cam with a LSA of 116. One peaks earlier while the other peaks in the upper RPM range. All depends on what the owner is looking for.

spanks13

iTrader: (5)

From watching a couple YouTube videos it seems like the thing sucks at idle and part throttle.

I don’t know if it is cam or tune related or both.

ColeGTO

iTrader: (3)

The LSA is not what makes more or less power. It's the cam events themselves (ie: IVO, EVC, EVO, IVC) that make the power. The LSA is to a certain extent the BYPRODUCT of the desired cam events. From my experience, a good cam designer picks certain events to target for a given combination and RPM range.

Given that, two cams with the EXACT same amount of duration on intake and exhaust but having a different LSA will make for the most part, the SAME horsepower at peak (relatively close within a few percent). The difference is that the cam with the wider LSA will usually "hold on" a little longer after the peak and not fall off so quickly. This assumes that you are installing the cam on the same ICL. This in turn will usually have better average numbers as well. I believe this has more to with EVC, but I could be wrong.

Here's some VERY good info on how to determine the best cam for a given combination as provided by a VERY smart man, George Bryce:

My 1st choice is to determine RPM range we are going to use.
Then the very close next factor is the lift. All of our heads and valve trains have a lift limit.
If it is one intake valve per cylinder and if it is an all out N/A engine design, it will need as much lift as you can run.
In my opinion we always make more power with more lift....we all started with .850 lift years ago.
Now we run over 1.200 lift in big motors.
Then how short can we run the duration?
You can only go so far so quick. And get back to seat on time.
Then we need to close the intake at the right time.
Open the exhaust at the right time.
Open intake next and close exhaust last.
Once these items are done....the most power will be had.
The rest of all the work left to figure will net less gains.
Just my opinion.....Like I said.

Then this question was asked:

I agree, but WHY is the lift helping so much ?

George's response:

On our engines, the more we lift, the more the valve gets "out of the way"
If you flow a record holder head, it probably flows a good bit more with out the valve in the head. (we turn it up side down in the guide to let the stem be there).
If it does, how can we run without a valve?
By moving down and away from head(more lift)
Next and biggest reason is, we want to go through .900, 1.00 lift, on the way up and on the way down...not just max flow at one degree of rotation.
To me, that would be like waiting till peak power and then shift, or gear it to see peak power only at the finish line. Area under the curve.......Lots of lift give you a big area under the curve.
If your head stops flowing at .800 lift....why not run it to 1.00 and let it be near, going to, staying at, and flow lots longer? Anyway, just food for thought...right?

If you want to learn more, the N/A forum on YB is a great place. Lots of smart people. Another good place is on SpeedTalk.



Cole

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More than likely the LSA is tighter or narrower to bring in the TQ earlier as it does rev pretty high. Tighter Lsa generally sound more retarded or has a bad idle the shorter it gets.

As I said the LSA does just what you said or I said @ 1st. Shorter LSA brings in the PEAK Hp earlier while a wider LSA makes the HP further in the RPM range or hold hp longer same thing.
If you use the same Cam with one being 118 and the other 106 the shorter LSA will fall off while the other holds power better yet won't make as much bottom end in the lower RPM range Vs the shorter LSA.

YB is a good place and a few good guys....but there are a lot off haters & Racist over there. FACT!Go over there and look around. Also talk down about the guys's here. Speed Talk is a nice forum also. George Bryce is a good guy even gave me the idea of using Pro Comp Ls7 heads that some BS guy's over on YB said can't fit a 4.030 thru 4.080 bore. Little welding required for under 4.060.

Same G. Bryce. To bad he went out of business.

https://ls1tech.com/forums/generatio...ls7-heads.html

http://www.yellowbullet.com/forum/sh...d.php?t=321654

ColeGTO

iTrader: (3)

Sorry, I misunderstood what you were saying. My bad. Didn't mean to step on any toes.

I'm build what is probably a similar engine as we speak. LS3 at 4.070" bore, LSX-LS7 heads that I turned the stock Sodium Filled Exhaust Valves down from 1.610" to 1.588"-1.590", milled heads to 64cc for 10.9:1, LS7 stock intake and 90mm TB and a LSX-454 cam (236/246 @ .050" with .648"/.648" lift with stock LS7 rockers with a CHE trunion kit.

Should make close to 600HP on the dyno and maybe 525-540HP to the wheels. Going in my 2005 GTO T56 to have some fun on the street. Closest DECENT quarter mile track to me is 2.5 hours away.

Patron

No Homo......LOL! or tripping as long as we are on the same page. I'm just trying to be long suffering as IF..... I had the $. Boy oh Boy. Seen a thread 1000 hp pump gas * street motor with a Ford. Think to myself I've got a 5.3 that wants that no longer what I thought was good. Besides the *street* 408 that's good for 700 to 800 + depending on heads used.
Gotta get 1 done at a time. Oh yea I've seen you on YB. I'm Rowdy BTW. The guy who's servers banned yet still There with the same server. Guess they don't know about the dark web LOL! I'm DarkMatter over there now. Google dark matter? Small scientist with a GED. And surgical tech, Apche Tech, stone mason I could go on. Build homes also. Felonies F'ed all that up but oh well gotta keep going! Had those before most listed besides the Army stuff.

Patron

I'm the guy who looks at builds and say to myself ....oh he did it he ain't Shhhhhh.
Respect only goes so far as I remember I or you can do it also. He did it, so *Y can't I and it doesn't have to be the same makeup. I've got the BluePrint. It's only 4 strokes we're dealing with! They're ALL THE SAME no matter Maker. I try not to look @ big names rather Who's who and does what. No over charge here I can make that & Learn something along the way. Not just because So & so say's it works. I've seen guy's here spend 5k on LS7 heads no hating but .......think about it? I did say 800 with a 408 on the street with pump gas. Just need a little more rpm Vs bigger cubes.
5.3 whispered and said I'll be glad when you have time for me I wanna grow to a 460 like you said.

Stay thirsty my friends. Dos Equis makes you the most interesting man in the world. LOL!