Smokey B

You guy's over complicate **** CID ....B!

Luv..less rpm 4 hp = stroke...go with i wanna b different...get F'ed...388 runs 10.1's 418 runs 9.8's tfs heads same style car....pump gas & hyd roller...


Yeah your rpm just got F'ed with Luv...

Hi...real HNIC in the building...sorry to call BS. We talking street...no SR involved.
99 i'm off your thread..best of.....u no...

bortous

Smokey, you been smoking again.
Rambling on......
You were making good points yesterday.

99 Black Bird T/A

iTrader: (4)

Don't post that offensive term or any similar racist stuff in my thread. That's not cool at all. It's 2019 not 1819. It's certainly against forum policy. I'm not politically correct, lean hard right but have zero tolerance for stuff that's offensive or potentially offensive to my many good friends of color.

You're welcome to post car and engine related comments.

bortous

I don't think it's offensive.
It is just stoned rambling to me.
It's a shame as Smokey was making good points in other threads yesterday.

99 Black Bird T/A

iTrader: (4)

The rambling is what it is rambling. Yes Smokey was on point yesterday with a lot of excellence comments. He's a big plus to the forum when he's on topic and posting clearly. I like reading what Smokey has to say when he's on like yesterday.


The term that I put in bold, it's absolutely offensive. Can't let that slide, have to say that's not cool, don't post that sort of stuff. To say nothing is to condon the use of the phrase,

Head N-word In Charge - radioactive offensive in my opinion. It's a word with a horrible history and context in America. I don't know about else where in the world.

bortous

It is but I don't think Smokey was actually being racist.
He was referring to himself as a HNIC.
Nothing has changed with racism.
It's still rampant everywhere.

99 Black Bird T/A

iTrader: (4)

I doubt Smokey had any intention other than saying "I'm the boss, expert, authority on heads & CSA" that's 75 percent of his posts lately.

Using of the term is the issue. It has no place being used regardless of who he was referring too. The term is offensive.

bortous

Maybe to you it is offensive but not to me.
As long as he was not actually being racist and saying derogatory things then yes I would draw the line.
I don't like racism either.
Smokey if you are reading this, process this information properly.

Tuskyz28

Lets get back on track..if you go with a 427ci dont use TFS 255 LS3 heads. I been viewing a thread and i wasnt impressed with them at all. They only made 64Xhp on a 12.1 compression ratio 427ci motor. Be better off going straight to a LS7 head or a aftermarket cathedral.

99 Black Bird T/A

iTrader: (4)

Wow I bet someone wasn't happy with that. Were the heads straight out of the box as cast? I've heard before the TFS 255 LS3 was underwhelming but that's looking like proof. If that's what they did on a 427, probably not very desirable on a 376, 388, 400 or 402.


While kicking this all build around, .020 over is the stated max for a LS2 but is there really much risk going .030 over? Or maybe a better way to say it is how often are the liners straight enough without shift to go 4.030? Will sonic check show for sure?

My block has to go .010 over to clean up if doing the stroker. I've read of a few rare LS2's going to 4.065 even.

What's y'alls experience and impression?

bortous

Most LS2 blocks can be over bored . 4,030 no issues.
It's a common thing to do.
You can bore them more but then you risk strength and that's something I would do.
.030 is the max safe overbore.
Those TFS heads seem make less power than GM LS3 heads.
I won't touch any aftermarket LS3 head.
I would either use an LS7 or a high end cathedral

bortous

Correction:
Something I WOULDN'T do.

Bspeck82

Hone to bare minimum. If it's 4.010 then that's all I would do, leaving you room for 1 clean up good forbid something breaks. You won't leave much on the table and without a 4.065 bore the ls3 heads aren't optimal anyways. Too much valve shrouding, a good set of cathedrals will do better for a street car.

If you can get a block that will properly support the ls3 platform I'd do that. The ls3 and ls7 heads are very efficient in terms of port design and the short side walks all over the cathedrals.

bortous

I went overbore specifically for the shrouding.
Plus fitting a set of higher ratio rockers helps too.
This shrouding is very exaggerated.
You would be hard pressed to tell the difference.
I am using a new block for my next build.
I will either use an ls9 or dart aluminium block.

DualQuadDave

iTrader: (6)

A lot of talk about you have to rev a big bore motor vs a stroker motor to make the power. That's not totally true. Bigger CID is bigger CID, it will make more torque and power across the range, all else being equal. Sure, the stroker crank gives you a few more cubes, but I guarantee the big bore has substantially higher hp per cube and more ultimate potential. Again, it sure is nice to have all the cylinder head options in the world vs trying to figure out what works on a 4.00 bore, which basically comes down to a cathedral or small bore LS7 if you want to rev it. More to think about, everytime GM wanted to make more power w/ a LS they just kept making the bore bigger w/ same stroke until they went all the way w/ the LS7. The more you read, I really think Jake knows his $hit. Maybe techws6 will chime in, as well.

bortous

You do have a point but these LS3 heads already work so well on 408 stroker.
Being on a larger bore might make a few more ponies vs a 4.030 but the difference isn't huge.
However i will ask my builder this question tomorrow.
He will be able to give me facts.

DualQuadDave

iTrader: (6)

The only way to know for sure is to test back to back, but I will throw my opinion up and say the LS3 head will run way better on 4.125 bore vs even the stock 4.065. I think that's been proven at least once, I would think. At this point it's a valve shrouding issue waiting to be solved. Will the LS3 heads run better on any bore w/ a stroker crank, of course. It's a huge head, adding CID will make it work better., but still not optimize it. Besides, the topic is which will work better for $$$, crank or bore. I think the answer is hands down bore, just for the options it opens and the strength it gives the block.

bortous

I already know the bigger the bore the better, but the differences I feel are exaggerated.If you had the exact same combo on a 4.030 bore and then you did the exact same thing on a 4.065 bore, I call not much difference. I feel the 4.065 bore will make more more power mainly because of more cubes.
I have no data myself but by engine builder has been building LS's since the late 1990's when they were first released.
He has done hundreds of these over the years and is the primary engine he builds.
I will find out and post his response here.

G Atsma

The difference in area between 4.065 and 4.030 is less than 1%.

Tuskyz28

Difference between a 408 and a 416 is roughly be 10-15 horsepower estimate.