67ss C-10

iTrader: (6)

September

67ss C-10

iTrader: (6)

Or you can just go buy a 4.8 shortblock from a junkyard for $200 bucks and throw it back together! Saves the cost of building a $15,000 motor. So go bitch and whine somewhere else.

defrag010

It's easy to throw around numbers and make it sound like it's going to cost a bunch, but man, your prices are all over the place. 1000 bucks for pipes? There are like 3 bends, and it uses the stock truck manifolds!

1320

iTrader: (6)

The 1205 for gaskets was 120$....they used felpros I think,

I thought I read that they used truck headers JBAs actually(400-535 depending on model I think)....but even so.....I was talking about all the pipes.....including the exhuast which would be pretty cheap really. You need two exhuasts off the turbos, waistgates....(even ebay is another 200 for those) plus the dump pipes, the exhuast out which any cheap exhuast shop would be 350-550 for the turbos back, plus the three cold pipes, plus the air filters which might require pipes.....plus all the clamps and boots...which is an easy $100....
and the waist gates and bov were turbo smart.....probably 700 on them alone.

You think you can do the cold pipes, and exhuast for 500....the v bands and clamps are about 35 each, the t 4 flanges 15 each....that leaves 400.......

If anything my numbers were LOW.......and you have an engine that when it goes will cause the user to change stuff....which costs more. BTW who does quick port jobs to 300 cfm? Seriously, wcch and most others are 1500-1800 for a 300 cfm head. 275-285 out of 1250$ patriots? But they do a quick port and get 300? Typical HotRod......

got-a-ls1

iTrader: (12)

Numbers do seem high on the n/a horsepower and flow numbers, but hey whatver...

Also they used no name shorty headers i believe... so what point are you trying to get across here? Turbo kits cost money? or the 4.8 motor is a waste of money? i dont see where your coming from. Only a fool would spend all that money on a turbo kit that wasnt built for what they had ultimately planned for.

The Alchemist

iTrader: (19)

My point is that there are a lot of guys who add forced induction to their stock shortblocks and stay at a modest boost level (less that 8 or 10psi) because they don't want to drop their motor and go forged, or they don't have the money to.

So if you already have a turbo or supercharger as well as the other supporting mods to go from 8psi to 16psi, but can't because of fear of cracking a ring land, then this is something to consider.

Right now, that's the situation I'm in. I will have the fuel system in place to make upwards of 700+ horsepower, but I'm on a stock shortblock so I know I need to keep the boost and tune ultra conservative and stay below 600rwhp. I plan to use water/methanol injection to help keep the pistons cooler, but if I could regap the rings and get a safety margin to 650'ish horsepower, then why not.

98Camarod

iTrader: (43)

I think his point is to say that taking this 4.8 to such a high level is not smart. He's saying have a purpose built motor, not something that can/will leave you stranded.

396375

iTrader: (10)

I'm thinking there is more drama in telling you it is a 5.3 and then in the end realizing it was a 4.8.Obviously they could have changed the number before print.

JAX04

iTrader: (17)

I agree, i was making an observation, not asking a real question. lol.

1320

iTrader: (6)

Here is a good 4.8 experience....
https://ls1tech.com/forums/forced-in...i-cheaped.html

I remember once I was present for a shootout.....for a magazine. Not one car even ran a 12......but in print one made the 11's, and more then a few made it into the 12's.....of course everything you read is true.

All 4.8's with a mild port job a 228/230 cam and headers make 451 at the crank too......the guy in the above link had a hard time making that number with a procharger. Lets see.......a procharger makes 355/341rw on a 4.8....(costs around 7000 new?) and two ebay turbos makes 1200 at a cost of 1000$........hmmm, I hear theres a business for sale that use to sell superchargers, called pro something or another.

yea thats the whole story.


I also find it incredible that I can find the 4.8/5.3 crank casting number, piston differences, ink used differences, rod differennces in about 4 seconds, on this very site. But they didn t know? Or check...? pull the head off and see a flat top piston.....ohhh "whats a 4.8 Alex for 500?"

bozzhawg

Well unfortunatley it can happen, I know someone who bought a 5.3 and it was sold to him as a 5.3 but when he had to open it up and read the numbers on the crank it was a 4.8.... Now this was stock... and this does happen...... very often.... so it was not just a single case that was used to make the article more sexy...... It can happen..... They share the same block for the iron 4.8 and 5.3....... Matter a fact I know a member here that the same thing happened to but he just made do and ran 116mph in the 1/8th 3200lb car......




Bozz

1320

iTrader: (6)

Sure it can happen when you buy it. But these guys pulled the heads, pulled the rod/piston to regap the rings. Infact, in the second paragraph they say"flattop pistons" . Rt there.........they new. I know, I know, no one buying one would research how to tell them apart since they say rt on them 4.8/5.3.....no body would do that.

Its about 99.9 % that the 5.3 part of the story is just that .....a story, which means any part of the rest could be.

07MCSS

iTrader: (3)

I'd like to see someone duplicate their build and report the results. If someone else here can see over 1000hp on a similarly built(stock) 4.8, I'm a believer!

bozzhawg

@1320 I am not going at you, just throwing some different perspectives out there........

But, I find it interesting, that when certain brands X, brand Y, Brand Z, do certain dyno test here on LS1 or articles, to promote their products, some believe the test as to be "gold" or truth without any manipulation of variables to favor the sucess of their said products. And most here do not challenge them, they just accpet it as status quoa and be sheep without questioning the ultimate interest or goal of the brand posting the dyno or results of a said product. ...Why? Because most have been preconditioned to believe that it is the expectation of the said product to perform a certain way and the major responsibility as a marketer or advertiser is to make whoever they are marketing /advertising to, feel insecure and incomplete with what they have and connect to your emotions with your pocketbook.

So this creates the emotion that if I do not have brand X,Y,or Z then you are incomplete and it is also marketed to you so that you believe that if you want major power than you must buy brand X,Y,Z.

This article was not to sell 4.8's,5.3's, or any cam or head etc.... Maybe a little promotion for TEA but hay.... The purpose was to show the posibilities.....

But it is just amazing how people pick and chose through their preconditioning of what test (dynos or articles, magazines or forums) they will decide are valid or invalid.

Bozz

redhotev1

iTrader: (5)

AMEN TO THAT BOZZHAWG!!!

If you're not following the "ls1tech" trend, than put on your flame suit, cause that's just the way it is!

That's why i turn wrenches, not read about them.

IT_SS

iTrader: (5)

which would explain the A2W and 118oct

1320

iTrader: (6)

Bozz, the funny part is that I love the article. Im a huge supporter of doing it cheap too. Although my injectors for my van just cost me 950$ cough....arg..

I think its probably note worthy that the 7 layer felpro head gaskets held up. I m curious of the gasket bore they used.

Id also like to see the tune.....the timing table really. On turbo buicks, with race gas at 26-30 psi they often get 24-26 degrees. Im just guessing but Id bet they were around 20?

I think its interesting that its so easy to believe things in a world thats obviously so filled with half truths too

Sierra1320

iTrader: (1)

Very Impressive! I bet the engineers at GM are feeling a little cocky right now. lol

I would like to see how it would handle a pass down the strip. On 118 octane and 26.8 psi is amazing. Shows just how flexible and efficient the LS platform truly is. How linear they boosted it and with the short stroke of the 4.8 probably helped it survive along with the other modifications listed. Awesome...

70lsgto

iTrader: (2)

I pulled a 454 out of my 55 chevy and put a 5.3 in and love it, that hot rod story was a great story even if they said it was a 4.8 at the end..they probably knew when they took it apart but saved it till the end of the story for a punch line.......why would hot rod care if people buy old truck motors from the junk yard anyway.......save your money dont buy forged internals just stock pile spare ls motors...yeaaaaa

bettonracing

iTrader: (3)

Was a dyno chart/ spreadsheet posted in the article? I'm curious to see what the curve looks like with "76mm" twins.

Regards,

Kurt