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TrailblazerSS
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121 Posts
Discussion Starter #1 (Edited)
Well it is time to rebuild my eng in my stock 2006SS.
I bought it new in 05 was one of the first to hit local dealer.
I tow with this truck and don't want a race truck.
But figure as I got it out want to do what I can.
Not looking to throw money at it gust for the sake of LOOK WHAT I GOT.
has 179000 on the OD. got a rod knock because I'm a dumb ass and did not check the oil this last year.........LOL
Got lazy and did not take it to jiffy lube..........LOL
Stop driving it every day last year. Got a new Fiat 500 for the wife to drive.
The $80 a week gas bill was just a waste of $$$. $20 is much nicer.......
So lets talk rebuild......................
Pistons? don't want forged........... So what is out there..............
Do thy have to have the valve reliefs in them????????
How much can you boar out the block with the stock thin sleeves in it.
Rocker arms? Are their stock rockers with more than 1.7 ratio?
Want to get more lift and at .050 duration with the stock cam.
Valves? How big of a valve can you cut the stock seats for on the 243? heads?
If thy can be cut bigger what int and ex sizes will give the best flow balance?
Also any port work tips would be nice. Yes I have ported a few heads in my day.
I will start here and see how it goes before I ask to much.
I see there are some pretty smart people on here.
So help the old geezer out if you can.
I have not had a copy of Hot rod next to the toilet for some time now...LOL
 

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Premium Member
TrailblazerSS
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1,679 Posts
You can get stock style cast replacement pistons on ebay, they will be flat tops just like stock. since you arent going with forged pistons I would stay with stock or close to stock bore. You can add 1.8 ratio rockers since you dont want to change the cam. I would stick with stock valves. Maybe mill the heads down to gain some compression. As far as head porting goes I wouldnt recommend it unless you have a way of messuring the port cc's so they end up equal.
 

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121 Posts
Discussion Starter #3
So flat top will work with the 1.8 rockers and a stock cam.
CC ing the ports is no problem. done it before. Not looking to hog them out. Just a bowl clean / blend and port match.
Are the dart valves any good say the 2.02 int - 1.60 ex
Seams there are some cheep ss1.8 adjustable pedestal rockers on E bay any good?
How about the GM beehive springs any good for this kind of build?
 

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TrailblazerSS
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121 Posts
Discussion Starter #4
on the rocker arms what GM 1.8 rocker part # will work on the 243 heads?
I see the one rocker on the LS7 has a off set. Will the one with out the off set work?
If so what is the GM part #
 

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trailer park living.
TrailblazerSS
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16,328 Posts
It won't. The geometry is wrong for it. If someone wanted to spend some time playing with the rocker stand height it may be possible

Sent from my SCH-I435 using Tapatalk
 

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Discussion Starter #6 (Edited)
That was my next question.
push rod length and rocker stand adjustments for geometry change.
Shorter push rods and cut the rocker stands some.
I see there are pedestal kits that look like thy could be cut down easy enough in the lath.
lot of push rod options out there.
Have a mill and a lathe to work with at home.
Has any one done this swap and would like to share what thy did?
In the old days when I built my Pontiac engs it was easy with the studs , Polly locks and the 3 piece take a part and cut down Mr Gasket push rods. Had to grind on the Crain 1.65 roller rocker some to clear the spring retainers.
But this was a feeeeeew years ago when I was on top of it.
I was looking at this also.
http://www.ebay.com/itm/Chevy-LS1-LS6-1-8-Ratio-Adjustable-Stainless-Steel-Roller-Rocker-Arm-Set-/171429026385?hash=item27e9f75a51&vxp=mtr
http://www.ebay.com/itm/Chevy-LS-1-9-Ratio-Adjustable-Stainless-Steel-Roller-Rocker-Arm-Set-/181783609934?hash=item2a5325c24e&vxp=mtr
http://performance.gmpartsnow.com/p/12621428-Valve-Springs/315/105
http://performance.gmpartsnow.com/p/12625033-Chevrolet-Performance-Valve-Springs-Beehive/1113/105
the 1.9 rocker arms the 12621428 spring.
Being adjustable rockers and the pedestals to cut or shim as needed I should be able to get it right.
Was thinking 110# on the seat. Should have room in the spring to shim them to get the seat pressure up a little. Then it should give me a 300# or so open pressure. Have to do the math to see.
Made my own spring pressure tester many years ago. Will have to dig it out of the tool box....LOL
.580 lift with the stock cam..........
$200 for it all............
 

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Premium Member
07 TrailblazerSS
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1,554 Posts
IMO I would not do aftermarket rockers. If anything, make the stock ones better with a COMP trunion kit. If you want to add more power, do so with bolt ons or a small cam, doesn't have to be anything radical.
 

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Discussion Starter #8 (Edited)
The stock rocker lasted 180000 miles and don't show any wear.
So why would you need a kit to make them better?
Changing the rockers ratio will change the cam.
The rocker kit is as much as the new rocker arms......................8 Chevrolet Performance LS Rocker Arms Small Block GM 12579617 | eBay
Just trying to wrap my head around what you are saying.
The eng is out and apart........now is the time............
http://www.ebay.com/itm/12625033-GM-Performance-Valve-Springs-LS1-LS2-LS3-SET-OF-16-/301642116227?hash=item463b456c83&vxp=mtr
http://www.ebay.com/itm/12499224-SPRING-PKG-General-Motors-/121674611012?hash=item1c545f3944&vxp=mtr
http://www.ebay.com/itm/Chevrolet-GM-OEM-06-13-Corvette-Valve-Springs-12621428-/111591540010?hash=item19fb5fc52a&vxp=mtr
 

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Discussion Starter #10 (Edited)
Wrong as in what way?
More at .050 timing.
Keeping the valve opening and closing points.
Keeping the LSA?
More lift?
Not spending $$$ on a new cam?
Still have to buy spring. Not using the old fatigued ones over.
So $125 on the after market rockers or $150 on the stock LS7.
1.8 will give .550 lift with the stock cam
Either way I will have to mess with the geometry.
So how do thy make the geometry work on the stock LS7 ?
Different valve height/installed height?
Different push rods?
Different rocker stands?
Have to do some more home work to see......................
Don't be SKEERD of it...........It's just a valve train.......LOL
 

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TT AWD TBSS Jeep
TT AWD SS Pwrd Jeep
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5,825 Posts
Dont totally rule out forged pistons. Eagle sells a nice rod, piston, crank combo that will save you a bunch in machining costs of turning the crank, might be very close to what your considering doing. Check it out. Also ask the machine shop about them purchasing the kit, on my build they got a better price than ebay due to volume and dealer pricing.

An LS9 cam though not meant for NA will pick up some nice power and not kill mileage. Helps allot in the upper rpms. On a 5.3 it picked up 122hp at 6200rpm iirc. Wont be anywhere near that on the LS2, but 25-35hp sounds about right, and no need for higher ratio rockers. Plus its only $125 - cant beat that!! G/L
 

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Discussion Starter #13
with forged pistons my just need to be honed to fit no over boar needed.
That will save a few bucks .......
 

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Just a noob
TrailblazerSS
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6,206 Posts
can you run flat top pistons with the LS9 cam?
What the hell man? You need to make a combo that works. Throwing a ls9 cam isn't what u would want. Put a small cam like a rob cam from pcm for less then do the trunion upgrade new springs, a fwi and a good tune. If u have the money then a converter like a 3000 so u can still tow.

But to me it sounds like u need to ask your chosen engine builder for advice, not to be rude but it sounds like u don't know much about these engines to build one on your own. Just slapping random parts together will hurt you not help.

I'd rather see u address the oil issue and a rebuilt trans and coverter. Then do some bolt ons
 

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Discussion Starter #16 (Edited)
The trans is going to be rebuilt.
Pulling the eng and trans together.
That cam is $389.
looks really nice just not in the budget.
Now if you got a extra $1000 you can send my way I will get right on it........LOL
That LS9 cam is cheep. But I don't think it will work for what I want to do.
Remember this ain't going to be a 1/4 mile race truck. It has to tow a boat also.
I will get a LS7 rocker to see what is what.
I think I can handle making the geometry work. Done it many times before.
This ain't my first time a the rodeo.........LOL
Bin a mechanic for over 35 years and still turning a wrench every day........
 

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Just a noob
TrailblazerSS
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6,206 Posts
Your a mechanic that takes his truck to jiffy lube and didn't check his oil and blew up his engine, asks advice and takes none of it from some people like kelly.

I wish u the best of luck because u will need it!
 

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TT AWD TBSS Jeep
TT AWD SS Pwrd Jeep
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5,825 Posts
I put an LS9 in the 5.3 and it drove like stock, idle to.

It would be a cheap upgrade over stock, hes trying tosave $
 
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