69Z28X11

Hey guys, I'm new to the forum(not cars or motors). I am curently building a 69 camaro and plan to put a 5.7 LS1 in. The motor was out of a 98 ss camaro(pull out). Going with a t56 trans, 12 bolt rear(355 posi). That being said, I just pulled the motor down and there is a dent in 6 out of the 8 pistons(looks to have been over-reved). None of the valves are bent and I also have a set of 2001 heads(center bolt valve cover). I am looking at getting a set of L92 heads and get rid of the other two sets. In the break down of the motor, number 6 rod bearing was spun and the crank is basically trashed. Now, what I want to do is build a mild stroker motor with a mild cam. Nothing to agressive because this car will be a mainly street car and every now and then to the track. The motor is now at the machine shop to get cleaned and then I will get the block back till I get all of the parts(thats where I needed the help of the techs on what sizes to go back with). The ECU is out of a 2001 and the throttle body is stock for now till i can afford to get a fast system(this is in the plans in the long run). I want to make between 475-500 HP with no power additives.

I have some pics if needed

ULTIMATEORANGESS

iTrader: (4)

i hope it comes out nice.


ive wanted a first gen SS with an LS motor for awhile now.

1lejohn

iTrader: (9)

The 92 heads won't fit on the 5.7 bore. You need a 6.0 or larger for them to work. The easy way to make the power you want is to find a 6.2 block or engine and build it. The little 346 is going to take good heads like 225's your choice of vender ,a Fast 102 or a used 92 intake and a large cam that revs.

A 402,408, or 416 will make more useable power and have more torque under the curve then the smaller motor. You can use the L92 or LS3 heads an intake and be at 500 rwhp.


good luck with your build.

69Z28X11

Thanks john, but that is one reason I asked(5.7 block) where I needed the numbers to be. I can have the bore enlarged is why I was looking at the l92 heads. That's another reason its going back to the machine shop. What stroke and cam do you recommend? I will be going with eagle from pistons down. Comp cams cam. Just the ports on the l92 heads and intake look to flow much better.

ULTIMATEORANGESS

iTrader: (4)

im a fan of big cubes so go as big as possible.

garygnu

look at a TSP 383 rotating assembly.and check out their 215/227 heads.you should consider a EPS cam and a fast intake .

69Z28X11

The fast intake is in the air and plan going that route as soon as the budget allows. I just found a 6.0 running(still in a car). $1000.00. Would that be a better way to go for what I am looking at doing? Is the price right?

JohnS Z28

iTrader: (1)

how many miles?
also be careful with your wiring harness's and ecu's, 98's are of course different than everything else.

MrDavid

iTrader: (11)

With the power goals you're looking to attain, the 6.0 would definitley be a better choice. It opens your options up to higher flowing heads which is where you will make most of your power on a N/A setup. Since you're building engine and looking at specific goals, you should also look into getting a custom grind cam. PM PredatorZ or PatrickZ and let them know what your goals are and they can spec you out a cam. TSP can cut the cam for you for less than $400 (price last time I checked).

lemons12

iTrader: (71)

Fast intake is a total waste of money with an ls3 setup..1000$ for 5rwhp, no thanks.

For a majority street car, I recommend cathedral heads. Something like some used afr 205s. Because of the valves on those heads, and the lack of displacement with a 347 or 383, it will be kind of lazy under 4000rpms. They just cant provide the velocity a nice cathedral head can. You will make nearly the same peak rwhp but more power everywhere else.

lemons12

iTrader: (71)

Why so much motor for these goals?

What all comes with the 6.0?

lemons12

iTrader: (71)

Lol one more post..

I don't know if I would blow 3k+ bucks on forging a motor for 475ish rwhp.. Especially if you buy a good motor.

Do remember l92/ls3 heads don't like the traditional cam specs.. They don't like a lot of over lap and like a 7-9* split.

69Z28X11

Thanks for the help guys. Just about the 6.0 motor. I also had a friend check it out yesterday. No tapping and no smoking. He can't remember what intake was on it. The motor is in a wrecked van(hit from behind). Close to a hundred thousand miles. So I will be selling this motor(block, stock cam, crank, rods, pistons, 98 5.7 heads, 2001 5.7 heads, oil pump and pan). What should I ask for it? The motor and heads are at the machine shop getting cleaned and checked. So I move my questions to the 6.0 motor. Would stroking this motor make more hps or can you make the hps i am looking for with a set of heads, cam, and intake?

69Z28X11

Forgot to add that everything from the trans forward comes with the 6.0.

1lejohn

iTrader: (9)

You can make your goal either way. Increasing the 6.0 to a 402 or 408 would be better but your going to have to spend more cash. The stock bttm ends on these motors are good to around 400-500HP. The rod bolts and pistons are the weak link, the cranks are good to 700+

I would get a custom cam any way that you go. I used FTI( Ed Curtis). The fast works well on cath heads, not so on the rect. heads (92, LS3's).

On the valve train stock lifters are ok, rebuild the stock rockers, and buy quality valve springs and valves.

If you could get a deal on used aftermarket heads that would be good. The 6.0 heads aren't the best for performence. They have large chambers, but are designed after the LS6 head.

There are some disagreements on how well the GM rect port heads work. They are a good buy and IMOP the work well.

69Z28X11

Thanks again John. Would you consider getting a good set of H beam rods or would some ARP bolts? The reason I was planning on going with the L92 heads was because a friend is making close to 800 hp with them. What intake would you consider rather than the Fast intake. I just can't see paying that much for an intake right now. As for the cam, I will be going with one from Comp cams as I can get a discount from them. What kind of numbers can you expect form the stock crank, better pistons, bigger cam, LS3 intake, L92 heads? Would this get me close to range I'm wanting to get to?

WS6SP33D

iTrader: (2)

If im not mistaken for l92 heads you would need a 4" bore 4"stroke. Intake wise i would say it is really hard to beat and ls6 for the price and the performance. I would also keep very much in mmind an ls1 stroked to 383 for some big power. JMO. Good luck with the build

69Z28X11

WS were are talking about the 6.0 now.

MrDavid

iTrader: (11)

Are you talking about a LS1? There are plenty of guys who have pushed their stock LS1/6 beyond 700whp and haven't bombed their engines. SpeedInc made around 1400hp out of a TT forged engine with a stock LS crank over 2 years ago.

Do some looking around in the boosted forums and you'll find that a stock bottom end LS can handle a LOT of power as long as you have a spot on tune and don't skimp on the fuel system.

I don't want to make a claim without giving you some evidence to back it up either.

http://forums.corvetteforum.com/c5-f...hortblock.html

1lejohn

iTrader: (9)

Yea they did it with aftermarket pistons and rods like I said the cranks are good for 700+++ Why does every one quote shop cars and not there own H.mmm We bent a Callies crank on spray making mid 700's. It was after 3yrs of racing though. The Calllies rods from that motor are in the 416 today.

I know Hot Rod just did a boosted 4.8 and made insane power 1000- 1200 ? on a stock bttm end. So every body should do it right. If you plan on racing it they won't last.