turboed2000

iTrader: (4)

I have a LSX 434 with 245cc Trickflow 6-bolt heads with studs. They are not 1/2". It has cometic gaskets. It has a gt4788 and only 19psi it is pushing water. Any sugestions would be great. I have never had an issue with 4 bolt heads and have ran alot more boost.

Thanks in advance.

1904gto

iTrader: (4)

re torque them anf u sure u torqued them to what they suppose to be?

turboed2000

iTrader: (4)

Yes they are torqued to the right specs. I called LME again today to make sure.

slow trap

iTrader: (22)

no actual first hand experience so take my opinion with a grain of salt but @ 19 psi with that 98 you are making some serious power,correct ? may have to oring or step up to 1/2 inch studs or maybe both. what studs are you using ?

87silverbullet

iTrader: (11)

I don't think 1/2 studs are going to be needed with this being a 6 bolt setup.
O-ringing would be a good choice at that boost level but there have been many guys who have run that boost level without o-ringing. What is your tune like? Where is your timing?
I have heard Cometic's have a hard time sealing if the surfaces are not milled to a certain smoothness.

Ls2formula had some issues with his TFS 245's cracking, maybe you are having the same issue.

Phil99vette

iTrader: (11)

6 BOLT, If you plan on pushing it hard, you need to do 1/2" studs on the 4 corners, 3/8" studs on the 6 and 12, copper gasket with dual o-rings. You wont push water ever again.

FreakChevy

Interesting!

What kind of power it made?

turboed2000

iTrader: (4)

Thanks for all the good replies. Phill where do I get these head gaskets from. I will have the block and heads O-ringed.

through a glide and a 9" it made 1632rwhp

Phil99vette

iTrader: (11)

Your going to have to get a shop to do it. Virginia speed is my choice. We made 1105rwhp at 13psi through a glide and a 9" and routinely run 36-40# of boost without pushing a drop. I would send the **** to Shawn and be done with it. The shop needs to have a 5 axis cnc to perform the swap correctly.

helicoil

iTrader: (104)

I have cut O-ring grooves in blocks and heads using a boring bar and a special cutter which costs about 85.00. Check with your local machine shops, you might be surprised. A good machinist can handle this without a 5 axis machine.

Phil99vette

iTrader: (11)

Your right, you can have someone do it with a special cutter. My first setup had it done with a "special cutter" and comparing the "special cutter" vs a 5 axis CNC, there was no comparison. The special cutters does not have precision uniform depths, which leads to high and low spots on the o-ring surface which is going to be your leaking point.

We used a 5 axis CNC to deck the block from the first o-ring setup. Our 1st o-ring was supposed to be .020 depth, it took .030 to get it completely out since some of the groove had inconsistent depths.

I've been there done that and am speaking from experience.

I can hone a block with a drill in my garage, don't make it the best way to do it.

spoooled

iTrader: (1)

Would Shawn just do the double O-rings to block and heads or does he need to assemble the long block?

Phil99vette

iTrader: (11)

AFAIK, he needs your block/heads and I think he has said he will do it without assembling the block.

AES Racing

iTrader: (6)

I think that turbo is too small, backpressure? GT4718, what A/R what size DP?

1632rwhp, atleast 1800 engine hp, take atleast 140lbs/min of airflow to get that number which is out
of the efficiency.
http://www.turbobygarrett.com/turbob...0-7,8,9,10.pdf

a 434ci engine can spool 2 88mm turbochargers.

ATVracr

iTrader: (5)

Take some timing out.

racer7088

Yeah that's what I was thinking! Shouldn't really have any issues with that setup at that power at all.

turboed2000

iTrader: (4)

Thanks for all the input. The exhaust ar. is a 132. This is the largest turbo I can run in my class. I am only running 18* of timing and 19psi. I am sure it is not timing related. The place that built the motor has a 5 axis machine and said it will be done by thurs day.

Gordon0652

iTrader: (4)

LME does awesome work! Let us know how it works out for you!!!
Can we have any specs on the engine? I am intrested... What computer system are you using?

AES Racing

iTrader: (6)

1632rwhp is impressive for a single 4718, i'd be interested if it could be outperformed with a PTE HP4788 or pro mod 88, it would be significantly ligher turbo to begin with.

Can you run a reducer?

helicoil

iTrader: (104)

O.K. Ace, whatever you say, just giving the OP an alternative. I guess since your speaking from 'experience' you must be right. I'm sorry I'll go back into my hole and try to re-think how I have been doing this procedure wrong all these years now that I have learned something NEW. I guess the next thing your gonna tell me is that you can't put sleeves in a block without a 5-axis CNC because you can't cut the register close enough. I might as well just get out of doing engine work all together until I get a 5-axis. I'll never put another O-ring groove in now. BTW, I am on my fourth or so cutter.....but it can't be done. The key is to know what you are doing, as with anything. How did everybody do it before, the less than 25% in the trade who own a 5 axis CNC, when they didn't have a 5 axis CNC? O-ringing heads and blocks must be NEW technology.....LS1Tech technology..... maybe