434 Lsx lifting heads
434 Lsx lifting heads 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.
Thanks in advance.
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 ?
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.
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.
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.
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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.
Thanks in advance.
What kind of power it made?
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Verdad Gallardo 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.
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.
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.
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.
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.
Last edited by AES Racing; May 21, 2010 at 02:43 PM.
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.
Can you run a reducer?
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.
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.
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 
Last edited by helicoil; May 23, 2010 at 09:52 PM.