Lifting heads at 19 psi?

[pl4yboy]

I just love net Sayers that don't have actual knowledge on subject to chime in.
some ppl are pushing good power with ls9 ls3 l92 lsa heads and aren't having the issues others claim

Regardless of what you did, they are still notorious for pushing water more easily than the other LS heads. Just because some people don't have the issues, doesn't mean everyone is that lucky. I'm sure good tuning has a lot to do with it, but they still push water more easily. Facts are facts.

[molitor]

Warhawk 15dg, FTW

[George C]

are you a tuner? are you a builder? do you have any actual turbo experience with them?


point being answers are NO, any head on market can push coolant in the wrong hands. Look at Kurt last he reported he was using the L92 heads and over 1100 rwhp and hasnt reported pushing water. and the deck thickness difference between the 317s and Ls3 bunch is roughly 1/16th of an inch that isnt enough to really create big issues. its rumors ppl picked up and followed. Just like how if you push over 600 HP in a stock motor it will blow, just like you need a forged motor to make 800 rwhp and all that bullsh1t. Tuning and keeping the motor cool along with good fuel is key to keeping heads down. If youre pushing over 1k then you may start thinking other sources
6 bolt heads with distorting over sized head studs will still push water, its just how much is it going to push between passes

Regardless of what you did, they are still notorious for pushing water more easily than the other LS heads. Just because some people don't have the issues, doesn't mean everyone is that lucky. I'm sure good tuning has a lot to do with it, but they still push water more easily. Facts are facts.

[pl4yboy]

are you a tuner? are you a builder? do you have any actual turbo experience with them?


point being answers are NO, any head on market can push coolant in the wrong hands. Look at Kurt last he reported he was using the L92 heads and over 1100 rwhp and hasnt reported pushing water. and the deck thickness difference between the 317s and Ls3 bunch is roughly 1/16th of an inch that isnt enough to really create big issues. its rumors ppl picked up and followed. Just like how if you push over 600 HP in a stock motor it will blow, just like you need a forged motor to make 800 rwhp and all that bullsh1t. Tuning and keeping the motor cool along with good fuel is key to keeping heads down. If youre pushing over 1k then you may start thinking other sources
6 bolt heads with distorting over sized head studs will still push water, its just how much is it going to push between passes

They still push water more easily. That was the debate. End of discusssion... or at least my side of it.

[RedHeartbeat]

Put 1/2"-13 studs in the block and machine the heads for them. The 11mm-2pitch thread is .0769 and the 1/2-13 is .0787 spaced. This is a very common mod engine builders are doing to secure the heads on really HP engines.

[George C]

funny that this is supposly needed when you have ppl using stock size hardware making big power without over sized studs. Fire rings are a better mod then oversized head distorting studs

Put 1/2"-13 studs in the block and machine the heads for them. The 11mm-2pitch thread is .0769 and the 1/2-13 is .0787 spaced. This is a very common mod engine builders are doing to secure the heads on really HP engines.

[Trick1]

I have a friend running a 408 with L92 heads. He is running an F1 supercharger in a 57 chevy. He us running 19 psi and keeps lifting the right bank head? The block is fully studded also. He was wondering what heads had a thicker deck to keep this from happening?

10 or 19.
Title says, 10
typing says 19
Pull back 1 lbs. and call it a day. j/k

If the heads are off, check both block and heads for flatness. Flatness with the proper cut on both block and heads for the style of gasket using is very important. If they arent flat to begin with the will not be flat later.
Other then that, check the tune, but others have already said that.

I will be running a set of L92's. Just need some more time to get it in the truck.
Attachment 4134

[RedHeartbeat]

Why do I bother?

[04chase]

properly drilled and tapped block thread and drilled heads will not distort if done properly . with that said its not needed 90% of the time . you can get crazy with it if you really wanted and run o ring's. just not needed for most.

[George C]

have you read some of the posts by phill99vette and Kurt urban? Then theres that swedish fellow. that swedish fellow is near 1500 rwhp on 317s with fire rings and standard size head studs. alot are saying the oversized studs arent needed and arent helping as much as a stronger strenght stock size stud does.however if its working for you congrats.
as for needed for most...a stock motor can hold 7-800 where as forged motors fail at same point, so whats really needed for MOST ppl?

properly drilled and tapped block thread and drilled heads will not distort if done properly . with that said its not needed 90% of the time . you can get crazy with it if you really wanted and run o ring's. just not needed for most.