L92 heads for 5.7 LS1?
08-07-2009, 06:58 PM
#4
valves are too large. it wont fit... if you want an awsome engine get a 6.0 or larger and use those heads, i personaly got a 6.2 with those heads.. its amazing
you can find a iron 6.0 from a junkyard with low miles for cheap, throw away the heads and just use the bottom end..
btw not trying to be an ***. but i just did a search and i found a thread with the exact same questions. with all your questions answered... it took about, 30 seconds to find all this out.
you can find a iron 6.0 from a junkyard with low miles for cheap, throw away the heads and just use the bottom end..
btw not trying to be an ***. but i just did a search and i found a thread with the exact same questions. with all your questions answered... it took about, 30 seconds to find all this out.
08-07-2009, 07:02 PM
#7
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he justs wants good racing performance to go with his lingenfelter GT1 cam i think...and he wants and even top and and low end gain..But on a low budget
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09-28-2009, 01:09 PM
#9
I hate to beat this to death, but is the only thing stopping you from putting L92 heads on an LS1 block the larger intake valve?
If so, could you fix the problem by installing smaller intake valves and valve seats??
Is the combustion chamber too wide to run on a 3.9" bore?
-Dave
If so, could you fix the problem by installing smaller intake valves and valve seats??
Is the combustion chamber too wide to run on a 3.9" bore?
-Dave
09-28-2009, 02:57 PM
#10
They do not fit the 3.90 bore and even if they did fit those big L92 rectangular port heads will not be the best application for a for a 346 inch engine... you would better off with a good set of catherdal port heads that will have good flow as well a high air velocity that will promote good low end and mide range power too.
09-28-2009, 03:16 PM
#11
I want to get an LS9 or LSA blower, so cathedral port heads won't work for me.
L92 heads don't fit as cast. However, Mast Motorsports and RLD both make a "small bore" version, and I don't think it's a new casting. Unfortunately, they're both big bucks.
My plan is to start with a used set and have a machine shop change out the existing intake valve seats and valves with smaller seats and valves.
So that is why I am asking:
1) Is the intake valve the only thing keeping the L92 heads from fitting working on a 3.9" bore? (other than the intake manifold, rockers, etc)
2) Is the L92 combustion chamber too wide?
L92 heads don't fit as cast. However, Mast Motorsports and RLD both make a "small bore" version, and I don't think it's a new casting. Unfortunately, they're both big bucks.
My plan is to start with a used set and have a machine shop change out the existing intake valve seats and valves with smaller seats and valves.
So that is why I am asking:
1) Is the intake valve the only thing keeping the L92 heads from fitting working on a 3.9" bore? (other than the intake manifold, rockers, etc)
2) Is the L92 combustion chamber too wide?
They do not fit the 3.90 bore and even if they did fit those big L92 rectangular port heads will not be the best application for a for a 346 inch engine... you would better off with a good set of catherdal port heads that will have good flow as well a high air velocity that will promote good low end and mide range power too.
09-28-2009, 03:30 PM
#12
On the 5.7 the best head you will get from GM is the 243 casting. It is by far the best flowing head GM has ever put out. On a 5.7L engine with the right set up on a stock rotating assembly you'll see up to 500 hp. Now remember that the 5.7 you are restricted by cubes. On a 6L engine you can easily see 600+ hp with the 243's and the correct set up. TEA and Advanced Induction CHD are really good and proven to do great work with 243 casting heads.
09-28-2009, 03:58 PM
#13
I wish I could use cathedral port heads but the LS9/LSA blower is not compatible with them (as discussed above).
Nobody's reading my posts, just looking at the thread title. I think I'm going to start a new thread with my specific question...
Nobody's reading my posts, just looking at the thread title. I think I'm going to start a new thread with my specific question...
On the 5.7 the best head you will get from GM is the 243 casting. It is by far the best flowing head GM has ever put out. On a 5.7L engine with the right set up on a stock rotating assembly you'll see up to 500 hp. Now remember that the 5.7 you are restricted by cubes. On a 6L engine you can easily see 600+ hp with the 243's and the correct set up. TEA and Advanced Induction CHD are really good and proven to do great work with 243 casting heads.
09-28-2009, 10:24 PM
#14
The original question was not very specific, no mention of the LSA/LS9 blower. You do have an interesting situation and you may be right about starting another thread anyway, one that is more specific to what you are trying to accomplish.
09-29-2009, 12:15 PM
#15
Yea, I did kind of hijack it. It's a couple months old though. Basool got his answer and the thread was long forgotten. I thought maybe I could make some good out of an old "Does and L92 head fit on an LS1? No." thread, but it didn't work out.
Rather than start a new thread, I might just call Mast and/or RLD and ask them if they will sell me a set of the appropriate intake seats and valves to make a small bore L92 head. Then I can post a thread with answers, rather than questions!
Rather than start a new thread, I might just call Mast and/or RLD and ask them if they will sell me a set of the appropriate intake seats and valves to make a small bore L92 head. Then I can post a thread with answers, rather than questions!
Just a guess here, but it doesn't seem you are the friend that Basool started posting about, since he was looking for a budget head to go with a Lingenfelter GT1 cam. If I am wrong forgive me, but if you aren't said friend, you are hijacking someone else's thread who is getting good feedback.
The original question was not very specific, no mention of the LSA/LS9 blower. You do have an interesting situation and you may be right about starting another thread anyway, one that is more specific to what you are trying to accomplish.
The original question was not very specific, no mention of the LSA/LS9 blower. You do have an interesting situation and you may be right about starting another thread anyway, one that is more specific to what you are trying to accomplish.
