Ive searched and cannot find much information

do ls9s have thicker decks? lsa thicker? i know they have the better metal alloy used. You guys thick they would be any good?

 

I could not find any concrete info on deck thickness, but I took the leap anyways.
They are MUCH nicer looking castings than the L92's and should be stronger due to the rotocast technique and a356-t6 material. How much stronger, thats the question of the day.
No track passes for me yet, but I have been beating the hell out of it on the street and am not moving any coolant at all.
FWIW my L92's moved about half a pint during the dyno tuning session.
That was at 12psi and only 737rwhp through a 4,500 stall th400.
For my goals of a few high 8's at 3,200lbs once in a while I think they will do fine.
The factory heads can hold power if the tune and fuel setup is good, but they will of course have a shorter life cycle than an aftermarket head with .750 decks.
I am hoping that E85 and minimal hot-lapping will help keep mine together,
for a while....
I say go for it, the heads are stupid cheap anyways....

Good luck !!!

Jim

 

Ive heard the lsa heads have a pretty damn thick deck. You did ls9 heads? Let me know what the deck thickness is on them!

 

I just got a set of LSA heads today. That what i plan on running dont know ho much boost i'll be able to run buyt shooting for 20 psi+ from a s475 with less than 8.5:1

 

I used LSA'a, but from what I have found out it seems that they are the same casting.
The LS9's get opened up for larger head bolts and have different valve seats that play nicely with the titanium valves.
Thanks to Bruce (See5 on here) for the info on these cool heads.
He usually has a set of take offs for sale, shoot him a PM.

Jim

 

is there any more input ??

 

Ls9's do have thicker deck and a better alloy casting than the standard heads we use. What more info are you looking for?

 

there are getting to be more and more sets out there so you will begin to hear on how they stand up with alot of boost/power

i have WCCH LSA's..... great casting compared to my old regular L92's

run great, but i have not had to push them powerwise since i am so light

 

I plan on pushing mine this year until something gives.

refreshed 408 over the winter, VA speed cam, Garrett 88mm, and these heads. It'll go 8's or hurt something this year.

 

if you go the LSX block you can run the new LSX LS9 6 bolt heads, much better sealing and then you can also if you wish run bigger cubes maybe 427-440 cube max if running lots of boost.

thompson automotive have made an lsx427 with lsx ls9 heads and ls9 supercharger on it made 710hp with a very milt tune/cam and stock intake.
http://www.thomsonautomotive.com/?page=youtube.cfm

[youtube]66R9i09NJfs[/youtube]

 

let us know how it goes!

you are using LSA's or LS9's?

 

Ls9 heads. Just waiting to get pipes coated and then we are headed to the track.

 

I have the WCCH LSA's as well and AES is supposed to ship out my new 410'' LSX short block this week I should have it running in a couple of weeks at 20+ psi. I did have my heads and block changed over to run a 1/2'' ARP studs once tuned I intend to spin the F1R to max rpm so we will see what they will take!

 

What intake are you guys running with the ls9 and lsa's? Would i see a gain at 10-12lbs for pump gas driving over as cast 317's with a fast 92 intake?

 

I'm using the L92 Vic Jr. Certainly not the best in terms of airflow distribution, and was on the fence about going to a Super Victor, but it wasnt in the cards for this year.

 

I am running the L76/Ls3 intake


Can't wait to see how they work out for you dave!

 

I plan on running stock LSA's on my 410" AES LSX also, but with an LS3 intake and GT47 turbo. Cant wait to see how your motors do with them, as mine is still a few weeks out.

 

Yea i was thinking to run the stock LS3 intake to save a few bucks and also stay composite if i made the switch. Anyone think there's power to be gained on low boost with the lsa's vs 317's? With the 75cc chambers as cast, that would be enough to get me a tad bit below 10:1 cr also.

 

I am running a Precision metal fab sheet metal intake. The chambers are 72cc stock WCCH had to machine my chambers to get 75cc

 

Your question is basically saying "Which is better, #317's or L92's?"


Essentially that's what a LSA head is, minus better alloy, moderately better deck, and better valves. I think there's definitely a power increase to be had in the port design alone, and the added cr drop isn't a bad thing either if that's what you are looking for.