BlackWS666

iTrader: (31)

Yes please let us know the results!!! Im thinking at this point unless you tell me some crazy crap im just gonna stick to a cathedral.

Mightymike2000ss

iTrader: (4)

automagic seems to be doing just fine running cathedrals. I think on your boost levels you are putting out more power than he is though lol

Louis

iTrader: (7)

I have some pressing work to get done for next weekend, which takes priority over science projects, but we shall resume asap, Mid week Id assume.

miatainthe10s

We'll take it when ever we can get it. Lol

Louis

iTrader: (7)

Got everything cut, Ill post pics sometime soon.


241 Couldnt find a 317 in my trash pile.... I can cut one as soon as I get one. thought I had some, but I guess the scrap man got them first!

1. material was OK
2. Deck was roughly .400 and .430 in the two spots I cut
3. Bosses for head bolts were not re-inforced

821 LS3 OEM Vette casting

• Material machined very easily. Almost too easy. It was the softest of the bunch.
• Deck was .400 everywhere I measured it.
• No bolt reinforcements.

8452 OEM LS7 casting

• Material was nice. 2nd toughest of the group of 4.
• deck was again ~ .400
• bolt reinforcements present!

863 LSA casting

• Deck thickness was .400-.430
• material was the toughest of the bunch! I had to change tools and actually use a good end mill
• bolt holes have reinforcement ribs.
• area above the exhaust side of the chamber has a different appearance compared to LS1 241 casting.

In summary:

• LSA heads had the best material
• virtually no difference in deck thickness
• LS7 and LSA contain ribs around the bolt holes in the water jackets
• LS3 cut like butter, easier than the 241.

Pics coming soon.

Louis

Louis

iTrader: (7)

My next choice would be a ZR1/LS9 head to cut apart, but they are fairly costly.

At that point, Id recommend going 6 bolt.

dudeman

iTrader: (43)

louis, thanks for taking time to do this. lots of good info here.

PRAY HRD

iTrader: (119)

thank you also Louis!! That confirms what i was hoping.

BlackWS666

iTrader: (31)

Louis i appreciate you taking the time to do that. Get a handful more cut open and thats some sticky material!!

9sectruck

iTrader: (9)

did you have chance to cut a 823 head?
or, are them heads the same as the 821?

eb02z06

iTrader: (18)

Wouldnt they be the same as the LSA?

xxrillixx

iTrader: (118)

Any updates on this? I was all gung-ho for going to a ls3 top end on my 408 build for the turbo camaro... now im starting second guess it. I had hoped to used the 823/821 heads, but if you guys are having issues with the materials being weak what do you recommend?

Im currently forged ls1, ls6 intake, z06 cam, 317s, 20psi rear mount 72mm, 6 speed. 600hp/700trq

I have a lq4 sitting in the garage i wanted to make a 408, 823s, ls3 intake, mild cam, same turbo till i can upgrade to a 76/80.

Any advise? Its a daily driver car, so not looking to go too crazy just want to pick up the down low power the current setup is lacking... and hopefully an overall increase of my curve.

68 SS

iTrader: (23)

LSA heads will get you where you want to go and hold up lots of us running them and I have not heard of any issues or failures.

eb02z06

iTrader: (18)

Some foks claim the wing in the intake port stalls the head but I find that really, really hard to beleive.

If it did why the hell did GM put it there? Especially on a boosted aplication?

There are some things the flow bench won't tell you-for the others just turn up the boost.

I'm damn near tempted to pull my TFS 245's to try out as set of these heads.

tim99ws6

iTrader: (31)

Wanna trade?

Raptor_WS6

iTrader: (23)

What's the cc on lsa heads

dudeman

iTrader: (43)

i use the 823 casting heads. i use a garret budget gt91 and im at 18psi. car has been 8.93@157.

eb02z06

iTrader: (18)

I heard 68-70cc

rotary1307cc

iTrader: (5)

I know on Richard's program with minimum deck milling, just enough to give a good deck surface

I was around 74cc on my lsa set, cant remember how much less the stock chamber was

BlackWS666

iTrader: (31)

I pulled the trigger on the LS9 heads. Wont be able to do any testing until spring though...