SuddenPsycho 31

Hello,
Bran' Spankin' New Newbie here... (this forum at least)

Anyway, I have been researching a LS1 build up for a circle track car, but our rules require iron heads; we can run up to 750 DP carbs. So I am looking for flow numbers on the 99-01 gen III truck heads. I wish i could run some of the cool aluminum stuff, but i can't. Maybe magnetic paint LOL.
So, I want the 15 degree advantage, but I am hung on the heads.
ANY number would be great, flow at RPM's, raised runner info, or anyone making GOOD performance mods on the stock ones.

Thanks ahead for any info...
Brian

Tuf-Titan

I have set flowing 330cfm at 600 that Im working on right now.

jerry fife

Tuf titan...do you have any pics...I'm building one for a swap and have ported and polished them ....getting valve job done next week

G Atsma

Dude, that thread is 12 years old....

jerry fife

Realized that after I sent it....got my lq4 dirt cheap using flat top pistons that are floating pin...fit perfect....224/230 .604/609 115lsa cam...all the valve train upgrades...full header xpipe exhaust

A.R. Shale Targa

iTrader: (2)

G Atsma

Oh. Well that's different! Nevermind! lol

EuroKing

Hi,
I know this is an old thread, was wondering how you got on with the iron heads I am about to start a project motor and would like to run an LS1 in a sprint car rules also iron heads

EuroKing

If any one knows of some LS performance cast iron heads up for grabs I am interested

jerry fife

Euroking
I had a failure crack that rusted right at the valve seat on one of my iron heads...water jacket leak... I ended up going to junkyard and getting some aluminum 862 heads with much smaller combustion chamber and the engine is very snappy... I haven't dyno it yet but wow!
As for your sprint car the iron heads can be found in junkyards on 99-00 chev and gmc 2500hd 3500hd truck and vans very cheap

EuroKing

Thanks for that jerry fife, only snag is I am in Australia and non in our junk yards

jerry fife

Good luck down under Euroking

G Atsma

Cast iron heads only came on one engine here in the States- the 1999-2000 LQ4, which is a truck-only engine. All others are aluminum.
Need less to say, performance versions of these heads are about nonexistent.
Do the rules allow aluminum blocks? LS1's only came with aluminum blocks. The iron block engines only came in trucks, and the LS1 was never a truck engine.

EuroKing

Iron block and heads, but can get iron block easy enough, I found Brzezinski Racing Products do an aftermarket iron head but non in stock at the moment,

G Atsma

You mentioned it is an LS1. The LS1 was a 5.7L aluminum-ONLY block engine.
You actually mean the LM7 (5.3L), LQ4 or LQ9(both 6.0L) if we are discussing Gen III iron block engine.
As said, only the early (99-00) LQ4 came with iron heads. No other Gen III engine has them, and no GenIV engines have them.

EuroKing

Ok fair play, what I have been looking at is the hybrid SBC that has LS head bolt pattern and find the iron heads to suit, Brzezinski Racing Products had them advertised as LS iron heads