Cast iron (873) LS1 head flow??
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Teching In
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Cast iron (873) LS1 head flow?? 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
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
TECH Senior Member
Joined: Jun 2016
Posts: 22,298
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From: Central Cal.
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Teching In
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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
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
TECH Senior Member
Joined: Jun 2016
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From: Central Cal.
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.
Last edited by G Atsma; Nov 13, 2020 at 08:01 PM.
TECH Senior Member
Joined: Jun 2016
Posts: 22,298
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From: Central Cal.
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.
