stock head modification
Thread Starter
Safety Car
Joined: Jun 2004
Posts: 4,769
Likes: 15
From: Lovin Life Oh
stock head modification
if i bought a set of stock ls1 heads and ported polished and milled 30 thousandths and put this on a nearly stock car what could i hope to gain?
are modified stock heads a bad idea?
would i be better off putting different valves springs and retainers?
are modified stock heads a bad idea?
would i be better off putting different valves springs and retainers?
Drifting
Joined: Sep 2002
Posts: 1,265
Likes: 0
From: Austin Texas
Re: stock head modification (98vert6spd)
i am in the process in trying almost the same thing,
I have FLP full length headers, LS6 instake, UD pulley, vararam intake, I am adding the LS6 intake, MTI stage 2E heads with a 04 Z06 cam
I am hoping for 400 rwhp with a 6-spd.
I am wondering if anyone has done this b4?
I have FLP full length headers, LS6 instake, UD pulley, vararam intake, I am adding the LS6 intake, MTI stage 2E heads with a 04 Z06 cam
I am hoping for 400 rwhp with a 6-spd.
I am wondering if anyone has done this b4?
Burning Brakes
Joined: Dec 2001
Posts: 1,190
Likes: 0
From: Jonestown, TEXAS
Re: stock head modification (98vert6spd)
if i bought a set of stock ls1 heads and ported polished and milled 30 thousandths and put this on a nearly stock car what could i hope to gain?
are modified stock heads a bad idea?
would i be better off putting different valves springs and retainers?
are modified stock heads a bad idea?
would i be better off putting different valves springs and retainers?
Thread Starter
Safety Car
Joined: Jun 2004
Posts: 4,769
Likes: 15
From: Lovin Life Oh
Re: stock head modification (dahoof)
if i were to have a set of stock heads of the car and time was no option because i had a set of heads still in the car what would you do with the heads to get the biggest bang for your buck?
mill?
different valves?
port polish?
mill?
different valves?
port polish?
Advanced
Joined: Mar 2004
Posts: 82
Likes: 0
From: fremont ca
Re: stock head modification (dahoof)
It depends, on how much over stock the heads flow and the ability of the exhaust to handle the increase gas's flow.
Assuming that there were no intake flow limits. Maybe 20 HP, if the head flowed as will as a LS6 and 5 to 10hp for the increase in compression
Assuming that there were no intake flow limits. Maybe 20 HP, if the head flowed as will as a LS6 and 5 to 10hp for the increase in compression
Drifting
Joined: Apr 2001
Posts: 1,779
Likes: 6
From: LOS ANGELES CA.
Re: stock head modification (98vert6spd)
I am not sure,but someone in the know may be able to contribute to this thread.I believe if you mill the heads,you have to remove an equal amount from the intake manifold.I read this article in Hot Rod Magazine a while back,but I don't know if it is the Gospel.I would look into that as it could cause problems down the line when the car doesn't run right due to manifold leaks. 
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