LT1 Head Specs?
Thread Starter
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Joined: Oct 2002
Posts: 9,067
Likes: 1
From: Saskatoon, SK, Canada
Car: '83 Z28, '07 Charger SRT8
Engine: 454ci, 6.1 Hemi
Transmission: TH350, A5
Axle/Gears: 2.73 posi, 3.06 posi
LT1 Head Specs?
Hey guys,
I've got a set of LT1 aluminum heads from a '97 Z28, and I'm just wondering about the stock specs on these heads? All I know is that they have ~170cc ports, D-port syle exhaust ports, and 53cc angle plug chambers.
What I'd like to know is how heavy the stock valve springs are? What are the heads limitted to as far as valve lift w/o machining the guides? Whats the stock valve sizes (don't have the tools handy to measure)?
BTW - I know these aren't a bolt-on to a Gen 1 sbc... this is a special project
I've got a set of LT1 aluminum heads from a '97 Z28, and I'm just wondering about the stock specs on these heads? All I know is that they have ~170cc ports, D-port syle exhaust ports, and 53cc angle plug chambers.
What I'd like to know is how heavy the stock valve springs are? What are the heads limitted to as far as valve lift w/o machining the guides? Whats the stock valve sizes (don't have the tools handy to measure)?
BTW - I know these aren't a bolt-on to a Gen 1 sbc... this is a special project
Joined: Jun 2005
Posts: 813
Likes: 0
From: Adrian, Mi
Car: 1989 Camaro
Engine: 350 but it's torn down right now.
Transmission: 700r4
Axle/Gears: I'm working on it,lol.
Re: LT1 Head Specs?
I don't know the weight of the valve springs, but the valves are 1.940 intake and 1.500 on the exhaust. Your aluminum heads should flow like this:
Intake Exhaust
0.050 42.0 30.0
0.100 72.0 53.0
0.200 129.0 101.0
0.300 180.0 136.0
0.400 213.0 155.0
0.500 214.0 165.0
0.600 215.0 171.0
Hope that helps!
P.S. That's at 28.0 in h20 drop
Intake Exhaust
0.050 42.0 30.0
0.100 72.0 53.0
0.200 129.0 101.0
0.300 180.0 136.0
0.400 213.0 155.0
0.500 214.0 165.0
0.600 215.0 171.0
Hope that helps!
P.S. That's at 28.0 in h20 drop
Last edited by iroczracer07; Jun 3, 2007 at 08:40 AM. Reason: forgot something
Thread Starter
TGO Supporter
Joined: Oct 2002
Posts: 9,067
Likes: 1
From: Saskatoon, SK, Canada
Car: '83 Z28, '07 Charger SRT8
Engine: 454ci, 6.1 Hemi
Transmission: TH350, A5
Axle/Gears: 2.73 posi, 3.06 posi
Re: LT1 Head Specs?
You don't happen to know the valve lift limit for a stock LT1 head do you?
Joined: Jul 1999
Posts: 10,950
Likes: 26
From: Orange, SoCal
Car: 1990 Pontiac Trans Am
Engine: 355 TPI siamesed runners
Transmission: Tremec T56
Axle/Gears: 12-Bolt 3.73
Re: LT1 Head Specs?
Yes, its only slightly better than our SBC heads, about .480-.490 lift.
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