head casting info
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Joined: Sep 2007
Posts: 340
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From: bremerton
Car: 87 trans am
Engine: 5.7
Transmission: t-5
Axle/Gears: 9 bolt posi 3:27
head casting info
my heads are 14101081 can anyone give me the specs on those? what cc size and valves were used?
Joined: Jul 1999
Posts: 10,950
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From: Orange, SoCal
Car: 1990 Pontiac Trans Am
Engine: 355 TPI siamesed runners
Transmission: Tremec T56
Axle/Gears: 12-Bolt 3.73
Re: head casting info
Actually they're 87-92 heads. Valve sizes are correct 1.84"/1.50". And the combustion chamber size is 58cc's.
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From: Southern IL
Car: 88 GTA "Cocaine"
Engine: 350 tpi
Transmission: 700r4
Axle/Gears: 3.27
Re: head casting info
they are pretty good heads for a 305 and a nice punch for a 350 with bigger valves
get a cam under 470ish lift and put a set of z-28 springs in there with a good exsaust and intake and bam
you will blow it up in a week and build a 350
get a cam under 470ish lift and put a set of z-28 springs in there with a good exsaust and intake and bam
you will blow it up in a week and build a 350
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From: Putnam Valley, NY
Car: 1992 RS 6spd
Engine: Carbed 357c.i.
Transmission: Built T56
Axle/Gears: Soon to be Strange S60
Re: head casting info
Again he could do his research and work his heads into a 350 build without the bad timing of blowing his motor first though right?
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Member

Joined: Sep 2007
Posts: 340
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From: bremerton
Car: 87 trans am
Engine: 5.7
Transmission: t-5
Axle/Gears: 9 bolt posi 3:27
Re: head casting info
the ole lg4 has already been shot. she might be salvagable. however, i already have a 350 bored over 60 (the cylinders were that bad) that will be going in it place just was thinking about reworking my heads and adding them into the project instead of buying brand new ones
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Joined: Jul 1999
Posts: 17,262
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From: 51°N 114°W, 3500'
Car: 87 IROC L98
Engine: 588 Alcohol BBC
Transmission: Powerglide
Axle/Gears: Ford 9"/31 spline spool/4.86
Re: head casting info
There's more to heads than just combustion and valve size. Intake runner size determines how much air gets sucked into the engine. Restrictive ports means no air for bigger engines that need it.
There's only a small handful of 305 heads that can feed enough air into a 350+.
There's only a small handful of 305 heads that can feed enough air into a 350+.
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From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
Factory 305 heads that will feed a mild 350 well: 601, 416, 081. They have the same port sizes as iron L98 heads. 1.94" intake valves, and 1.60" exhaust valves if you like, with basic port/bowl clean-up, will easily support a 350 HP 350.
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From: Southern IL
Car: 88 GTA "Cocaine"
Engine: 350 tpi
Transmission: 700r4
Axle/Gears: 3.27
Re: head casting info
I have factory heads- I want a car lenth
I have factory runners-another
I have a factory intake-another
the lift on my cam is under .5-who cares
no stall-I am just gonna keep listin
2.77 gears
I will make you feel silly for spendin the money all the way to 160
oh buy the way for those of you who say my car hits the traps at 120 you will be lookin at my tailights
naturally asperated
just had to let it out
every once in a while a man has to let them hang
I have factory runners-another
I have a factory intake-another
the lift on my cam is under .5-who cares
no stall-I am just gonna keep listin
2.77 gears
I will make you feel silly for spendin the money all the way to 160
oh buy the way for those of you who say my car hits the traps at 120 you will be lookin at my tailights
naturally asperated
just had to let it out
every once in a while a man has to let them hang
Last edited by jamon8; Jun 30, 2008 at 06:04 PM.
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