i read in a manual that the 88 SC's
stock lift is .237"/253" tell me this
isnt so........ wasnt labled as duration either
-------------------------
SPEED

 

why do you think our cars have to shift at 4500, and have only 170 hp stock? sorry, its true. why else would so many want to get their hands on an lt1 cam.

 

I thought it was around .350/.350
.250/.250 is sick. maybe that year is .250/.250 because the TBI had only 150HP that year insted of the normal 170.

------------------
-Tas
'89 Formula WS-6

305, TBI, auto, 14x3 chrome flat based open element with K&N, Milodon 160* thermo, functional Formula hood, cross-flow Flowmaster, '99z28 rear pipes and tips....

To be installed eventually far far far into the future: Yours if the price is right and I don't have to ship :
Hooker 1-5/8" 50 state legal headers, Dynomax 3" I pipe (PN 44063 and 43248), Catco 3" cat, and injector spacer.

Super GRK_Taz World
F-Body Dual Exaust
EFI & Intake Options
AOL IM: superGRtaz

 

.250 x 1.5 (rocker ratio) = .375" lift
Still pathetic any way you look at it.
I don't know if that number is right and I don't care, all I know is the Lo3 cam is a pathetic roller cam. A complete waste of good steel.

------------------
, Jon (350 TBI!)
91 Red My website

 

PLEASE don't tell me that we have to go through the horsepower rating game, Tas. This was just beat to heck on the theorical board. One guy finally had to scan a pontiac ad from 1989 CLEARLY STATING that the 89 TBI put out 170 hp, and 255 ft-lbs.
And, no, the 88 was no different.


------------------
No guts, no glory.

 

I just read this on the GM-TBI list:

Subject: L03 Cam Specs


After a little searching and calling parts departments I can
definitely say for sure that the camshaft in my 91 civi 305 is
Model Number 10088155
.05" Duration 179/194
1.5:1 Lift .350/.384
1.6:1 Lift .373/.410
Lobe Sep. 109deg
It put out 170hp @ 4000RPM & 255ft-lbs @ 2400RPM.

 

I thought '88 TBI was 150? like the LG4. no?

------------------
-Tas
'89 Formula WS-6

305, TBI, auto, 14x3 chrome flat based open element with K&N, Milodon 160* thermo, functional Formula hood, cross-flow Flowmaster, '99z28 rear pipes and tips....

To be installed eventually far far far into the future: Yours if the price is right and I don't have to ship :
Hooker 1-5/8" 50 state legal headers, Dynomax 3" I pipe (PN 44063 and 43248), Catco 3" cat, and injector spacer.

Super GRK_Taz World
F-Body Dual Exaust
EFI & Intake Options
AOL IM: superGRtaz

 

Moderators?

------------------
No guts, no glory.

 

all the throttle body engines put out 170hp @ 4000 and 255tq @ 2400 period. The L03 made more horsepower than the LG4 because of fuel injection and serpentine belts.

 

That's why we must all utilize what is known as the great LT1 camshaft. Then we shall live in happiness and more horsepower. =D

------------------
1992 Camaro RS (Auto) 5.0L TBI
-
Performance mods
NOS (125 HP shot)
Dynomax cat-back exhaust
Hedman headers
K & N open element/ X-Stream lid
MSD 6A ignition
MSD 8.5mm plug wires
LT1 camshaft
Soon to be installed:
Edelbrock intake manifold
B & M 2400 RPM stall torque converter
Trans Go shift kit
World Products Torquer heads

Audio
Sony Xplod CDX-M610 head unit
Pioneer 2-way 4x6 front speakers
Pioneer 3-way 6x9 rear speakers
12 inch Pioneer VCCS PRO subwoofer
QLogic sealed box
Kicker ZR360 amplifier
Lightning Audio 1 farad capacitor

Other
Macewen White Faced Gauges/Shift overlay
A-pillar gauges (Phantom oil pressure, Air/Fuel)
180* thermostat
Window Tint

 

The LG4 had different ratings depending on the year. I think it started out around 140hp and ended up at 165hp and 250ft-lbs.

 

The LG4 made less hp not only because of carb/efi, belt system, but because of the lower compression. It was around 8.6 and the Lo3 was at 9.5 with flat top pistons. This is why the Lo3 is a better bottom end than the Lg4 but the Lg4 had a cheaper and easy to tune carb (no need for eproms). The Lo3 had a roller cam setup and the Lg4 was flat but I think in 86 and 87 they got roller. I'm not sure and I don't really care but I just thought I'd through out those other important differences.

[This message has been edited by JPrevost (edited September 28, 2001).]

 

In '85 the LG4 got flat top pistons and 9.5 to 1 too.

 

Just for your info the LO3 out of my 89 RS has dished pistons. So did my 89 LO5 engine. I don't know about my 91 LO3 yet.

 

Okay, I think I was jipped. My LO3 has 9.3:1 compression. At least that's what my manual says.

 

L03's don't have dished pistons. '85 LG4's don't have them either. Are you sure you're not talking about the vavle reliefs?

88 and 89 had 9.5 to 1, in 90 or 91 they started using a different head gasket and the ratio changed to 9.3 to 1.

 

it was the '87 LG4 that got the roller

 

Headgaskets!? That makes that big of a difference in compression? Hmm.. anybody happen to have the part number of those 9.5:1 head gaskets?

 

.2 isn't really a big difference in compression. There are some head gaskets out there that are suppossed to be extra thin to raise the compression ratio more than that but they are usually expensive and probably not worth the few extra points.

Maybe a head gasket for an '85 to '89 305 would get you the one with the thinner thickness, but I bet that all the aftermarket gaskets and GM gaskets are all the same thickness now, it's hard to tell what ratio they would yield.

 

Keith5, yes they are dished pistons with four valves reliefs. I also have an 83 L69 engine torn down and it has true flat tops with four valve reliefs.

 

I have an 85 L69 and a LG4. They do not have dished pistons. So quit arguing about this stupid stuff. Here is a pic of the L69. http://pages.preferred.com/~bulfrawg/pics/Dcp_0102a.jpg
Since in 85 the L69 and LG4 used the same short block they both have the flat tops. Also i can take pics of my LG4 that is taken apart, if you still believe they are dished. I also have taken apart a 91 LO3. It also had flat tops.

------------------
1985 TransAm BLK/GLD Stock
1985 TransAm BLK/BLK
305HO (Its finally in) 5-speed, 3.27 posi, WS6, power everthing.
http://www.geocities.com/bullfrawgs